Littelfuse Indicator TM Fuses LLSRK_ID ■ Class RK1 ■ 600 VAC ■ Dual-Element, Time-Delay ■ 1/10-600 Amperes see pages 10-11 FLNR_ID/FLSR_ID ■ Class RK5 ■ 250/600 VAC ■ Dual-Element, Time-Delay ■ 1/10-600 Amperes see pages 28-30 IDSR ■ Class RK5 ■ 600 V AC/DC ■ Dual-Element, Time-Delay ■ 1/10-600 Amperes see pages 20-21 JTD_ID ■ Class J ■ 600 VAC ■ Time-Delay ■ 8/10-600 Amperes see pages 15-17 313_ID ■ Electronic 3AG ■ 125/32 VAC ■ Slo-Blo ® ■ 1/2-10 Amperes see page 54 5 During an overload or short-circuit situation, the Indicator TM fuse will promptly notify you of an open circuit. Using patented Littelfuse technology, the Indicator TM fuse’s window changes from clear to dark. Once blown, there is absolutely no current through the fuse. GOOD BLOWN
IDSR■ Class RK5■ 600 V AC/DC ■ Dual-Element, Time-Delay ■ 1/10-600 Amperes
see pages 20-21
JTD_ID■ Class J■ 600 VAC ■ Time-Delay ■ 8/10-600 Amperes
see pages 15-17
313_ID■ Electronic 3AG■ 125/32 VAC ■ Slo-Blo®
■ 1/2-10 Amperes
see page 54
5
During an overload or short-circuit situation, the IndicatorTM fuse will promptly notify you of an open circuit. Using patented Littelfuse technology, the IndicatorTM fuse’s windowchanges from clear to dark. Once blown, thereis absolutely no current through the fuse.
GOOD
BLOWN
6
The new Littelfuse POWR-PRO™ System of fuses gives you all the fuses you need for complete circuit protection coverage while reducing inventory and controllingcosts.
The LittelfusePOWR-PRO®
System of fuses gives you all the fuses you needfor complete circuit protec-tion coveragewhile reducinginventory andcontrollingcosts.
The LittelfusePOWR-PRO®
System of fuses gives you all the fuses you needfor complete circuit protec-tion coveragewhile reducinginventory andcontrollingcosts.
Littelfuse POWR-PRO® System
■ The only UL Listed 600 voltAC/DC fuses 1/10 through2000 amperes.
■ Non-electrical blown fuseindication in the cost effective IDSR series.
COLOR COORDINATED FOR EASE OF IDENTITY AND REPLACEMENT
Green labeled fuses provide all the inventory you need for:
■ Superior current limitationfrom 1/10 – 6000 amperes.
■ Type II “No Damage” coordi-nation with NEMA and IECmotor circuits.
■ Blown fuse indication(LLSRK_ID and JTD_ID).
■ Compact protection for motorcircuits (JTD, JTD_ID, andCCMR).
■ 300,000 AIR to meet futuretrends toward higher avail-able short circuit currents.
The POWR-PRO® System will:■ Provide superior current limiting protection with
innovative, tested designs to prevent or reduce electricalsystem damage.
■ Reduce inventory by standardizing system protection.
■ Provide visual blown fuse indication with LLSRK_ID,JTD_ID, and IDSR IndicatorTM fuses.
■ Reduce fuse replacement downtime with simple colorcoded fuse labels.
See for yourself why the POWR-PRO® System gives you the widest range of circuit protection available todaywhen compared to other systems.
UL Fuse Class POWR-PRO® Low Peak System 2000
Class L KLPC KRPC A4BQClass RK1 LLNRK/LLSRK_ID LPNRK/LPSRK A2DR/A6DRClass J JTD/JTD_ID LPJ AJTClass CC CCMR (2/10–60) LPCC (1/2–30) ATDR (0–30)
Class RK5 IDSR — —Class L LDC — —
Red labeled fuses provide all the inventory you need for:
7
KLPC Series POWR-PRO® Class L Fuses600 VAC ■ Time-Delay ■ 200 – 6000 Amperes
Example part number (series & amperage): KLPC 1000
KLPC series POWR-PRO® fuses provide ideal overcurrentprotection for circuits from 200 through 6000 amperes. KLPCseries POWR-PRO® fuses specification-grade constructionand performance meet or exceed the most stringent projectspecifications: 99.9% pure silver links, silver-plated copperend bells, glass-reinforced melamine bodies, O-ring sealsbetween body and end bells, and granular quartz fillers.
KLPC series POWR-PRO® fuses are the only UL listed ClassL fuses that provide a minimum of ten seconds time delay at500% rated current and are also as current limiting as thefastest Class L fuse on the market. On average, the peak let-through currents of KLPC series fuses are 10% less than anyother “time-delay” Class L fuse.
APPLICATIONSService switches
Switchboard mains and feeders
Bolted pressure contact switches
Motor control center mains
Large motor branch circuits
UL Listed series-rated protection for molded case circuitbreaker panelboards and loadcenters. (See panelboardmanufacturers’ literature for recommended fuse rating.)
Primary and secondary protection for transformers
Protection of power circuit breakers
FEATURES AND BENEFITS■ Eliminate unnecessary downtime — KLPC POWR-
PRO® series fuses’ time delay withstands system surgesand keeps your circuits in service.
■ Best protection for system components — Maximumcurrent limitation means less equipment and system damage when short circuits occur. Reduced damagemeans that electrical service can be restored quickly, reducing costly downtime, and often permitting equipmentrepair rather than replacement.
■ Coordinates with other system components — KLPCseries fuses provide maximum coordination with fuses andcircuit breakers both on the line and load side of the fuses.See the Fuseology section of this catalog for additionalinformation.
■ Eliminate need to oversize fuses — This may permit theuse of smaller less expensive switches, and, since thelower rated fuses are more current limiting, equipmentreceives even better protection.
■ 300kA Interrupting Rating — Littelfuse self-certified to300,000 amperes as standard. Meets future trend towardshigher available short circuit currents.
8
KLPC Series POWR-PRO® Class L Fuses600 VAC ■ Time-Delay ■ 200 – 6000 Amperes
Example part number (series & amperage): LLSRK30ID
NOTE: All fuses rated 1 amp and above are Indicator fuses.
RECOMMENDED FUSE BLOCKSLR600 Series
Refer to Fuse Block section of this catalog for additionalinformation.
APPLICATIONSAll general-purpose circuitsMotorsTransformersSolenoidsFluorescent lightingAll system components with high in-rush currents
Photo #9
The all new LLSRK_ID series fuse is the most advancedClass RK1 fuse available today providing unparalleled performance and protection to modern circuits. The patentedIndicatorTM technology provides instant identification of ablown fuse greatly enhancing system up-time, while the precision formed short circuit elements virtually eliminatedamage to components from unexpected electrical faults.In addition, the all new solid-state overload section has no moving parts, stopping unnecessary fatigue failures commonly found in other spring loaded fuses.
FEATURES/BENEFITS■ Reduce down-time — The indicating window of the
LLSRK_ID immediately identifies the open fuse. If thewindow is dark, the fuse has opened. It’s that simple.Maintenance personnel can immediately determine thatthere is an open fuse.
■ Reduce fuse inventory — The superior performance of the LLSRK_ID allows it to be used in a variety of applications, thus decreasing fuse inventory.
■ Reduce nuisance opening — Indicator fuses offer superior time delay and cycling characteristics, which can lengthen fuse life.
■ Reduce equipment damage — Indicator fuses providesuperior overload and short-circuit protection that canreduce equipment damage. The LLSRK_ID is extremelycurrent limiting and provides IEC Type II “No Damage”protection to IEC and NEMA type motor starters.
■ Reduce accidents — The LLSRK_ID Indicator fuseimproves safety by minimizing exposure to live circuits.Unlike other forms of blown fuse indication, once the indicator window darkens, it stays dark. Other forms ofindication require the power to remain on, which causes a potential safety hazard to personnel.
NEW
11
TIM
E IN
SE
CO
ND
S
CURRENT IN AMPERES
60
AMP
35
AMP
30
AMP
15
AMP
12
AMP
5 A
MP
3.5
AM
P 2
.8 A
MP
2 A
MP
1.6
AM
P 1
.25
AMP
1 A
MP
1000
100
10
1
200010001001010.50.01
0.1
LLSRK_ID Series IndicatorTM POWR-PRO® Class RK1600 VAC ■ Dual-Element, Time-Delay ■ 1/10 – 600 Amperes
SYMMETRICAL R.M.S. AMPERESAVAILABLE FAULT CURRENT
PE
AK
LE
T-T
HR
U IN
AM
PE
RE
S
3.5A 5A
12A 30A
60A
2000
00
1000
00
1000
0
100010
0
1000000
10000000
100000
10000
1000
100
Contact Littelfuse for additional fuse curves.
NEW Blown FuseIndicator Assembly
Granular Quartz Filling
Plated EndCaps
Precision FormedShort Circuit Element
Fiberglass ReinforcedPultruded Body
Elastomeric SiliconeOverload Section
12
LLNRK/LLSRK Series POWR-PRO® Class RK1 250/600 VAC ■ Dual-Element, Time-Delay ■ 1/10 – 600 Amperes
Example part number (series & amperage): LLNRK 450
RECOMMENDED FUSE BLOCKSLR250 series (LLNRK Series)LR600 series (LLSRK Series)
Refer to Fuse Block section of this catalog for additional information.
FEATURES/BENEFITS■ Extremely current limiting — Reduces damage to circuits
and equipment under short-circuit conditions. Stops damaging short circuits faster than any mechanical protective device.
■ 300kA Interrupting Rating — Littelfuse self-certified to300,000 amperes as standard. Meets future trend towardshigher available short circuit currents.
■ Reduced costs — Current limiting design often permits use of readily available, less costly equipment. Low resistance design reduces power consumption and utilitybills.
■ Excellent time delay — True dual-element construction, with separate non-fatiguing thermally-reversible spring-loaded thermal overload element, withstands repeatedsurges within rated time delay without opening needlessly.Eliminates needless downtime caused by power surges orequipment demands.
Littelfuse LLNRK and LLSRK series POWR-PRO® fuses provide superior overload and short circuit protection for service entrance, main, feeder and general-purpose branchcircuits up to 600 amperes.
LLNRK/LLSRK series fuses can be installed in existing ClassH fuse blocks to upgrade systems containing lower interrupt-ing rating Class H one-time or renewable fuses.
APPLICATIONSAll general-purpose circuits
Motors
Transformers
Solenoids
Fluorescent lighting
All system components with high in-rush currents
13
LLNRK/LLSRK Series POWR-PRO® Class RK1 250/600 VAC ■ Dual-Element, Time-Delay ■ 1/10 – 600 Amperes
JTD_ID Series Indicator POWR-PRO® Class J Fuses600 VAC ■ Time Delay ■ 8/10 – 600 Amperes
The Littelfuse® POWR-PRO® JTD_ID Indicator Class J fuseprovides visual blown fuse indication and maximum protec-tion in a compact package. The compact Class J packagewas designed specifically for circuits where space is at apremium. The current limiting time delay JTD_ID offers apatented true dual-element design that is ideal for use incircuits with high inrush currents. Superior performancecharacteristics of JTD_ID Indicator fuses reduce nuisancefuse opening and the blown fuse indication reduces down-time and increases safety.
APPLICATIONSFused combination motor controllers to provide IEC Type II(no damage) motor branch-circuit short-circuit and groundfault protection
Motor control centers
Transformer protection
Protection for UL Listed series-rated molded case circuitbreaker panels
General purpose circuits — mains, feeders and branch circuits — especially when space is at a premium
FEATURES/BENEFITS■ Reduce down-time — A glance at the indicating window of
a JTD_ID Indicator fuse pinpoints open fuses immediately.If the window is dark, the fuse has opened. It’s that simple.
No fuse testing required. Machine operators can immedi-ately determine that there is an open fuse and requestmaintenance personnel to bring the proper replacement.
■ Reduce nuisance opening — Indicator fuses havesuperior time-delay and cycling characteristics which canlengthen fuse life and decrease needless opening.
■ Reduce fuse inventory — Because JTD_ID Indicatorfuses have superior performance characteristics they canbe used on a variety of applications, thus decreasing fuseinventory.
■ Reduce equipment damage — Indicator fuses providesuperior overload and short circuit protection that canreduce equipment damage. Indicator fuses also provideIEC Type II “No Damage” protection to IEC and NEMA typemotor starters.
■ Reduce accidents — The JTD_ID Indicator fuse improvessafety by minimizing exposure to live circuits. Unlike otherforms of blown fuse indication, once the indicator windowdarkens, it stays dark. It does not matter if the power is onor off or if the fuse is in a tool box. Other forms of indicationrequire the power to remain on, which causes a safetyhazard for personnel.
RECOMMENDED FUSE BLOCKSL60030C series (CCMR 2/10 — 30A)L60060C series (CCMR 35 — 60A)
Refer to Fuse Block section of this catalog for additional information.
For space-saving protection of motor circuits up to 40 HP*, werecommend Littelfuse POWR-PRO® CCMR series fuses.These fuses are the only true dual-element, time-delay fusesin a package this small that are specifically engineered formotor branch circuit protection. They provide Type 2 protec-tion (no damage) to both NEMA-rated and the more sensitiveIEC (International Electrotechnical Commission) type motorcircuit components.
Because CCMR fuses are the most current limiting rating forrating, and because their time-delay characteristics permit theuse of smaller fuse ratings in motor circuits than would bepossible with fast-acting fuses, CCMR fuses provide superiorshort-circuit protection. Furthermore, they provide this superior protection in a fraction of the space required by otherfuse classes. For example, when 600V three-pole, 30 ampereClass R fuse blocks are replaced by Littelfuse Class CC fuseblocks, mounting space requirements may be reduced 70% or more. This is especially important when a panel containscontrol devices for many motors.
In addition to the UL Listed smaller sizes, Littelfuse CCMRseries fuses are now available in larger sizes — from 35 to 60amperes! No other fuse is available with this current carrying capacity in a package this small. As a matter offact, the 60 ampere CCMR fuse is the smallest 60A fuseavailable which is rated at 600 volts.
APPLICATIONSCCMR series fuses are specifically designed to withstandsustained starting currents of small motors
Provide short-circuit protection for motor branch circuits
Use with IEC- and NEMA-rated motor controllers and contactors
General purpose circuits up to 60 amps
FEATURES/BENEFITS■ Space savings — No other fuse class approved for
branch-circuit protection has a 600 volt rating and 300,000A.I.R. in a package this small.
■ Extremely current-limiting — Reduces damage causedby heating and magnetic effects of short-circuit currents —stops damaging short-circuit currents faster than any mechanical protective device.
■ Excellent time delay — Eliminates needless downtimecaused by power surges or equipment demands . . .permits selection of fuse sizes closer to actual load conditions — provides better protection.
■ 300kA Interrupting Rating — Littelfuse self-certified to300,000 amperes as standard. Meets future trend towardshigher available short circuit currents.
*Consult the Motor Protection Tables in the Fuseology section for specific motor sizing information
19
CCMR Series POWR-PRO® CC Fuses600 VAC ■ Dual-Element, Time-Delay ■ 2/10 – 60 Amperes
2000
3000
4000
6000
8000
1000
0
2000
0
3000
040
000
6000
080
000
1000
00
2000
00100
200
300
400
600
800
1000
100
200
300400
600800
1000
2000
30004000
60008000
10000
20000
3000040000
6000080000
100000
200000
300000400000
600000800000
1000000
60A
30A20A15A12A10A6 1/4A
4A2A
PE
AK
LE
T-T
HR
U IN
AM
PE
RE
S
AVAILABLE FAULT CURRENTSYMMETRICAL R. M. S. AMPERES
Short Circuit Let-Thru Current** For Various Fuse Ratings
Refer to Fuse Block section of this catalog for additional information.
DIMENSIONSPlease refer to the FLSR_ID dimensions.
Example part number (series & amperage): IDSR 30Note: All fuses rated 1 amp and above are IndicatorTM fuses.
The Littelfuse IDSR Indicator™ fuse is the first indicatingpower fuse ever. Its solid-state design provides state-of-the-artreliability; it will forever change the way you look at moderncircuit protection.
Money is wasted each time a circuit opens and halts produc-tion. Thousands of dollars can be lost with every minute spenttesting to discover the cause.
The Littelfuse IDSR IndicatorTM fuse offers you a better way.Just a simple glance at the IDSR Indicator’s window tellswhich circuit is open. The circuit can be tested and any problem corrected without unnecessary delay. No time wasted finding the faulted circuit. No system damage. And nocostly down time.
APPLICATIONSAll general-purpose circuits
Motors
Transformers
Solenoids
Fluorescent lighting
All system components with high inrush currents
FEATURES/BENEFITS■ Patented design fuses — The first totally new dual-
element time-delay Class RK5 fuses in 10 years. They lookdifferent because they are different! Even the LittelfuseSLO-BLO® fuse, the fuse that set new standards for dual-element fuses when it was introduced in 1984, cannotmatch the performance of POWR-PRO® IndicatorTM fuses.
■ Pinpoint open fuses immediately — A glance at the window tells if the fuse has blown. If the window is dark, thefuse has opened. It’s that simple. No fuse testing required.
■ Reduce down-time — Machine operators can immediatelydetermine that there is an open fuse and request mainte-nance personnel to bring the correct replacement.
■ Superior time delay — POWR-PRO® IndicatorTM fusesprovide superior time delay to override current surges without sacrificing protection for sustained overloads. Thissuperior time delay is achieved by a remarkable advance inthe science of fuse design. Littelfuse-patented leading edgemetallurgy eliminates all moving parts in a true dual-element fuse.
CO
NTR
OL ENGINEERINGPRODUCTRODUCT
RECOGNITIONECOGNITIONAWAWARD
IIIIIIIIIIIIIII
21
IDSR Series Indicator™ POWR-PRO® Class RK5 600 V AC/DC ■ Time-Delay ■ 1/10 – 600 Amperes
Short Circuit Peak Let-Thru Current** for various fuse ratingsCurrent* 30A 60A 100A 200A 400A 600A
Littelfuse POWR-PRO® LDC series Class L fuses representanother first in fuse protection. LDC series fuses are the firstUL Listed 600 volts AC and DC Class L fuse. Since they maybe used for both AC and DC, they eliminate the concern thatAC only fuses may be inserted into DC circuits.
While LDC series fuses’ UL Listed DC interrupting rating ismore than adequate for most applications (50,000 amperes ata 16 millisecond time constant), tests in our high power testing laboratory have shown that this remarkable fuse iscapable of performing at much longer time constants. Thismakes the fuse uniquely suited for such applications as cranerail circuits and mass transit systems. Contact the factory forapplication information for special needs such as this.
For AC-only systems, consider the use of POWR-PRO®
KLPC series fuses. They have a full ten seconds time-delayat 500% rated current, and have a wider range of ratings.
APPLICATIONSUPS protection, especially for large battery circuits
DC distribution
DC variable speed drives
Protection of crane rail circuits and other large DC equipmentsuch as electrical power shovels, ship and dock cranes, etc.
Mass transit systems, including new light rail applications
General-purpose AC/DC circuits for mains, feeders, andbranch circuits
FEATURES/BENEFITS■ 600 Volt AC/DC rated — “All-purpose” Class L fuse
reduces inventory requirements because the need for special fuses is eliminated.
■ UL Listed 200,000 A.I.R. AC – 50,000 A.I.R. DC —Reliable interruption of all overcurrents up to their ratings.Minimizes the need for time-consuming and expensiveshort-circuit studies.
■ Moderate time delay — Four seconds time delay at 500%current provides adequate time-delay for many AC applications and most DC applications. They will withstandmost harmless overloads or line surges. If your needsexceed the LDC capabilities, consider the use of KLPCfuses for AC applications.
■ Selective coordination — LDC series fuses coordinatewell with all Littelfuse fuses rated 600 amperes or less.A combination of LDC and IDSR series fuses provide acomplete 600 volt rated DC system.
■ Extremely current limiting — Maximum current limitationreduces damage to circuits and equipment under short-circuit conditions. Stops damaging short circuits faster thanany mechanical protective device.
23
Short Circuit Peak Let-Thru Current** for various fuse ratings
KLLU series UL Listed, time-delay, Class L fuses are qualityfuses in every sense of the word. They were developed toprovide a somewhat lower priced alternate to the POWR-PRO® KLPC series fuses. KLLU series fuses meet or exceedall UL requirements for Class L fuses. For superior protectionand performance, specification-grade POWR-PRO® KLPCseries fuses are the recommended fuse. Complete informa-tion on KLPC fuses may be found in the POWR-PRO® sectionof this catalog.
APPLICATIONSService switches
Switchboard mains and feeders
Bolted pressure contact switches
Motor control center mains
Large motor branch circuits
UL Listed series-rated protection for molded case circuitbreaker panelboards and loadcenters. See panelboard manufacturers’ literature for recommended fuse rating.
SAFETY■ 200,000 A.I.R. — Provides reliable interruption of all
overcurrents up to 200,000 amperes.
■ When used for motor branch circuit protection, KLLU fusesmay be sized close to the motor full-load current, providingexcellent protection to branch circuit conductors, motorcontrol equipment and motors.
LONGER EQUIPMENT LIFE■ Current Limiting — Reduces short circuit damage to
systems and equipment.
■ Reduced downtime.
■ Ten second minimum time delay at 500 percent of ratingeliminates needless downtime caused by heavy startingcurrents of large motors and other inductive loads.
■ Selective coordination — KLLU fuses coordinate well withother Class L fuses and with all current-limiting Littelfusefuses rated 600 amps or less. This means less time spenttrying to locate short circuits or overloaded equipment,because only the fuse immediately on the line side of theaffected circuit opens.
EASY TO USE■ 200,000 A.I.R. rating minimizes need for short circuit
calculations . . . meets present and future system requirements.
■ KLLU fuse time-current characteristics closely match typicaltime-current curves of circuit breakers. Although fuse/circuit breaker systems can seldom be 100% coordinated,KLLU series fuses permit use of a wider range of breakersetting than fast-acting Class L fuses. Excellent protectionfor a single breaker or a group of breakers.
NOTE: For 1/10 – 30 ampere 250 volt fuses, order non-indicating FLNR series fuses.
NOTE: All FLNR_ID fuses rated 35 – 600A are Indicatorfuses.
NOTE: All FLSR_ID fuses rated 1 amp and above areIndicator fuses.Example part number (series & amperage): FLSR100ID
RECOMMENDED FUSE BLOCKSLR250 series (for FLNR_ID series fuses)LR600 series (for FLSR_ID series fuses)
Refer to Fuse Block section of this catalog for additional information.
APPLICATIONSService entrance switchesSwitchboard main and feeder switchesMotor control center mains and motor branch circuitsIndividual fused combination motor controllersDistribution panelboardsIndustrial control panelsProtection of fully-rated panelboards and loadcentersAll general purpose circuits
FEATURES/BENEFITS■ Reduce Down-Time — A glance at the indicating window
of a FLNR_ID or FLSR_ID IndicatorTM fuse pinpoints openfuses immediately. If the window is dark, the fuse hasopened. It’s that simple. No fuse testing required. Machineoperators can immediately determine that there is an openfuse and request maintenance personnel to bring the prop-er replacement.
■ Reduce Nuisance Opening — FLNR_ID and FLSR_IDIndicatorTM fuses have superior time-delay and cyclingcharacteristics which can lengthen fuse life and decreaseneedless opening.
■ Reduce Fuse Inventory — Because FLNR_ID andFLSR_ID IndicatorTM fuses have superior performancecharacteristics they can be used on a variety of applica-tions, thus decreasing fuse inventory.
■ Reduce Equipment Damage — FLNR_ID and FLSR_IDIndicatorTM fuses have superior overload and short circuitprotection which can reduce equipment damage.IndicatorTM fuses also provide IEC Type II protection toNEMA motor starters without the high cost of RK1 fuses.
■ Reduce Accidents — The FLNR_ID and FLSR_IDIndicatorTM fuses improve safety by minimizing exposure tolive circuits. Unlike other forms of blown fuse indication,IndicatorTM fuses provide built-in blown fuse indication withthe power on or off. No second guessing whether a lightmeans a good or bad fuse and no current going across ablown fuse to power a lighted accessory.
Littelfuse FLNR_ID/FLSR_ID IndicatorTM fuses provide visualblown fuse indication at a glance. The patented state-of-the-art solid state design provides maximum reliability and superior performance characteristics in a true dual-elementdesign. The use of IndicatorTM fuses reduces down-time, nuisance opening, increases safety, and can save thousandsof dollars in lost production time.
**
1996
29
TIM
E I
N S
EC
ON
DS
CURRENT IN AMPERES
FLSR_ID
.01
.02
.03
.04
.06
.08.1
.2
.3
.4
.6
.81
23468
10
2030406080
100
200300400600800
1000
10864321 1000080006000400030002000
1000800600400300200
1008060403020
1A 1.25
A1.
6A2A 2.
5A3A 4A 6A 10
A15
A20
A25
A30
A
FLNR_ID/FLSR_ID IndicatorTM Class RK5 Fuses250/600 VAC ■ Dual-Element, Time Delay ■ 1/10 – 600 Amperes
AMPERES
1/10 – 30
35 – 60
70 – 100
110 – 200
225 – 400
450 – 600
A B C D E F G H J K
For additional application information request Product Bulletin EL-4
DIMENSIONS IN INCHES (mm in parentheses)REFER TOFIG. NO.
**FLNR only, *FLSR onlyExample part number (series & amperage): FLSR100
RECOMMENDED FUSE BLOCKSLR250 series (for FLNR series fuses)LR600 series (for FLSR series fuses)
Refer to Fuse Block section of this catalog for additional information.
APPLICATIONSService entrance switchesSwitchboard main and feeder switchesMotor control center mains and motor branch circuitsIndividual fused combination motor controllersDistribution panelboardsIndustrial control panelsProtection of fully-rated panelboards and loadcentersAll general purpose circuits
SAFETY■ 200,000 A.I.R. — Reliable interruption of all overcurrents
up to 200,000 amperes.■ Faster acting short circuit protection than any non-current
limiting mechanical protective device.
RELIABILITY■ Accurate and reliable — Automated, precision manufac-
tured and assembled parts ensure accurate, consistentresponse to overloads and short circuits.
Littelfuse FLNR/FLSR series fuses have been the superiorUL Class RK5 dual-element time-delay fuses, and are themost widely used class of fuses. FLNR/FLSR series fusesprovide excellent protection for all types of circuits especiallythose containing motors. However, users and specifiersshould consider the significant benefits offered by Indicatorfuses. Complete information on these fuses may be found inthis section of this catalog.
**
LONGER EQUIPMENT LIFE■ Reduced damage to equipment caused by heating
and magnetic forces of short circuits.■ Equipment runs cooler with low-resistance
dual-element fuses.
32
FLNR/FLSR Class RK5 Fuses250/600 VAC ■ Dual-Element, Time Delay ■ 1/10 – 600 Amperes
AF
EC
DG B
A
J
K
H
B
C
F D G
70-600AFIG. 1 FIG. 2
E
AMPERES
1/10 – 30
35 – 60
70 – 100
110 – 200
225 – 400
450 – 600
A B C D E F G H J K
DIMENSIONS IN INCHES (mm in parentheses)REFER TOFIG. NO.
SAFETY■ 200,000 A.I.R. — Reliable interruption of all overcurrents up
to 200,000 amperes.
■ Extremely current limiting — Stops damaging short-circuitcurrent faster than any mechanical protective device.
■ Fast-acting — Provides fast-acting protection to equipmentsuch as variable speed drives, rectifiers and other equip-ment containing surge-sensitive components.
LONGER EQUIPMENT LIFE■ Current-limiting design reduces damage to equipment
caused by heating and magnetic effects of short-circuitcurrents.
ECONOMICAL■ Extremely current-limiting — often permits use of readily
available, less costly equipment.
■ Used as input or output fuses for surge-sensitive compo-nents, such as variable speed drives and rectifiers, fast-acting KLNR/KLSR fuses may prevent opening of expen-sive semiconductor fuses protecting individual components.
EASY TO USE■ 200,000 A.I.R. rating minimizes need for short circuit
calculations.
DIMENSIONS■ Refer to FLNR for KLNR dimensions and FLSR for
KLSR dimensions.
KLNR/KLSR series RK1 fuses were the earliest type of current-limiting fuse developed. Their single-element, silverlink design enables them to provide fast-acting overload andshort-circuit protection. When used to protect inductive loadssuch as motors, solenoids, and transformers, KLNR/KLSRseries fuses must be greatly oversized to prevent opening thefuses on harmless inrush currents. In such applications,KLNR/KLSR series fuses may only provide short-circuit protection.
We recommend using POWR-PRO® LLNRK/LLSRK seriesRK1, dual-element, time-delay fuses in all new applicationsrequiring the current-limiting ability of UL Class RK1 fuses, orin existing applications where fast-acting RK1 or RK5 fuseshave been opening on harmless system surges such asmotor starting currents.
APPLICATIONSResistance heaters
Lighting circuits
Non-inductive loads
Molded case circuit breaker load centers and panelboardshave increased interrupting ratings when “series rated” withLittelfuse KLNR/KLSR Class RK1 fuses. Refer to panelboardmanufacturer’s literature for UL Listed combination of fusesand panelboards. Series ratings up to 200,000 amperes are available.
34
1000800600
400300
200
1008060
4030
20
1086
43
2
1.8.6
.4
.3
.2
.1.08.06
.04
.03
.02
.01
200
300
400
600
800
1000
2000
3000
4000
6000
8000
1000
0
2000
0
3000
040
000
6000
080
000
1000
0010 20 30 40 60 80 100
30A
60A
100A
200A
400A
600A
TIM
E IN
SE
CO
ND
S
CURRENT IN AMPERES
1000800600
400300
200
1008060
4030
20
1086
43
2
1.8.6
.4
.3
.2
.1.08.06
.04
.03
.02
.01
200
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800
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2000
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0
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0
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000
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080
000
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0010 20 30 40 60 80 1005
30A
60A
100A
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400A
600A
TIM
E IN
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CURRENT IN AMPERES
2000
3000
4000
6000
8000
1000
0
2000
0
3000
040
000
6000
080
000
1000
00
2000
00100
200
300
400
600
800
1000
100
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300400
600800
1000
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30004000
60008000
10000
20000
3000040000
6000080000
100000
200000
300000400000
600000800000
1000000
600A400A
200A
100A60A
30A
PE
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U IN
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PE
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S
AVAILABLE FAULT CURRENTSYMMETRICAL R. M. S. AMPERES
2000
3000
4000
6000
8000
1000
0
2000
0
3000
040
000
6000
080
000
1000
00
2000
00100
200
300
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800
1000
100
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300400
600800
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30004000
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20000
3000040000
6000080000
100000
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300000400000
600000800000
1000000
600A400A
200A
100A
60A
30A
PE
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AVAILABLE FAULT CURRENTSYMMETRICAL R. M. S. AMPERES
NLN and NLS series fuses provide low cost protection forgeneral purpose feeder and branch circuits when availableshort circuit currents are less than 50,000 amperes. Theyreplace all Class H fuses which have only a 10,000 ampereinterrupting rating. They are suitable for use in many residen-tial and smaller commercial and industrial applications.
NLKP series fuses are Canadian “Code” fuses specificallydesigned to meet Canadian Electrical Code Type P fuse requirements for residential use. They have a 10,000 ampereinterrupting rating.
However, to obtain the added benefits of time-delay, current-limitation, and higher interrupting rating, consider the use ofPOWR-PRO® IDSR IndicatorTM fuses for circuits between250 and 600 volts. The user gets all the benefits of time-delayRK5 fuses plus the added benefits of an indicating fuse thattells when it has opened. Complete information on thesefuses may be found in the POWR-PRO® section of this catalog. For circuits up to 250 volts, see FLNR fuses in thissection of the catalog.
APPLICATIONSGeneral purpose residential and commercial circuits with little or no motor load.
Resistive heating loads.
ECONOMICAL■ For use in applications where lowest initial cost is the
major consideration.
SAFETY■ 50,000 A.I.R., Class K5 — Adequate interrupting capacity
NLKP: Standard 248-6, Class HUL Listed (File No: E81895)CSA Certified (File No: LR29865)Meets CSA “Type P” requirements
AMPERE RATINGS
NOTE: NLKP series fuses have limited interrupting rating andshould be used only where available short circuit current isknown to be less than the fuse interrupting rating. Whereavailable fault current is unknown, where it exceeds NLN/NLSinterrupting rating, or where it may increase in the future,200,000 ampere interrupting rating Littelfuse POWR-PROTM
FLNR_ID/FLSR_ID IndicatorTM fuses and FLNR/FLSR seriesfuses provide superior protection for all motor and generalpurpose circuits containing inductive loads.
RLN/RLS Class H Fuses250/600 VAC ■ Renewable ■ 1 – 600 Amperes
SPECIFICATIONSVoltage Ratings: AC: 250 Volts (RLN); 600 Volts (RLS)Interrupting Ratings: AC: 10,000 amperes rms symmetricalAmpere Range: 1 – 600 amperesApprovals: Standard 248-6, Class H
UL Listed (File No: E81895)CSA Certified (File No: LR29862)
FUSE LINKS: To order, specify LKN (250V) or LKS (600V)plus ampere rating shown below.
AMPERE RATINGS
Example part number (series & amperage): RLN 20
RECOMMENDED FUSE BLOCKSLH250 series (for RLN series fuses)LH600 series (for RLS series fuses)
Refer to Fuse Block section of this catalog for additional information.
Littelfuse RLN/RLS series renewable fuses are a qualityproduct that have traditionally been used to provide low costprotection of general purpose feeder and branch circuitswhere available short-circuit currents do not exceed 10,000amperes. However, generally increased levels of availablefault current and the distinct possibility that renewable fusesmay be improperly renewed, rendering them unsafe, have allbut eliminated the use of these fuses in new applications. Inaddition, escalating labor costs and increasing automation,which makes downtime very expensive, have greatly reducedor eliminated the cost savings attributed to renewable fuses.
We recommend the use of POWR-PRO® IDSR seriesIndicator™ fuses for circuits between 250 and 600 volts and FLNR series for 250 volt and below circuits. Complete information on POWR-PRO® Indicator fuses may be found in the POWR-PRO® section of this catalog. FLNR fuses arein this section of the catalog.
COST CONSIDERATIONS■ When comparing the cost of using renewable fuses with the
cost of other fuses, the labor required for replacing linksand the cost of additional downtime should be included.
CAUTIONS■ Renewable fuses should only be used where short circuit
currents are known to be less than 10,000 amperes, andwhere correct replacement of open links is assured.
■ After disassembly of fuse, examine carefully. Discard any fuses which show evidence of weakened tube or damaged components.
■ Remove all link residue from fuse tube.
■ Carefully clean all contact surfaces, and remove metalspatter from all surfaces.
■ Install the proper rated fuse link and tighten all connections securely.
■ Visually examine fuses for correct alignment of blades.
DIMENSIONS■ For dimensions, please refer to NLN series for RLN
dimensions and NLS series for RLS dimensions.
12345
681012 **15
2025303540
4550607080
90100110125150
175200225 *250 *300 *
350 *400 *450 *500 *600 *
*These ampere ratings require two links per fuse.**RLS Only.
Refer to Fuse Block section of this catalog for additional information.
LONGER EQUIPMENT LIFE■ Current-limiting design reduces damage to equipment
caused by heating and magnetic effects of short-circuitcurrents.
ECONOMICAL■ Extremely current-limiting design often permits use of
readily available, less costly equipment.
■ Manufacturers of equipment containing dual voltagedevices can simplify manufacturing and reduce inventoryby standardizing on 600 volt JLS fuses and Class J fuseblocks for all AC voltage ratings.
EASY TO USE■ 200,000 A.I.R. rating minimizes need for short-circuit
calculations.
NOTE: Littelfuse JLS fuses are not time-delay fuses. For applications where short-duration surges and spikes maycause nuisance fuse opening, consider the use of LittelfusePOWR-PRO® JTD series time-delay fuses.
JLS series fuses provide space-saving, fast-acting overloadand short-circuit protection for non-inductive loads. Whenused for motors or other inductive loads, the ampere rating of JLS series fuses must be increased to prevent nuisanceopening on inrush currents. In such applications, JLS fusesmay provide only short circuit protection. Consider usingLittelfuse POWR-PRO® JTD series time-delay fuses in such circuits.
APPLICATIONSGeneral purpose circuits with little or no motor load.
Resistive loads, such as resistance electric heat.
Loads requiring fast-acting overload protection, such asequipment containing solid-state devices.
SPACE SAVING■ JLS fuse characteristics are similar to KLNR/KLSR fast-
acting Class RK1 fuses, but they are much smaller.
SAFETY■ 200,000 A.I.R. — Reliable interruption of all overcurrents up
to 200,000 amperes.
■ Extremely current limiting — Stops damaging short-circuitcurrent faster than any mechanical protective device.
■ Fast-acting — Provides fast-acting protection to equipmentsuch as variable speed drives, rectifiers and other equip-ment containing surge-sensitive components.
RECOMMENDED FUSE BLOCKSLT300 series (for JLLN series fuses) LT600 series (for JLLS series fuses)
Refer to Fuse Block section of this catalog for additional information.
■ Extremely current limiting — Stops damaging short circuitcurrent faster than any mechanical protective device.
■ Fast-acting — Provides fast-acting overload protection toequipment such as variable speed drives, rectifiers andother equipment containing surge-sensitive components.
LONGER EQUIPMENT LIFE■ Current limiting design greatly reduces damage to equip-
ment caused by heating and magnetic effects of short circuit currents.
ECONOMICAL■ Extremely current limiting design often permits use of
readily available, less costly equipment.
■ Used as input or output fuses for surge-sensitive compo-nents, such as variable speed drives and rectifiers, fast-acting POWR-T JLLN/JLLS fuses may prevent opening of expensive semiconductor fuses protecting individual components.
NOTE: JLLN Class T 300 volt fuses are UL listed for circuitsnot exceeding 300 volts to ground. However, since UL doesnot include testing 300 volt Class T fuses on 277/480 voltthree-phase bolted faults, Littelfuse does not recommendusing 300 volt Class T fuses where phase-to-phase voltageexceeds 300 volts.
Space saving POWR-T™ fuses are the most compact fusesavailable in ratings above 30 amperes — less than one-thirdthe size of comparable Class R fuses. When rated in accor-dance with the NEC, POWR-T fuses provide fast-actingoverload and short circuit protection for non-inductive circuitsand equipment. Used in inductive circuits, the ampere ratingof POWR-T fuses must be increased to prevent opening oninrush currents. In such instances, POWR-T fuses may provide only short circuit protection.
For motor and general purpose circuits where space is notcritical, we recommend POWR-PRO® JTD_ID Indicatorseries, LLNRK/LLSRK series, or FLSR_ID Indicator series.
APPLICATIONSProtection of individual electric services and meters.
Main switches containing Class T fuses may be used to provide compact protection for meter stacks.
Molded case circuit breaker load centers and panelboardshave increased interrupting ratings when “series rated” withLittelfuse Class T fuses. Refer to panelboard manufacturers’literature for UL Listed combination of fuses and panelboards.Series ratings up to 200,000 amperes are available.
SPACE-SAVINGTypical three-pole Class T fuse blocks require less than 50%of the panel area required for Class R fuse blocks. Switchenclosures, fuse pullouts, and other equipment using Class Tfuses are often correspondingly more compact.
SAFETY■ 200,000 A.I.R. — Reliable interruption of all overcurrents up
to 200,000 amperes.
41
JLLN/JLLS POWR-T™ Class T Fuses300/600 VAC ■ Fast-Acting ■ 1 – 1200 Amperes
JLLN/JLLS POWR-T™ Class T Fuses300/600 VAC ■ Fast-Acting ■ 1 – 1200 Amperes
1000800600
400300
200
1008060
4030
20
1086
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1.8.6
.4
.3
.2
.1.08.06
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A
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1000800600
400300
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1008060
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20
1086
43
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1.8.6
.4
.3
.2
.1.08.06
.04
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0
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0
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1200A800A600A400A
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AVAILABLE FAULT CURRENTSYMMETRICAL R. M. S. AMPERES
2000
3000
4000
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8000
1000
0
2000
0
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040
000
6000
080
000
1000
00
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600000800000
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800A600A
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30A
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AVAILABLE FAULT CURRENTSYMMETRICAL R. M. S. AMPERES
JLLSJLLN
JLLSJLLN
43
SLC Class G Fuses480 VAC, 600 VAC ■ Medium Time-Delay ■ 1/2 – 60 Amperes
The unique design of Littelfuse’s compact SLC series ClassG fuses provide additional time-delay over competitive prod-ucts which increases system reliability.Compact Class G fuses were the first fuse series toapproach midget fuse dimensions and meet NEC require-ments for branch-circuit protection. The unique dimensionsof SLC series Class G fuses prevents insertion of lower volt-age fuses in Class G fuse holders. The fuse’s varying lengthprevents insertion of higher ampere rated fuses in fuse holders designed for lower ampere ratings.Class CC fuses are replacing Class G fuses in many newdesigns. Class CC fuses’ superior time delay plus highervoltage and interrupting ratings meet the needs of moderncircuits. Littelfuse’s introduction of POWR-PRO® CCMRseries fuses, with ratings up to 60 Amperes for providingbranch circuit protection, are accelerating this trend. Com-plete information on POWR-PRO® CCMR series fuses maybe found in the POWR-PRO® section of this catalog.
SAFETY■ 100,000 A.I.R. — Reliable interruption of all overcurrents
up to 100,000 amperes.■ Current limiting design reduces damage to equipment
caused by heating and magnetic effects of short circuitcurrents.
■ Medium time-delay allows fuses to be sized closer to actual equipment requirements — no need to greatly over-size to withstand harmless equipment or system surges.
REDUCED DOWNTIME■ Medium time-delay may reduce downtime caused by
power surges or equipment demands.NOTE: For applications where greater time delay is required,or where ratings exceed 60 amperes, consider selectingLittelfuse time-delay RK1, RK5, or Class J fuses.
SPECIFICATIONSVoltage Ratings: 600Volts AC (1/2 – 20A)
480 Volts AC (25 – 60A)Interrupting Ratings: 100,000 amperes rms symmetricalAmpere Range: 1/2 – 60 amperesApprovals: Standard 248-5, Class G
UL Listed (File No: E81895)CSA Certified (File No: LR29862)QPL: Federal Specification No: WF-1814
Approvals: AC: Standard 248-4, Class CCUL Listed 1/10-30 Amps (File No: E81895)Standard 248, Class CDUL Listed 35-60 Amps (File No: E71611)CSA Certified 1/10-60 Amps (File No: LR29862)
DC: Littelfuse Self-certified
RECOMMENDED FUSE BLOCKSL60030C series L60060C series (for CCMR 35–60A)
Refer to Fuse Block section of this catalog for additional information.
Compared to other UL Listed fuses, Class CC fuses are themost current limiting, rating for rating. Because they arephysically compact, they provide this superior protection in afraction of the space required by other fuse classes. Forexample, when 600V three-pole, 30 ampere Class R fuseblocks are replaced by Littelfuse Class CC fuse blocks, panelmounting space is reduced approximately 70%. This isespecially important when a panel contains many fuses toprotect multiple circuit components.
APPLICATIONSThree Types of Class CC Fuses, Specifically Designedto Protect Different Types of Components1) Motor protection — CCMR series; dual-element, time-delay fuses specifically designed to protect motor circuitsup to 40 HP**.2) Small transformer protection (control power transformers) — KLDR series, time-delay fuses designedto withstand the high magnetizing inrush of transformers.3) General purpose protection of equipment requiringfast overload protection — KLKR series, fast-acting fuses used for protection of equipment containing solid-state devices or other electronic components requiring fastresponse on overloads.
SAFETY■ 200,000 A.I.R. — Reliable interruption of all overcurrents up
to 200,000 amperes.■ Extremely current limiting — Reduces damage caused by
heating and magnetic effects of short-circuit currents . . .stops damaging short-circuit currents faster than any mechanical protective device.
SPACE SAVING■ Class CC fuses are the smallest 600V, 200,000 A.I.R. fuses
approved for branch circuit protection.
ECONOMICAL■ Current limiting design often permits use of readily avail-
able, less costly equipment.
1.50"(38.1 mm)
.50"(12.7 mm)
.41"(10.3 mm)
.25"(6.4 mm)
.125"(3.2 mm)
0-30A
**Consult the Motor Protection Tables in the Fuseology section for specific motor sizing information
†Refer to the POWR-PRO® section for additional information.
35-60A
45
For space-saving protection of motor circuits up to 40 HP**, we recommendLittelfuse POWR-PRO® CCMR seriesfuses. These fuses are the only truedual-element time-delay CC fusesspecifically engineered for motor branchcircuit protection. They provide Type IIprotection (no damage) to both NEMA-rated and the more sensitive IEC(International Electromechanical Com-mission) type motor circuit components.CCMR series fuses are now available inlarger sizes — from 35 to 60 amperes!No other 600V fuse is available withthis current carrying capacity in apackage this small.
For more information on CCMR seriesClass CC fuses, see the CCMR seriespages in the POWR-PRO® section ofthis catalog.1/10 – 30A: UL Listed Time-Delay
Class CC 35 – 60A: UL Listed Class CD
KLDR fuses are time-delay fuses specif-ically designed for the protection of con-trol transformers, solenoids and similarinductive components with high magne-tizing currents during the first half-cycle.They closely match most control powertransformer characteristics, which per-mits the fuses to be sized in accordancewith the latest revisions of UL 508(Industrial Control) and UL 845 (MotorControl Centers). When the time delayof KLDR fuses is adequate to carrymotor starting current, they provide ex-cellent protection of motor branch cir-cuits containing IEC or NEMA ratedmotor controllers or contactors.
KLKR series Class CC fuses are fast-acting fuses intended for general pur-pose branch circuit protection. Theircompact size, fast-acting overloadresponse, and their highly current limit-ing design make them ideal for use inOEM equipment and control panels.Solid-state devices such as SCRs andother electronic equipment generallyrequire fast-acting protection.
Example part number (series & amperage): KLDR 5 6⁄10
DESCRIPTIONEdison-base plug fuses (WOO, TOO, and TLO series) havethreaded metal shells and contacts similar to incandescentlamp bases. Fuseholders for Edison-base fuses havematching metal threads similar to standard light sockets.Type S fuses (SLO and SOO series) have nonmetallicthreaded bases which fit matching nonmetallic threads inType S fuseholders. Type S fuseholders are size-limiting, andwill not accept Type S fuses with ampere ratings greater thanthe ampere rating marked on the Type S fuseholder. Type Sfuses will not fit Edison-base fuseholders, nor can Edison-base fuses be used in Type S fuseholders.Approvals: Standard 248-11, UL Listed Plug FusesNote: Although rated at 125 volts, NEC permits plug fuses tobe used in circuits not exceeding 150 volts to ground. SeeNEC Article 240-E.
HOLDERSSee Littelfuse box cover units in the Miscellaneous Productssection of this catalog.
SAO Type S Fuse Adapters inserted into Edison-base fuseholders permanently convert them to Type S fuseholders.They accept Type S fuses only.
APPLICATIONSThe National Electric Code now permits Edison-base fuses tobe used only for replacements in existing installations, andthen, only when there is no evidence of overfusing or tampering. All new Edison-base fuseholders must have TypeS fuse adapters installed before they are placed in service.Designed to prevent installation of wrong size fuses, Type SAdapters (SAO series) screw into Edison-base fuseholders sothey may accept Type S fuses. Once installed the adapterscannot be removed.To prevent shunting of open fuses or overfusing, and toreduce nuisance fuse opening, it is recommended that SAOadapters with properly rated SLO or SOO series fuses beinstalled in all Edison-base fuseholders.
TYPE S PLUG FUSES
SOO Fuses are dual-element time-delay Type S fuses designed for motorand motor branch-circuit protection;also suitable for all general-purposecircuits.
TOO Fuses are dual-element time-delay Edison-base fuses designed formotor and motor branch-circuit protection; also suitable for all general-purpose circuits. Use for replacementpurposes only.
WOO Fuses are non-delay Edison-base fuses, best suited for incandes-cent lighting, resistance heating, andgeneral purpose circuits with no significant motor load. Not recom-mended for motor circuits. See TOOand SOO fuses. Use for replacementpurposes only.
AMPERE RATINGS1⁄2 2 5 8 15 251 3 6 10 20 30
EDISON-BASE PLUG FUSES
TLO Fuses are medium time-delayEdison-base fuses designed for general-purpose branch-circuit protection. See TOO and SOO fusesfor motor protection. Use for replace-ment purposes only.
AMPERE RATINGS15 20 25 30
SLO Fuses are medium time-delayType S fuses for general-purposebranch-circuit protection.
AMPERE RATINGS15 20 25 30
KLLU Class L Fuses600 VAC ■ Time-Delay ■ 601 – 4000 Amperes
KLLU series UL Listed, time-delay, Class L fuses are qualityfuses in every sense of the word. They were developed toprovide a somewhat lower priced alternate to the POWR-PRO® KLPC series fuses. KLLU series fuses meet or exceedall UL requirements for Class L fuses. For superior protectionand performance, specification-grade POWR-PRO® KLPCseries fuses are the recommended fuse. Complete informa-tion on KLPC fuses may be found in the POWR-PRO® sectionof this catalog.
APPLICATIONSService switches
Switchboard mains and feeders
Bolted pressure contact switches
Motor control center mains
Large motor branch circuits
UL Listed series-rated protection for molded case circuitbreaker panelboards and loadcenters. See panelboard manufacturers’ literature for recommended fuse rating.
SAFETY■ 200,000 A.I.R. — Provides reliable interruption of all
overcurrents up to 200,000 amperes.
■ When used for motor branch circuit protection, KLLU fusesmay be sized close to the motor full-load current, providingexcellent protection to branch circuit conductors, motorcontrol equipment and motors.
LONGER EQUIPMENT LIFE■ Current Limiting — Reduces short circuit damage to
systems and equipment.
■ Reduced downtime.
■ Ten second minimum time delay at 500 percent of ratingeliminates needless downtime caused by heavy startingcurrents of large motors and other inductive loads.
■ Selective coordination — KLLU fuses coordinate well withother Class L fuses and with all current-limiting Littelfusefuses rated 600 amps or less. This means less time spenttrying to locate short circuits or overloaded equipment,because only the fuse immediately on the line side of theaffected circuit opens.
EASY TO USE■ 200,000 A.I.R. rating minimizes need for short circuit
calculations . . . meets present and future system requirements.
■ KLLU fuse time-current characteristics closely match typicaltime-current curves of circuit breakers. Although fuse/circuit breaker systems can seldom be 100% coordinated,KLLU series fuses permit use of a wider range of breakersetting than fast-acting Class L fuses. Excellent protectionfor a single breaker or a group of breakers.
NOTE: For 1/10 – 30 ampere 250 volt fuses, order non-indicating FLNR series fuses.
NOTE: All FLNR_ID fuses rated 35 – 600A are Indicatorfuses.
NOTE: All FLSR_ID fuses rated 1 amp and above areIndicator fuses.Example part number (series & amperage): FLSR100ID
RECOMMENDED FUSE BLOCKSLR250 series (for FLNR_ID series fuses)LR600 series (for FLSR_ID series fuses)
Refer to Fuse Block section of this catalog for additional information.
APPLICATIONSService entrance switchesSwitchboard main and feeder switchesMotor control center mains and motor branch circuitsIndividual fused combination motor controllersDistribution panelboardsIndustrial control panelsProtection of fully-rated panelboards and loadcentersAll general purpose circuits
FEATURES/BENEFITS■ Reduce Down-Time — A glance at the indicating window
of a FLNR_ID or FLSR_ID IndicatorTM fuse pinpoints openfuses immediately. If the window is dark, the fuse hasopened. It’s that simple. No fuse testing required. Machineoperators can immediately determine that there is an openfuse and request maintenance personnel to bring the prop-er replacement.
■ Reduce Nuisance Opening — FLNR_ID and FLSR_IDIndicatorTM fuses have superior time-delay and cyclingcharacteristics which can lengthen fuse life and decreaseneedless opening.
■ Reduce Fuse Inventory — Because FLNR_ID andFLSR_ID IndicatorTM fuses have superior performancecharacteristics they can be used on a variety of applica-tions, thus decreasing fuse inventory.
■ Reduce Equipment Damage — FLNR_ID and FLSR_IDIndicatorTM fuses have superior overload and short circuitprotection which can reduce equipment damage.IndicatorTM fuses also provide IEC Type II protection toNEMA motor starters without the high cost of RK1 fuses.
■ Reduce Accidents — The FLNR_ID and FLSR_IDIndicatorTM fuses improve safety by minimizing exposure tolive circuits. Unlike other forms of blown fuse indication,IndicatorTM fuses provide built-in blown fuse indication withthe power on or off. No second guessing whether a lightmeans a good or bad fuse and no current going across ablown fuse to power a lighted accessory.
Littelfuse FLNR_ID/FLSR_ID IndicatorTM fuses provide visualblown fuse indication at a glance. The patented state-of-the-art solid state design provides maximum reliability and superior performance characteristics in a true dual-elementdesign. The use of IndicatorTM fuses reduces down-time, nuisance opening, increases safety, and can save thousandsof dollars in lost production time.
**
1996
29
TIM
E I
N S
EC
ON
DS
CURRENT IN AMPERES
FLSR_ID
.01
.02
.03
.04
.06
.08.1
.2
.3
.4
.6
.81
23468
10
2030406080
100
200300400600800
1000
10864321 1000080006000400030002000
1000800600400300200
1008060403020
1A 1.25
A1.
6A2A 2.
5A3A 4A 6A 10
A15
A20
A25
A30
A
FLNR_ID/FLSR_ID IndicatorTM Class RK5 Fuses250/600 VAC ■ Dual-Element, Time Delay ■ 1/10 – 600 Amperes
AMPERES
1/10 – 30
35 – 60
70 – 100
110 – 200
225 – 400
450 – 600
A B C D E F G H J K
For additional application information request Product Bulletin EL-4
DIMENSIONS IN INCHES (mm in parentheses)REFER TOFIG. NO.
**FLNR only, *FLSR onlyExample part number (series & amperage): FLSR100
RECOMMENDED FUSE BLOCKSLR250 series (for FLNR series fuses)LR600 series (for FLSR series fuses)
Refer to Fuse Block section of this catalog for additional information.
APPLICATIONSService entrance switchesSwitchboard main and feeder switchesMotor control center mains and motor branch circuitsIndividual fused combination motor controllersDistribution panelboardsIndustrial control panelsProtection of fully-rated panelboards and loadcentersAll general purpose circuits
SAFETY■ 200,000 A.I.R. — Reliable interruption of all overcurrents
up to 200,000 amperes.■ Faster acting short circuit protection than any non-current
limiting mechanical protective device.
RELIABILITY■ Accurate and reliable — Automated, precision manufac-
tured and assembled parts ensure accurate, consistentresponse to overloads and short circuits.
Littelfuse FLNR/FLSR series fuses have been the superiorUL Class RK5 dual-element time-delay fuses, and are themost widely used class of fuses. FLNR/FLSR series fusesprovide excellent protection for all types of circuits especiallythose containing motors. However, users and specifiersshould consider the significant benefits offered by Indicatorfuses. Complete information on these fuses may be found inthis section of this catalog.
**
LONGER EQUIPMENT LIFE■ Reduced damage to equipment caused by heating
and magnetic forces of short circuits.■ Equipment runs cooler with low-resistance
dual-element fuses.
32
FLNR/FLSR Class RK5 Fuses250/600 VAC ■ Dual-Element, Time Delay ■ 1/10 – 600 Amperes
AF
EC
DG B
A
J
K
H
B
C
F D G
70-600AFIG. 1 FIG. 2
E
AMPERES
1/10 – 30
35 – 60
70 – 100
110 – 200
225 – 400
450 – 600
A B C D E F G H J K
DIMENSIONS IN INCHES (mm in parentheses)REFER TOFIG. NO.
SAFETY■ 200,000 A.I.R. — Reliable interruption of all overcurrents up
to 200,000 amperes.
■ Extremely current limiting — Stops damaging short-circuitcurrent faster than any mechanical protective device.
■ Fast-acting — Provides fast-acting protection to equipmentsuch as variable speed drives, rectifiers and other equip-ment containing surge-sensitive components.
LONGER EQUIPMENT LIFE■ Current-limiting design reduces damage to equipment
caused by heating and magnetic effects of short-circuitcurrents.
ECONOMICAL■ Extremely current-limiting — often permits use of readily
available, less costly equipment.
■ Used as input or output fuses for surge-sensitive compo-nents, such as variable speed drives and rectifiers, fast-acting KLNR/KLSR fuses may prevent opening of expen-sive semiconductor fuses protecting individual components.
EASY TO USE■ 200,000 A.I.R. rating minimizes need for short circuit
calculations.
DIMENSIONS■ Refer to FLNR for KLNR dimensions and FLSR for
KLSR dimensions.
KLNR/KLSR series RK1 fuses were the earliest type of current-limiting fuse developed. Their single-element, silverlink design enables them to provide fast-acting overload andshort-circuit protection. When used to protect inductive loadssuch as motors, solenoids, and transformers, KLNR/KLSRseries fuses must be greatly oversized to prevent opening thefuses on harmless inrush currents. In such applications,KLNR/KLSR series fuses may only provide short-circuit protection.
We recommend using POWR-PRO® LLNRK/LLSRK seriesRK1, dual-element, time-delay fuses in all new applicationsrequiring the current-limiting ability of UL Class RK1 fuses, orin existing applications where fast-acting RK1 or RK5 fuseshave been opening on harmless system surges such asmotor starting currents.
APPLICATIONSResistance heaters
Lighting circuits
Non-inductive loads
Molded case circuit breaker load centers and panelboardshave increased interrupting ratings when “series rated” withLittelfuse KLNR/KLSR Class RK1 fuses. Refer to panelboardmanufacturer’s literature for UL Listed combination of fusesand panelboards. Series ratings up to 200,000 amperes are available.
34
1000800600
400300
200
1008060
4030
20
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1.8.6
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0
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0010 20 30 40 60 80 100
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60A
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400A
600A
TIM
E IN
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ND
S
CURRENT IN AMPERES
1000800600
400300
200
1008060
4030
20
1086
43
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1.8.6
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200
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0
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0
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040
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6000
080
000
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0010 20 30 40 60 80 1005
30A
60A
100A
200A
400A
600A
TIM
E IN
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CURRENT IN AMPERES
2000
3000
4000
6000
8000
1000
0
2000
0
3000
040
000
6000
080
000
1000
00
2000
00100
200
300
400
600
800
1000
100
200
300400
600800
1000
2000
30004000
60008000
10000
20000
3000040000
6000080000
100000
200000
300000400000
600000800000
1000000
600A400A
200A
100A60A
30A
PE
AK
LE
T-T
HR
U IN
AM
PE
RE
S
AVAILABLE FAULT CURRENTSYMMETRICAL R. M. S. AMPERES
2000
3000
4000
6000
8000
1000
0
2000
0
3000
040
000
6000
080
000
1000
00
2000
00100
200
300
400
600
800
1000
100
200
300400
600800
1000
2000
30004000
60008000
10000
20000
3000040000
6000080000
100000
200000
300000400000
600000800000
1000000
600A400A
200A
100A
60A
30A
PE
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AVAILABLE FAULT CURRENTSYMMETRICAL R. M. S. AMPERES
NLN and NLS series fuses provide low cost protection forgeneral purpose feeder and branch circuits when availableshort circuit currents are less than 50,000 amperes. Theyreplace all Class H fuses which have only a 10,000 ampereinterrupting rating. They are suitable for use in many residen-tial and smaller commercial and industrial applications.
NLKP series fuses are Canadian “Code” fuses specificallydesigned to meet Canadian Electrical Code Type P fuse requirements for residential use. They have a 10,000 ampereinterrupting rating.
However, to obtain the added benefits of time-delay, current-limitation, and higher interrupting rating, consider the use ofPOWR-PRO® IDSR IndicatorTM fuses for circuits between250 and 600 volts. The user gets all the benefits of time-delayRK5 fuses plus the added benefits of an indicating fuse thattells when it has opened. Complete information on thesefuses may be found in the POWR-PRO® section of this catalog. For circuits up to 250 volts, see FLNR fuses in thissection of the catalog.
APPLICATIONSGeneral purpose residential and commercial circuits with little or no motor load.
Resistive heating loads.
ECONOMICAL■ For use in applications where lowest initial cost is the
major consideration.
SAFETY■ 50,000 A.I.R., Class K5 — Adequate interrupting capacity
NLKP: Standard 248-6, Class HUL Listed (File No: E81895)CSA Certified (File No: LR29865)Meets CSA “Type P” requirements
AMPERE RATINGS
NOTE: NLKP series fuses have limited interrupting rating andshould be used only where available short circuit current isknown to be less than the fuse interrupting rating. Whereavailable fault current is unknown, where it exceeds NLN/NLSinterrupting rating, or where it may increase in the future,200,000 ampere interrupting rating Littelfuse POWR-PROTM
FLNR_ID/FLSR_ID IndicatorTM fuses and FLNR/FLSR seriesfuses provide superior protection for all motor and generalpurpose circuits containing inductive loads.
RLN/RLS Class H Fuses250/600 VAC ■ Renewable ■ 1 – 600 Amperes
SPECIFICATIONSVoltage Ratings: AC: 250 Volts (RLN); 600 Volts (RLS)Interrupting Ratings: AC: 10,000 amperes rms symmetricalAmpere Range: 1 – 600 amperesApprovals: Standard 248-6, Class H
UL Listed (File No: E81895)CSA Certified (File No: LR29862)
FUSE LINKS: To order, specify LKN (250V) or LKS (600V)plus ampere rating shown below.
AMPERE RATINGS
Example part number (series & amperage): RLN 20
RECOMMENDED FUSE BLOCKSLH250 series (for RLN series fuses)LH600 series (for RLS series fuses)
Refer to Fuse Block section of this catalog for additional information.
Littelfuse RLN/RLS series renewable fuses are a qualityproduct that have traditionally been used to provide low costprotection of general purpose feeder and branch circuitswhere available short-circuit currents do not exceed 10,000amperes. However, generally increased levels of availablefault current and the distinct possibility that renewable fusesmay be improperly renewed, rendering them unsafe, have allbut eliminated the use of these fuses in new applications. Inaddition, escalating labor costs and increasing automation,which makes downtime very expensive, have greatly reducedor eliminated the cost savings attributed to renewable fuses.
We recommend the use of POWR-PRO® IDSR seriesIndicator™ fuses for circuits between 250 and 600 volts and FLNR series for 250 volt and below circuits. Complete information on POWR-PRO® Indicator fuses may be found in the POWR-PRO® section of this catalog. FLNR fuses arein this section of the catalog.
COST CONSIDERATIONS■ When comparing the cost of using renewable fuses with the
cost of other fuses, the labor required for replacing linksand the cost of additional downtime should be included.
CAUTIONS■ Renewable fuses should only be used where short circuit
currents are known to be less than 10,000 amperes, andwhere correct replacement of open links is assured.
■ After disassembly of fuse, examine carefully. Discard any fuses which show evidence of weakened tube or damaged components.
■ Remove all link residue from fuse tube.
■ Carefully clean all contact surfaces, and remove metalspatter from all surfaces.
■ Install the proper rated fuse link and tighten all connections securely.
■ Visually examine fuses for correct alignment of blades.
DIMENSIONS■ For dimensions, please refer to NLN series for RLN
dimensions and NLS series for RLS dimensions.
12345
681012 **15
2025303540
4550607080
90100110125150
175200225 *250 *300 *
350 *400 *450 *500 *600 *
*These ampere ratings require two links per fuse.**RLS Only.
Refer to Fuse Block section of this catalog for additional information.
LONGER EQUIPMENT LIFE■ Current-limiting design reduces damage to equipment
caused by heating and magnetic effects of short-circuitcurrents.
ECONOMICAL■ Extremely current-limiting design often permits use of
readily available, less costly equipment.
■ Manufacturers of equipment containing dual voltagedevices can simplify manufacturing and reduce inventoryby standardizing on 600 volt JLS fuses and Class J fuseblocks for all AC voltage ratings.
EASY TO USE■ 200,000 A.I.R. rating minimizes need for short-circuit
calculations.
NOTE: Littelfuse JLS fuses are not time-delay fuses. For applications where short-duration surges and spikes maycause nuisance fuse opening, consider the use of LittelfusePOWR-PRO® JTD series time-delay fuses.
JLS series fuses provide space-saving, fast-acting overloadand short-circuit protection for non-inductive loads. Whenused for motors or other inductive loads, the ampere rating of JLS series fuses must be increased to prevent nuisanceopening on inrush currents. In such applications, JLS fusesmay provide only short circuit protection. Consider usingLittelfuse POWR-PRO® JTD series time-delay fuses in such circuits.
APPLICATIONSGeneral purpose circuits with little or no motor load.
Resistive loads, such as resistance electric heat.
Loads requiring fast-acting overload protection, such asequipment containing solid-state devices.
SPACE SAVING■ JLS fuse characteristics are similar to KLNR/KLSR fast-
acting Class RK1 fuses, but they are much smaller.
SAFETY■ 200,000 A.I.R. — Reliable interruption of all overcurrents up
to 200,000 amperes.
■ Extremely current limiting — Stops damaging short-circuitcurrent faster than any mechanical protective device.
■ Fast-acting — Provides fast-acting protection to equipmentsuch as variable speed drives, rectifiers and other equip-ment containing surge-sensitive components.
RECOMMENDED FUSE BLOCKSLT300 series (for JLLN series fuses) LT600 series (for JLLS series fuses)
Refer to Fuse Block section of this catalog for additional information.
■ Extremely current limiting — Stops damaging short circuitcurrent faster than any mechanical protective device.
■ Fast-acting — Provides fast-acting overload protection toequipment such as variable speed drives, rectifiers andother equipment containing surge-sensitive components.
LONGER EQUIPMENT LIFE■ Current limiting design greatly reduces damage to equip-
ment caused by heating and magnetic effects of short circuit currents.
ECONOMICAL■ Extremely current limiting design often permits use of
readily available, less costly equipment.
■ Used as input or output fuses for surge-sensitive compo-nents, such as variable speed drives and rectifiers, fast-acting POWR-T JLLN/JLLS fuses may prevent opening of expensive semiconductor fuses protecting individual components.
NOTE: JLLN Class T 300 volt fuses are UL listed for circuitsnot exceeding 300 volts to ground. However, since UL doesnot include testing 300 volt Class T fuses on 277/480 voltthree-phase bolted faults, Littelfuse does not recommendusing 300 volt Class T fuses where phase-to-phase voltageexceeds 300 volts.
Space saving POWR-T™ fuses are the most compact fusesavailable in ratings above 30 amperes — less than one-thirdthe size of comparable Class R fuses. When rated in accor-dance with the NEC, POWR-T fuses provide fast-actingoverload and short circuit protection for non-inductive circuitsand equipment. Used in inductive circuits, the ampere ratingof POWR-T fuses must be increased to prevent opening oninrush currents. In such instances, POWR-T fuses may provide only short circuit protection.
For motor and general purpose circuits where space is notcritical, we recommend POWR-PRO® JTD_ID Indicatorseries, LLNRK/LLSRK series, or FLSR_ID Indicator series.
APPLICATIONSProtection of individual electric services and meters.
Main switches containing Class T fuses may be used to provide compact protection for meter stacks.
Molded case circuit breaker load centers and panelboardshave increased interrupting ratings when “series rated” withLittelfuse Class T fuses. Refer to panelboard manufacturers’literature for UL Listed combination of fuses and panelboards.Series ratings up to 200,000 amperes are available.
SPACE-SAVINGTypical three-pole Class T fuse blocks require less than 50%of the panel area required for Class R fuse blocks. Switchenclosures, fuse pullouts, and other equipment using Class Tfuses are often correspondingly more compact.
SAFETY■ 200,000 A.I.R. — Reliable interruption of all overcurrents up
to 200,000 amperes.
41
JLLN/JLLS POWR-T™ Class T Fuses300/600 VAC ■ Fast-Acting ■ 1 – 1200 Amperes
JLLN/JLLS POWR-T™ Class T Fuses300/600 VAC ■ Fast-Acting ■ 1 – 1200 Amperes
1000800600
400300
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008 10 20 30 40 60 80 1005
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800A
1200
A
TIM
E IN
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1000800600
400300
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1008060
4030
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1086
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0
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008 10 20 30 40 60 80 1005
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TIM
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CURRENT IN AMPERES
2000
3000
4000
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8000
1000
0
2000
0
3000
040
000
6000
080
000
1000
00
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00100
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300400
600800
1000
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30004000
60008000
10000
20000
3000040000
6000080000
100000
200000
300000400000
600000800000
1000000
1200A800A600A400A
200A
100A
60A30A
PE
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AVAILABLE FAULT CURRENTSYMMETRICAL R. M. S. AMPERES
2000
3000
4000
6000
8000
1000
0
2000
0
3000
040
000
6000
080
000
1000
00
2000
00100
200
300
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100
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300400
600800
1000
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30004000
60008000
10000
20000
3000040000
6000080000
100000
200000
300000400000
600000800000
1000000
800A600A
400A
200A
100A60A
30A
PE
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AVAILABLE FAULT CURRENTSYMMETRICAL R. M. S. AMPERES
JLLSJLLN
JLLSJLLN
43
SLC Class G Fuses480 VAC, 600 VAC ■ Medium Time-Delay ■ 1/2 – 60 Amperes
The unique design of Littelfuse’s compact SLC series ClassG fuses provide additional time-delay over competitive prod-ucts which increases system reliability.Compact Class G fuses were the first fuse series toapproach midget fuse dimensions and meet NEC require-ments for branch-circuit protection. The unique dimensionsof SLC series Class G fuses prevents insertion of lower volt-age fuses in Class G fuse holders. The fuse’s varying lengthprevents insertion of higher ampere rated fuses in fuse holders designed for lower ampere ratings.Class CC fuses are replacing Class G fuses in many newdesigns. Class CC fuses’ superior time delay plus highervoltage and interrupting ratings meet the needs of moderncircuits. Littelfuse’s introduction of POWR-PRO® CCMRseries fuses, with ratings up to 60 Amperes for providingbranch circuit protection, are accelerating this trend. Com-plete information on POWR-PRO® CCMR series fuses maybe found in the POWR-PRO® section of this catalog.
SAFETY■ 100,000 A.I.R. — Reliable interruption of all overcurrents
up to 100,000 amperes.■ Current limiting design reduces damage to equipment
caused by heating and magnetic effects of short circuitcurrents.
■ Medium time-delay allows fuses to be sized closer to actual equipment requirements — no need to greatly over-size to withstand harmless equipment or system surges.
REDUCED DOWNTIME■ Medium time-delay may reduce downtime caused by
power surges or equipment demands.NOTE: For applications where greater time delay is required,or where ratings exceed 60 amperes, consider selectingLittelfuse time-delay RK1, RK5, or Class J fuses.
SPECIFICATIONSVoltage Ratings: 600Volts AC (1/2 – 20A)
480 Volts AC (25 – 60A)Interrupting Ratings: 100,000 amperes rms symmetricalAmpere Range: 1/2 – 60 amperesApprovals: Standard 248-5, Class G
UL Listed (File No: E81895)CSA Certified (File No: LR29862)QPL: Federal Specification No: WF-1814
Approvals: AC: Standard 248-4, Class CCUL Listed 1/10-30 Amps (File No: E81895)Standard 248, Class CDUL Listed 35-60 Amps (File No: E71611)CSA Certified 1/10-60 Amps (File No: LR29862)
DC: Littelfuse Self-certified
RECOMMENDED FUSE BLOCKSL60030C series L60060C series (for CCMR 35–60A)
Refer to Fuse Block section of this catalog for additional information.
Compared to other UL Listed fuses, Class CC fuses are themost current limiting, rating for rating. Because they arephysically compact, they provide this superior protection in afraction of the space required by other fuse classes. Forexample, when 600V three-pole, 30 ampere Class R fuseblocks are replaced by Littelfuse Class CC fuse blocks, panelmounting space is reduced approximately 70%. This isespecially important when a panel contains many fuses toprotect multiple circuit components.
APPLICATIONSThree Types of Class CC Fuses, Specifically Designedto Protect Different Types of Components1) Motor protection — CCMR series; dual-element, time-delay fuses specifically designed to protect motor circuitsup to 40 HP**.2) Small transformer protection (control power transformers) — KLDR series, time-delay fuses designedto withstand the high magnetizing inrush of transformers.3) General purpose protection of equipment requiringfast overload protection — KLKR series, fast-acting fuses used for protection of equipment containing solid-state devices or other electronic components requiring fastresponse on overloads.
SAFETY■ 200,000 A.I.R. — Reliable interruption of all overcurrents up
to 200,000 amperes.■ Extremely current limiting — Reduces damage caused by
heating and magnetic effects of short-circuit currents . . .stops damaging short-circuit currents faster than any mechanical protective device.
SPACE SAVING■ Class CC fuses are the smallest 600V, 200,000 A.I.R. fuses
approved for branch circuit protection.
ECONOMICAL■ Current limiting design often permits use of readily avail-
able, less costly equipment.
1.50"(38.1 mm)
.50"(12.7 mm)
.41"(10.3 mm)
.25"(6.4 mm)
.125"(3.2 mm)
0-30A
**Consult the Motor Protection Tables in the Fuseology section for specific motor sizing information
†Refer to the POWR-PRO® section for additional information.
35-60A
45
For space-saving protection of motor circuits up to 40 HP**, we recommendLittelfuse POWR-PRO® CCMR seriesfuses. These fuses are the only truedual-element time-delay CC fusesspecifically engineered for motor branchcircuit protection. They provide Type IIprotection (no damage) to both NEMA-rated and the more sensitive IEC(International Electromechanical Com-mission) type motor circuit components.CCMR series fuses are now available inlarger sizes — from 35 to 60 amperes!No other 600V fuse is available withthis current carrying capacity in apackage this small.
For more information on CCMR seriesClass CC fuses, see the CCMR seriespages in the POWR-PRO® section ofthis catalog.1/10 – 30A: UL Listed Time-Delay
Class CC 35 – 60A: UL Listed Class CD
KLDR fuses are time-delay fuses specif-ically designed for the protection of con-trol transformers, solenoids and similarinductive components with high magne-tizing currents during the first half-cycle.They closely match most control powertransformer characteristics, which per-mits the fuses to be sized in accordancewith the latest revisions of UL 508(Industrial Control) and UL 845 (MotorControl Centers). When the time delayof KLDR fuses is adequate to carrymotor starting current, they provide ex-cellent protection of motor branch cir-cuits containing IEC or NEMA ratedmotor controllers or contactors.
KLKR series Class CC fuses are fast-acting fuses intended for general pur-pose branch circuit protection. Theircompact size, fast-acting overloadresponse, and their highly current limit-ing design make them ideal for use inOEM equipment and control panels.Solid-state devices such as SCRs andother electronic equipment generallyrequire fast-acting protection.
Example part number (series & amperage): KLDR 5 6⁄10
DESCRIPTIONEdison-base plug fuses (WOO, TOO, and TLO series) havethreaded metal shells and contacts similar to incandescentlamp bases. Fuseholders for Edison-base fuses havematching metal threads similar to standard light sockets.Type S fuses (SLO and SOO series) have nonmetallicthreaded bases which fit matching nonmetallic threads inType S fuseholders. Type S fuseholders are size-limiting, andwill not accept Type S fuses with ampere ratings greater thanthe ampere rating marked on the Type S fuseholder. Type Sfuses will not fit Edison-base fuseholders, nor can Edison-base fuses be used in Type S fuseholders.Approvals: Standard 248-11, UL Listed Plug FusesNote: Although rated at 125 volts, NEC permits plug fuses tobe used in circuits not exceeding 150 volts to ground. SeeNEC Article 240-E.
HOLDERSSee Littelfuse box cover units in the Miscellaneous Productssection of this catalog.
SAO Type S Fuse Adapters inserted into Edison-base fuseholders permanently convert them to Type S fuseholders.They accept Type S fuses only.
APPLICATIONSThe National Electric Code now permits Edison-base fuses tobe used only for replacements in existing installations, andthen, only when there is no evidence of overfusing or tampering. All new Edison-base fuseholders must have TypeS fuse adapters installed before they are placed in service.Designed to prevent installation of wrong size fuses, Type SAdapters (SAO series) screw into Edison-base fuseholders sothey may accept Type S fuses. Once installed the adapterscannot be removed.To prevent shunting of open fuses or overfusing, and toreduce nuisance fuse opening, it is recommended that SAOadapters with properly rated SLO or SOO series fuses beinstalled in all Edison-base fuseholders.
TYPE S PLUG FUSES
SOO Fuses are dual-element time-delay Type S fuses designed for motorand motor branch-circuit protection;also suitable for all general-purposecircuits.
TOO Fuses are dual-element time-delay Edison-base fuses designed formotor and motor branch-circuit protection; also suitable for all general-purpose circuits. Use for replacementpurposes only.
WOO Fuses are non-delay Edison-base fuses, best suited for incandes-cent lighting, resistance heating, andgeneral purpose circuits with no significant motor load. Not recom-mended for motor circuits. See TOOand SOO fuses. Use for replacementpurposes only.
AMPERE RATINGS1⁄2 2 5 8 15 251 3 6 10 20 30
EDISON-BASE PLUG FUSES
TLO Fuses are medium time-delayEdison-base fuses designed for general-purpose branch-circuit protection. See TOO and SOO fusesfor motor protection. Use for replace-ment purposes only.
AMPERE RATINGS15 20 25 30
SLO Fuses are medium time-delayType S fuses for general-purposebranch-circuit protection.
