Square D Coordinating Breakers

Data Bulletin 0100DB0902 R06/1308/2013Replaces 0100DB0902R04/11, 04/2011

Guide to Low Voltage Transformer Protection and Selective CoordinationRetain for future use.

20112013 Schneider Electric All Rights Reserved

Introduction Use this guide for selecting transformer primary circuit breaker, secondary circuit breaker and the largest branch circuit breakers for total selective coordination. The circuit breaker selections conform to the NEC Article 450 requirements for transformer protection while providing total selectivity for the circuits.

See How To Use This Guide, on page 3, for additional information.

Use the Guidelines below for tips on working through systems for selective coordination.

NOTE: It is still necessary to perform an engineering study to determine the specific requirements of each system.

Guidelines

Know Your State and Municipal Code Understand your state and local municipalitys adoption and enforcement regarding the National Electrical Code (NEC). Part of understanding local code adoption and enforcement is understanding the threshold of selective coordination required0.1s (TCCs) or total, for the full operating range of the protective devices (which typically uses look-up tables). This guide assumes total selective coordination is required.

Lighting Panelboard Recommendations In general, do not feed lighting panelboards from other lighting panelboards unless there is a transformer in between them.

Better levels of selective coordination are available with 225 A and larger panelboards.

Consider using main lugs panelboards.

Bottom-Up Coordination When selectively coordinating a system, work from the loads towards the source(s), coordinate the branch panels first, then the power distribution panels, then the switchboard or switchgear.

Sizing Upstream Circuit Breakers The upstream circuit breaker should be at least one frame size larger than the downstream circuit breaker. This may necessitate increasing the size of panelboards and feeder conductors.

Very high levels of short circuit selective coordination may be achieved by using high ampere frame electronic trip circuit breakers with low ampere sensors and/or lower ampere rating adjustments.

Overlapping Time Current Curves (TCCs) When there is no overlap (at any point) of the TCCs below the available short circuit current at the downstream panel, the circuit breakers are fully coordinated.

When there is overlap in the short circuit zone, use the short circuit selective coordination tables in document number 0100DB0501, Short Circuit Selective Coordination for Low Voltage Circuit Breakers or

Guide to Low Voltage Transformer Protection and Selective Coordination 0100DB0902 R06/13Data Bulletin 08/2013

20112013 Schneider Electric All Rights Reserved2

document number 0100DB0604, Selectivity Guidelines for Square D Panelboards.

Automatic Transfer Switch (ATS) Withstand Ratings

Make sure automatic transfer switches have adequate withstand ratings.

It may be necessary to relocate the switch, or It may be necessary to increase the size of the switch.

Mixing of Overcurrent Protective Devices (OCPD)

Time-Current Curves (TCC) may be used so long as the fault current does not exceed the instantaneous trip point of the upstream breaker

OCPD from different manufacturers or different types cannot be mixed if the fault current is outside of the parameters describe above.

Arc Flash Incident Energy Consider how selective coordination impacts the arc flash Protective Personnel Equipment (PPE) levels.

It may be possible to reduce arc flash incident energy with Zone Selective Interlocking (ZSI).

Nesting Time-Current Curves The time-current curve of a thermal magnetic circuit breaker can sometimes be nested underneath the time-current curve of an upstream electronic trip circuit breaker.

Circuit Breaker Withstand Capacity Molded case circuit breakers (UL 489) used for coordination:

New H frame (U) with Micrologic trip unit

New J-Frame (W) circuit breakersselectively coordinate up to 18kA with 240/120V Circuit Breakers

New L-Frame (W) circuit breakersselectively coordinate up tp 30kA with 240V and 480Y/277V

LA/LH MC (mission critical) circuit breakerselectively coordinate up to 22 kA with 120 V circuit breakers (obsolete)

D-Frame MC (mission critical) circuit breakerselectively coordinate up to 30 kA with 120 V circuit breakers (obsolete)

PowerPact PG/PK and RG/RK circuit breakersselectively coordinate up to 65 kA with 277 V Circuit Breakers

Masterpact NW circuit breakersselectively coordinate up to 100 kA with larger molded case circuit breakers

Refer to 0100DB0501 for complete, total selectivity tables.

Field Adjustment Do not neglect to properly adjust circuit breakers in the field as all Square D low voltage circuit breakers are shipped from the factory with all but the ampere-rating switch in the lowest position.

As a Last Resort . . . Change the upstream circuit breaker type to an insulated case circuit breaker or a low voltage power circuit breaker.

Reduce the voltage if the desired level of selective coordination cannot be achieved using a 480Y/277 Vac panelboard. Consider feeding a 208Y/120 Vac panelboard through a transformer.

Split up some of the loads and use multiple smaller transformersavoid feeding a 100 A/208 V panel from another 208 V panel.

Insert impedance through longer run of wire or higher impedance transformers or reactors.

0100DB0902 R06/13 Guide to Low Voltage Transformer Protection and Selective Coordination08/2013 Data Bulletin

20112013 Schneider Electric All Rights Reserved 3

How To Use This Guide 1. Determine the available fault current on primary side of transformer and choose the appropriate reference table.

a. 35 kA/18 kA b. 65 kAc. 100 kA

2. Locate the transformer size on far left of chart. Options are available up to 225 kVA.

3. Based on the specification requirement for aluminum or copper transformer windings, read the available circuit breaker combinations for primary, secondary (main), and branch circuit breakers for a selectively coordinated system.

4. Choose the circuit breaker combination that best suits your system requirements.

a. The primary circuit breaker should be selected as the device feeding the transformer, whether in a panelboard or circuit breaker enclosure.

b. The secondary circuit breaker should be selected as the main circuit breaker in the panelboard downstream of the transformer; or optionally, could be mounted in a circuit breaker enclosure to feed a main lugs only panelboard.

c. The branch circuit breakers are listed to show the maximum size that can be applied to a full selectively coordinated system. Additionally, notation is made to present which style of QO(B) circuit breaker is required based on current rating and number of poles.

5. Reference data bulletin 0100DB0501 if additional circuit breaker selections are required upstream from the primary circuit breaker to complete the system. This data bulletin is a comprehensive resource for selectively coordinated circuit breaker combinations within the same voltage system.



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Sele

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oord

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Com

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(35

kA)

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Tabl

e1:

Sele

ctiv

e C

oord

inat

ion

Dev

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Com

bina

tions

(35

kA)

AB

CD



Tran

sfor

mer

P

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Sec

onda

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me

Size

kVA

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517

5 A

4

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100

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517

5 A

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5(0

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e ob

sole

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Con

tinue

d on

nex

t pag

e

Tabl

e1:

Sele

ctiv

e C

oord

inat

ion

Dev

ice

Com

bina

tions

(35

kA)

AB

CD



Tran

sfor

mer

P

rimar

y C

ircui

t Bre

aker

Sec

onda

ry C

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aker

Bra

nch

Circ

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Long

Tim

eS

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Sho

rt Ti

me

Size

kVA

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rpos

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ped

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e ob

sole

te.

Con

tinue

d on

nex

t pag

e

Tabl

e1:

Sele

ctiv

e C

oord

inat

ion

Dev

ice

Com

bina

tions

(35

kA)

AB

CD



Tran

sfor

mer

P

rimar

y C

ircui

t Bre

aker

Sec

onda

ry C

ircui

t Bre

aker

Bra

nch

Circ

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Long

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rt Ti

me

Size

kVA

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pe

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ped

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anch

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and

L-M

C c

ircui

t bre

aker

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e ob

sole

te.

Con

tinue

d on

nex

t pag

e

Tabl

e1:

Sele

ctiv

e C

oord

inat

ion

Dev

ice

Com

bina

tions

(35

kA)

AB

CD



Tran

sfor

mer

P

rimar

y C

ircui

t Bre

aker

Sec

onda

ry C

ircui

t Bre

aker

Bra

nch

Circ

uit B

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for

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l Sel

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Long

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hort

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rt Ti

me

Size

kVA

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rpos

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pe

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ped

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Z)1

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ker

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ze /

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A

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anch

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ze5

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A

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100

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015

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100

A

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015

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112.

5

Alu

min

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2

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3.

225

017

517

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12

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3.3

400

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4

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5.

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225

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100

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4

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410

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per

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3.9

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225

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4

12

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410

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3.

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017

517

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10

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3.3

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4

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150

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400

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410

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600/

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(B)-V

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O(B

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JG_U

5.

2/6.

225

017

517

54

100

10

LD_W

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400

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4

12

150

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400

410

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QO

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QO

(B)-V

HQ

O(B

)Q

O(B

)-VH

D-M

C*

600/

400

300

400

(0.8

)(0.9

5)16

15

0Q

O(B

)Q

O(B

)Q

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

LA/L

H

MC

400

200

LD_W

3.3

400

400

400

4

12

150

QO

(B)

QO

(B)

QO

(B)-V

HQ

O(B

)Q

O(B

)-VH

LD_W

3.3

S40

040

040

0

10

1215

0Q

O(B

)Q

O(B

)Q

O(B

)-VH

QO

(B)

QO

(B)-V

HLD

_W

5.3/

6.3

400

400

400

410

012

150

QO

(B)

QO

(B)

QO

(B)-V

HQ

O(B

)Q

O(B

)-VH

D-M

C*

600/

400

300

400

(0.8

)(0.9

5)16

15

0Q

O(B

)Q

O(B

)Q

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

* N

OTE

: D-M

C a

nd L

-MC

circ

uit b

reak

ers

are

obso

lete

.C

ontin

ued

on n

ext p

age

Tabl

e1:

Sele

ctiv

e C

oord

inat

ion

Dev

ice

Com

bina

tions

(35

kA)

AB

CD



Tran

sfor

mer

P

rimar

y C

ircui

t Bre

aker

Sec

onda

ry C

ircui

t Bre

aker

Bra

nch

Circ

uit B

reak

ers

for

Tota

l Sel

ectiv

e C

oord

inat

ion

Long

Tim

eS

hort

Tim

eLo

ng T

ime

Sho

rt Ti

me

Size

kVA

Gen

eral

Pu

rpos

e Ty

pe

Cat

alog

N

umbe

rs

Min

. Im

ped

-anc

e (%

Z)1

Circ

uit

Brea

ker

Fram

e8

Fram

e Si

ze /

Rat

ing

A

Ampe

re

Rat

ing2

ASe

tting

Del

aySe

tting

Del

ayIn

stan

t-an

eous

Circ

uit

Brea

ker

Type

(M

ain)

Fram

e Si

ze /

Rat

ing

Ampe

re

Rat

ing2

(A)

Min

. Se

tting

sM

in.

Del

aySe

tting

Del

ayIn

stan

t-an

eous

Max

. Br

anch

Si

ze5

(A)

1P15

70

A

2P15

100

A

2P11

015

0A

3P15

100

A

3P11

015

0A

150

Alu

min

umEE

150T

3H6.

0

LG_U

3.

340

022

522

54

10

LD_W

3.3

600

600

600

2

11

150

QO

(B)

QO

(B)

QO

(B)-V

HQ

O(B

)Q

O(B

)-VH

LD_W

3.3

S60

060

060

0

5

1115

0Q

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)Q

O(B

)Q

O(B

)-VH

QO

(B)

QO

(B)-V

HLD

_W

5.3/

6.3

600

600

600

25

011

150

QO

(B)

QO

(B)

QO

(B)-V

HQ

O(B

)Q

O(B

)-VH

D-M

C*

600

600

(1)(

1)2

150

QO

(B)

QO

(B)

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

H

LG_U

3.

3S40

022

522

5

10

10

LD_W

3.3

600

600

600

2

11

150

QO

(B)

QO

(B)

QO

(B)-V

HQ

O(B

)Q

O(B

)-VH

LD_W

3.3

S60

060

060

0

5

1115

0Q

O(B

)Q

O(B

)Q

O(B

)-VH

QO

(B)

QO

(B)-V

HLD

_W

5.3/

6.3

600

600

600

25

011

150

QO

(B)

QO

(B)

QO

(B)-V

HQ

O(B

)Q

O(B

)-VH

D-M

C*

600

600

(1)(

1)2

15

0Q

O(B

)Q

O(B

)Q

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

LG_U

5.

3/6.

340

022

522

54

100

10

LD_W

3.3

600

600

600

2

11

150

QO

(B)

QO

(B)

QO

(B)-V

HQ

O(B

)Q

O(B

)-VH

LD_W

3.3

S60

060

060

0

5

1115

0Q

O(B

)Q

O(B

)Q

O(B

)-VH

QO

(B)

QO

(B)-V

HLD

_W

5.3/

6.3

600

600

600

25

011

150

QO

(B)

QO

(B)

QO

(B)-V

HQ

O(B

)Q

O(B

)-VH

D-M

C*

600

600

(1)(

1)2

15

0Q

O(B

)Q

O(B

)Q

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

LA/L

H

MC

400

225

LD_W

3.3

600

600

600

2

11

150

QO

(B)

QO

(B)

QO

(B)-V

HQ

O(B

)Q

O(B

)-VH

LD_W

3.3

S60

060

060

0

5

1115

0Q

O(B

)Q

O(B

)Q

O(B

)-VH

QO

(B)

QO

(B)-V

HLD

_W

5.3/

6.3

600

600

600

25

011

150

QO

(B)

QO

(B)

QO

(B)-V

HQ

O(B

)Q

O(B

)-VH

D-M

C*

600

600

(1)(

1)2

15

0Q

O(B

)Q

O(B

)Q

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

Cop

per

EE15

0T3C

U4.

7

LG_U

3.

340

022

522

54

12

LD_W

3.3

600

600

600

2

11

150

QO

(B)

QO

(B)

QO

(B)-V

HQ

O(B

)Q

O(B

)-VH

LD_W

3.3

S60

060

060

0

5

1115

0Q

O(B

)Q

O(B

)Q

O(B

)-VH

QO

(B)

QO

(B)-V

HLD

_W

5.3/

6.3

600

600

600

25

011

150

QO

(B)

QO

(B)

QO

(B)-V

HQ

O(B

)Q

O(B

)-VH

D-M

C*

600/

600

600

(1)(

1)2

15

0Q

O(B

)Q

O(B

)Q

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

LG_U

3.

3S40

025

025

0

10

12

LD_W

3.3

600

600

600

2

11

150

QO

(B)

QO

(B)

QO

(B)-V

HQ

O(B

)Q

O(B

)-VH

LD_W

3.3

S60

060

060

0

5

1115

0Q

O(B

)Q

O(B

)Q

O(B

)-VH

QO

(B)

QO

(B)-V

HLD

_W

5.3/

6.3

600

600

600

25

011

150

QO

(B)

QO

(B)

QO

(B)-V

HQ

O(B

)Q

O(B

)-VH

D-M

C*

600/

600

600

(1)(

1)2

15

0Q

O(B

)Q

O(B

)Q

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

LG_U

5.

3/6.

340

025

025

04

100

12

LD_W

3.3

600

600

600

2

11

150

QO

(B)

QO

(B)

QO

(B)-V

HQ

O(B

)Q

O(B

)-VH

LD_W

3.3

S60

060

060

0

5

1115

0Q

O(B

)Q

O(B

)Q

O(B

)-VH

QO

(B)

QO

(B)-V

HLD

_W

5.3/

6.3

600

600

600

25

011

150

QO

(B)

QO

(B)

QO

(B)-V

HQ

O(B

)Q

O(B

)-VH

D-M

C*

600/

600

600

(1)(

1)2

15

0Q

O(B

)Q

O(B

)Q

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

LA/L

H

MC

400

225

LD_W

3.3

600

600

600

2

11

150

QO

(B)

QO

(B)

QO

(B)-V

HQ

O(B

)Q

O(B

)-VH

LD_W

3.3

S60

060

060

0

5

1115

0Q

O(B

)Q

O(B

)Q

O(B

)-VH

QO

(B)

QO

(B)-V

HLD

_W

5.3/

6.3

600

600

600

25

011

150

QO

(B)

QO

(B)

QO

(B)-V

HQ

O(B

)Q

O(B

)-VH

D-M

C*

600/

600

600

(1)(

1)2

15

0Q

O(B

)Q

O(B

)Q

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

* N

OTE

: D-M

C a

nd L

-MC

circ

uit b

reak

ers

are

obso

lete

.C

ontin

ued

on n

ext p

age

Tabl

e1:

Sele

ctiv

e C

oord

inat

ion

Dev

ice

Com

bina

tions

(35

kA)

AB

CD



Tran

sfor

mer

P

rimar

y C

ircui

t Bre

aker

Sec

onda

ry C

ircui

t Bre

aker

Bra

nch

Circ

uit B

reak

ers

for

Tota

l Sel

ectiv

e C

oord

inat

ion

Long

Tim

eS

hort

Tim

eLo

ng T

ime

Sho

rt Ti

me

Size

kVA

Gen

eral

Pu

rpos

e Ty

pe

Cat

alog

N

umbe

rs

Min

. Im

ped

-anc

e (%

Z)1

Circ

uit

Brea

ker

Fram

e

Fram

e Si

ze /

Rat

ing

A

Ampe

re

Rat

ing2

ASe

tting

Del

aySe

tting

Del

ayIn

stan

t-an

eous

Circ

uit

Brea

ker

Type

(M

ain)

Fram

e Si

ze /

Rat

ing

Ampe

re

Rat

ing2

(A)

Min

. Se

tting

sM

in.

Del

aySe

tting

Del

ayIn

stan

t-an

eous

Max

. Br

anch

Si

ze5

(A)

1P15

70

A

2P15

100

A

2P11

015

0A

3P15

100

A

3P11

015

0A

225

Alu

min

umEE

225T

3H6.

5

LG_U

3.

340

035

035

04

12

LD_W

3.3

600

6007

600

8

11

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HLD

_W 3

.3S

600

6007

600

10

11

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HLD

_W

5.3/

6.3

600

6007

600

810

011

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

H

D-M

C*

600/

600

6007

(1)(

1)4

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

H

LG_U

3.

3S40

035

035

0

10

12

LD_W

3.3

600

6007

600

8

11

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HLD

_W 3

.3S

600

6007

600

10

11

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HLD

_W

5.3/

6.3

600

6007

600

810

011

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

H

D-M

C*

600/

600

6007

(1)(

1)4

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

H

LG_U

5.

3/6.

340

035

035

04

100

12

LD_W

3.3

600

6007

600

8

11

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HLD

_W 3

.3S

600

6007

600

10

11

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HLD

_W

5.3/

6.3

600

6007

600

810

011

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

H

D-M

C*

600/

600

6007

(1)(

1)4

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

H

LA/L

H

MC

400

400

LD_W

3.3

600

6007

600

8

11

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HLD

_W 3

.3S

600

6007

600

10

11

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HLD

_W

5.3/

6.3

600

6007

600

810

011

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

H

D-M

C*

600/

600

6007

(1)(

1)4

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

H

Cop

per

EE22

5T3H

CU

3.8

LG_U

3.

340

035

035

04

12

LD_W

3.3

600

6007

600

8

11

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HLD

_W 3

.3S

600

6007

600

10

11

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HLD

_W

5.3/

6.3

600

6007

600

810

011

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

H

D-M

C*

600/

600

6007

(1)(

1)4

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

H

LG_U

3.

3S40

040

040

0

10

12

LD_W

3.3

600

6007

600

8

11

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HLD

_W 3

.3S

600

6007

600

10

11

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HLD

_W

5.3/

6.3

600

6007

600

810

011

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

H

D-M

C*

600/

600

6007

(1)(

1)4

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

H

LG_U

5.

3/6.

340

035

035

04

100.

212

LD_W

3.3

600

6007

600

8

11

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HLD

_W 3

.3S

600

6007

600

10

11

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HLD

_W

5.3/

6.3

600

6007

600

810

011

150

QO

(B)-V

HQ

O(B

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QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

H

D-M

C*

600/

600

6007

(1)(

1)4

150

QO

(B)-V

HQ

O(B

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QO

(B)-V

HQ

O(B

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QO

(B)-V

H

LA/L

H

MC

400

225

LD_W

3.3

600

6007

600

8

11

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HLD

_W 3

.3S

600

6007

600

10

11

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HLD

_W

5.3/

6.3

600

6007

600

810

011

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

H

D-M

C*

600/

600

6007

(1)(

1)4

150

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

HQ

O(B

)-VH

QO

(B)-V

H*

NO

TE: D

-MC

and

L-M

C c

ircui

t bre

aker

s ar

e ob

sole

te.

1 V

alue

s re

pres

enta

tive

of im

peda

nce

valu

es fo

r Squ

are

D tr

ansf

orm

ers.

2 A

llow

prim

ary

trip

ratin

g to

incr

ease

to 2

50%

of r

ated

FLC

(NE

C 4

50.4

); se

cond

ary

mai

n tri

p ra

ting

cann

ot e

xcee

d 12

5% o

f rat

ed F

LC.

3 S

elec

tive

with

2 p

ole

QO

(B) t

hrou

gh 8

0 A

ratin

g.4

Sel

ectiv

e w

ith 3

pol

e Q

O(B

) thr

ough

60

A ra

ting.

5 B

ranc

h ci

rcui

t bre

aker

s w

ith a

mpe

re ra

tings

of 5

0%, o

r les

s, o

f the

D-M

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ain

circ

uit b

reak

er a

re s

elec

tive.

Val

ues

show

n in

this

col

umn

corr

espo

nd to

the

min

imum

D-M

C tr

ip in

col

umn

to th

e le

ft.6

Sec

onda

ry m

ain

circ

uit b

reak

ers

will

not c

arry

rate

d se

cond

ary

curr

ent o

f 416

A.

7 S

econ

dary

mai

n ci

rcui

t bre

aker

s w

ill no

t car

ry ra

ted

seco

ndar

y cu

rren

t of 3

25 A

.8

Prim

ary

circ

uit b

reak

er s

elec

tions

sho

wn

are

for 3

5 kA

SC

CR

s; if

the

syst

em h

as

Date post:	08-Nov-2015
Category:	Documents
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Square D Coordinating Breakers

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