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Smaller Footprint Higher Voltage Options– Cartridge Fuse

May 2011

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Agenda

High Voltage Cartridge Fuse

– Portfolio Overview

– Fuse Selection Guide

– New Product Development Strategy

– Application Guide

RTMs: 477 series, 505 series, 506 series, 508 series and

etc.

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Cartridge Fuse Portfolio Overview

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Fuse Selection Guide

Selection Factors– Normal operation current

– Application voltage (AC or DC) – Voltage Rating

– Maximum available fault current – Interrupting Rating

– Overload current and length of time in which the fuse must open

– Pulse, Surge Currents, Inrush Currents, Start-up Currents and Circuit Transients

– Ambient temperature

– Physical size limitations, e.g. length, diameter, or height

– Agency Approvals required, e.g. UL, CSA, VDE, METI and etc

– Fuse features (mounting type/form factor, ease of removal, axial leads, visual indication, etc.)

– Fuse-holder features, if applicable and associated rerating (clips, mounting block, panel mount, PC board mount, etc.)

– Application testing and verification prior to production

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Terms-- Voltage Rating and Interrupting Rating

What will happen if we select a wrong fuse?

250Vac Rated Fuse Tested at 400Vdc

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Cartridge New Product Strategy-- Higher energy in a smaller body

Product Release Date Valued Proposition Application

208/209 series 350V-rated 2AG

2008 Alternative to Belfuse. Ballast

215 series High Rating 15A - 20A

20081st to market on 20A. Smallest footprint available.

Power Supplies, White Goods, Telecom

505 series 450V/500Vdc 2009High BC of 50kA@500Vac and 20kA@500Vdc.

High End UPS, Industrial controls

477 series 600Vac/400Vdc 5x20 2009Smaller footprint for 400V above 8A

3-phase Power Supplies, Ballast, Air-conditioner, LCD

977 series450Vdc LBC 5x20

2010 1st to market for 450Vdc 5x20 Network Storage, Servers

506 series 600Vdc HBC 6x32mm (15A - 20A)

2010 Smaller footprint 6x32 vs 10x38 Solar Energy Applications

508 series1000V HBC 6x32mm (<1A)

2010Smallest footprint at 6x32 vs 10x38

Multimeter

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Applications for the 477 series-- 600VAC/400VDC 5x20mm Slo-Blo® Type Fuse

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Application for 477 series-- Ballast

*477series 600Vac in Ballast Application : 600Vac-rated fuse for Industrial Ballast (for working voltage 480Vac to 600Vac).

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0477001P

04773.15P

0477016P, 3PCS each set

Application for 477 series-- Air-conditioner

*477series 600Vac in Air-conditioner Application: 600Vac-rated fuse for Air-conditioner(for working voltage less than 500Vac).

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•Higher Voltage Output Combined with the Need for High Efficiency Power Supplies:

Due to the combined demand for higher output voltages and High efficiency Power Factor Correction (PFC) Switch Mode Power Supplies (SMPS) there is an increasing need for a higher DC voltage rated Fuse. Increase in demand for high efficiency White Goods, HVAC equipment, ARC Welders and Fluorescent Lighting and many more High Voltage applications has driven the need for our 477 Series (3AB) Fuse.

•Our insatiable quest for a bigger and better Audio Visual experience.

When a TV panel goes beyond 32 inches, the CCFL (cold cathode fluorescent) backlighting is driven directly from the 400VDC. Another example of the demand for higher voltages and energy efficiency. The larger the panel the more voltage required and energy consumed!!!

Socket Name

Fuse Used Currently

Market Driver

Technical Why and Why Not

400VDC Cartridge and Radial lead fuse

Ex. 5x20mm

PFC for higher power efficiency

PFC output voltage at 380 to 400DC for a input of 90 to 240 AC. Since the AC could rated up to 264 V, the voltage rating of the components on the PFC line are rated at least 380Vdc or higher.

Application for 477 series-- LCD TV

Market Background

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Note: For power saving purpose, there are increasing needs for Standby Circuit protection.

CCFL

220VAC

CCFL InverterDriver

PWM , IsoDC / DC Step Down

24VDC

12VDC

12 VDC

DC/ DC

LCD Driver ICs

Timing Circuits

DC/ DC Stand by Circuit

12 VDC

24 VDC

Application for 477 series-- LCD TV (cont)

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Application for 477 series-- LCD TV (cont)

OC Protection of HV DC Bus

Design Notes:

Protection Application: For the SMPS, after the PFC circuit, there is a 400VDC bus, due to impedance of the PFC circuitry, when there is a abnormal condition at the 400VDC bus, there is a threat of thermal event for the PFC circuit and the DC to DC circuitry.

Solution Description: As shown at the left, a 400V to 450V high breaking capacity DC fuse can be used for short circuit and overload current conditions. LF provide 477 series for the protection. The 477 comes in a 5x20mm package.

Companion Solutions: N/A

Regulatory Issues: UL Recognized pending.

Unique Features: Does not apply.

Application Warnings: Caution must be taken for the breaking capacity of the fuses when apply a 250V AC fuse at this application.

PFC 12 to 24V DC

PWM, Iso, Step Down

400V DC Fuse

CCFL InverterCircuits

PFC 400VDC Fuse

Circuits for Larger LCD TV

Circuits for Smaller LCD TV

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Applications for the 505, 506 and 508 series-- 500V, 600V and 1000V 6x32mm fuse

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Application for 508 series-- Multi-meter

10x38 Midget 1000V Fuse

6x32 Ceramic 1000V Fuse

- Smaller foot-print (6x32mm) fuse relative to the existing 10x38mm fuse- Total LF package fuse solution for both 10X38 FLU and 6.3X32 508 series fuse.

*508 series 1000Vac/Vdc in Multi-meter Application : 1000Vac/Vdc 315mA and 500mA

Multi-Meter Category:Category I: used where current levels are low. Category II: used on residential branch circuits. Category III: used on permanently installed loads such as distribution panels, motors, and appliance outlets. Category IV: used on locations where current levels are high, such as service entrances, main panels, and house meters.

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Application for 505 series

*505 series 500Vac and Vdc in Applications of:• 3 Phase Power Supply• UPS• Solar Inverter

Platform: 2.8KW On-Grid Solar InverterApplication: AC Output Over Current ProtectionFuse Part number: 0505016.MXPFuse Clip Part number: 01020078HNote: Customer using 0505016 due to On-Grid power line voltage may go above 264 Volts.

Platform: 2.8KW On-Grid Solar InverterApplication: DC Input Over Current ProtectionFuse Part number: 0505020.MXPFuse Clip Part number: 01020078HNote: Customer using 0505020 .MXP on the DC input for 500VDC Input Over Current Protection

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Application for 505 and 506 series-- Solar Energy Application

Combiner Box

Inverter

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Product 505 Fuse Series 450VDC/500VDC 10 – 30 amperes 6 X 32 mm 20,000 amperes B/C@450VDC/500VDC

Application for 505 and 506 series-- Solar Energy Application

Product 506 Fuse Series 600VDC 15 – 20 amperes 6 X 32 mm 10,000 amperes B/C@600VDC