Selection

Selection Introduction

MasterPacT circuit breakers are available in three frame sizes:

T-frame circuit breakers: rated up to 800 A (ANSI Certified), up to 1600 A (UL^® Listed), and up to 1600 A (IEC Rated).
W-frame circuit breakers: rated up to 4000 A (ANSI Certified), up to 3000 A (UL Listed), and up to 4000 A (IEC Rated).
Y-frame circuit breakers: rated up to 5000 A (ANSI Certified), up to 6000 A (UL Listed), and up to 6300 A (IEC Rated).

Within each range, several sensor plugs are available to determine the maximum trip rating of each circuit breaker. In addition to a sensor plug, an adjustable rating plug is available to get lower ampacity than that available with the sensor plug.

MasterPacT circuit breakers can be equipped with a variety of MicroLogic electronic trip unit configurations, ranging from basic circuit protection to more advanced relay protection and power metering capabilities. Additionally all electronic trip units within the new MicroLogic family are field interchangeable and upgradeable. Each control unit is also equipped with an interchangeable and upgradeable adjustable rating plug which is used to select the long-time pickup setting of the circuit breaker.

MasterPacT circuit breakers are ordered by sensor plug rating, not ampere trip rating. The trip rating of the circuit breaker is determined by the setting of the adjustable rating plug. Sensor plugs and rating plugs are field replaceable.

Overview of Selection Procedure

Select the completely assembled circuit breaker (circuit breaker frame plus trip unit):
1. The frame ampere rating required
2. The interrupting rating required
3. The sensor plug rating required
4. The connections
Select the trip unit, rating plug, and trip unit options.
Select circuit breaker frame options, if required.
Select cradle options, if required.

Circuit Breaker Selection Options

Model Number

Frame type

Y (wide-construction)

Maximum frame rating

ANSI

IEC

ANSI

IEC

ANSI

IEC

800 A

1200 A

1600 A

3200 A

4000 A

3000 A

4000 A

6000 A

6300 A

Maximum Interrupting Rating (kA, 50/60 Hz)

AC rating

254 V
42 kA

240 V
200 kA

240 V
150 kA

254 V
200 kA

254 V
100 kA

240 V
200 kA

240 V
150 kA

254 V
200 kA

240 V
200 kA

240 V
150 kA

508 V
42 kA

480 V
100 kA

440 V
130 kA

508 V
200 kA

508 V\
100 kA

480 V
150 kA

440 V
150 kA

508 V
200 kA

480 V
150 kA

440 V
150 kA

635 V
N/A

600 V
50 kA

690 V
42 kA

635 V
130 kA

635 V
85 kA

600 V
100 kA

690 V
100 kA

690 V
130 kA

600 V
100 kA

690 V
100 kA

Construction

Drawout

—

Fixed (UL Listed and IEC Rated only)

Termination

Rotatable rear terminals

Front-connected terminals

Accessories Available for the Circuit Breaker and Cradle

• Shunt close

• Ready-to-close contact

• Door interlock

• Shunt trip

• Overcurrent trip switch (standard)

• Operations counter

• Undervoltage trip

• Rack in interlock

• Safety Shutter

• Fixed time delay

• Key locks for circuit breaker and cradle

• Cradle rejection kit (standard)

• Adjustable time delay

· Padlock attachment (circuit breaker + cradle)

• Rail Padlocking

• Spring-charging motor

• Mechanical interlocks

• Auxiliary contacts (standard)

• Cradle position switches

Electronic Trip Unit Features

• True RMS sensing

• Trip indication LED

• Neutral protection

• LSI

• Zone-selective interlocking (ZSI)

• Contact wear indication

• Ground-fault alarm (no trip)

• Communications

• Incremental fine-tuning of settings

• Ground-fault trip

• LCD dot matrix display

• Selectable long-time delay bands

• Ground-fault trip and programmable alarm

• Advanced user interface

• Power measurement

• Adjustable rating plugs

• Protective relay functions

• Expanded memory

• Long-time pickup LED

• Thermal imaging

• Enhanced power quality measurement

MicroLogic Trip Unit Selection

Design Platform Designation	Feature Type	Protection	Model Number
Basic Trip Unit	Basic	LS0 (IEC Rated)	2
		LI (UL Listed/ANSI Certified)	3
		LSI	5
Trip Unit with Ammeter	A	LS0 (IEC Rated)	2.0A
		LI (UL Listed/ANSI Certified)	3.0A
		LSI	5.0A
		LSIG	6.0A
Trip Unit with Power Metering	P	LSI	5.0P
Trip Unit with Power Metering	P	LSIG	6.0P
Trip Unit with Harmonic Metering	H	LSI	5.0H
Trip Unit with Harmonic Metering	H	LSIG	6.0H

Factory-Assembled Circuit Breakers and Switches

T-Frame Circuit Breaker Selection

ANSI C37 Certified/UL 1066 Listed T-Frame Circuit Breakers

Frame Rating	Model Number	Interrupting Rating			Sensor Plug Rating
Frame Rating	Model Number	254 V	508 V	635 V	Sensor Plug Rating
800 A	NT08N1	42 kA	42 kA	—	100 A, 250 A, 400 A, 600 A, 800 A

UL 489 Listed T-Frame Circuit Breakers

Frame Rating	Model Number	Interrupting Rating			Sensor Plug Rating
Frame Rating	Model Number	240 V	480 V	600 V	Sensor Plug Rating
800 A	NT08N	50 kA	50 kA	35 kA	100 A, 250 A, 400 A, 600 A, 800 A
	NT08H	65 kA	50 kA	50 kA	100 A, 250 A, 400 A, 600 A, 800 A
	NT08L*	100 kA	65 kA	—	100 A, 250 A, 400 A, 600 A, 800 A
	NT08L*	200 kA	100 kA	—	100 A, 250 A, 400 A, 600 A, 800 A
	NT08LF*	200 kA	100 kA	—	100 A, 250 A, 400 A, 600 A, 800 A
1200 A	NT12N	50 kA	50 kA	35 kA	600 A, 800 A, 1000 A, 1200 A
	NT12H	65 kA	50 kA	50 kA	600 A, 800 A, 1000 A, 1200 A
	NT12L1*	100 kA	65 kA	—	600 A, 800 A, 1000 A, 1200 A
	NT12L*	200 kA	100 kA	—	600 A, 800 A, 1000 A, 1200 A
	NT12LF*	200 kA	5100 kA	—	600 A, 800 A, 1000 A, 1200 A
1600 A*	NT16N	50 kA	50 kA	35 kA	800 A, 1000 A, 1200 A, 1600 A
	NT16H	65 kA	50 kA	50 kA	800 A, 1000 A, 1200 A, 1600 A
	NT16L*	100 kA	65 kA	—	800 A, 1000 A, 1200 A, 1600 A
	NT16L*	200 kA	100 kA	—	800 A, 1000 A, 1200 A, 1600 A
	NT16LF*	200 kA	5100 kA	—	800 A, 1000 A, 1200 A, 1600 A

IEC 60947-2 Rated T-Frame Circuit Breakers

Frame Rating	Model Number	Interrupting Rating (kA)				Sensor Plug Rating (A)
Frame Rating	Model Number	240 V	440 V	690 V	1000 V	Sensor Plug Rating (A)
800 A	NT08H1	42 kA	42 kA	42 kA	—	250 A, 400 A, 630 A, 800 A
800 A	NT08L1	150 kA	130 kA	25 kA	—	250 A, 400 A, 630 A, 800 A
1000 A	NT10H1	42 kA	42 kA	42 kA	—	400 A, 630 A, 800 A, 1000 A
1000 A	NT10L1	150 kA	130 kA	25 kA	—	400 A, 630 A, 800 A, 1000 A
1250 A	NT12H1	42 kA	42 kA	42 kA	—	630 A, 800 A, 1000 A, 1250 A
1600 A	NT16H1	42 kA	42 kA	42 kA	—	800 A, 1000 A, 1250 A, 1600 A

NOTE: L1F and LF circuit breakers are tested to show the arc flash hazard risk category as referenced by NFPA 70E.

T-Frame Switch Selection

ANSI C37 Certified/UL 1066 Listed, Non-Automatic T-Frame Switch

Frame Rating	Model Number	Interrupting Rating*			Short-Time (0.5 s) Rating
Frame Rating	Model Number	254 V	508 V	635 V	Short-Time (0.5 s) Rating
800 A	NT08NA	42 kA	42 kA	NA	42 kA
800 A	NT08HA	42 kA	42 kA	22 kA	42 kA

UL 489 Listed, Automatic T-Frame Switches

Frame Rating	Model Number	Withstand Rating*			Instantaneous Override
Frame Rating	Model Number	240 V	480 V	600 V	Instantaneous Override
800 A	NT08HF	65 kA	50 kA	50 kA	40 kA
800 A	NT08HB	200 kA	100 kA	N/A	10 kA
1200 A	NT12HF	65 kA	50 kA	50 kA	40 kA
1200 A	NT12HB*	200 kA	100 kA	N/A	10 kA
1600 A*	NT16HF	65 kA	50 kA	50 kA	40 kA
1600 A*	NT16HB*	200 kA	100 kA	N/A	10 kA

IEC 60947-3 Rated, Non-Automatic T-Frame Switches

Frame Rating	Model Number	Interrupting Rating*				Short-Time (0.5 s) Rating
Frame Rating	Model Number	240 V	440 V	690 V	1000 V	Short-Time (0.5 s) Rating
800 A	NT08HA	42 kA	42 kA	42 kA	—	42 kA
1000 A	NT10HA	42 kA	42 kA	42 kA	—	42 kA
1250 A	NT12HA	42 kA	42 kA	42 kA	—	42 kA
1600 A	NT16HA	42 kA	42 kA	42 kA	—	42 kA

W-Frame Circuit Breaker Selection

ANSI C37/UL 1066 Listed W-Frame Circuit Breakers

Frame Rating	Model Number	Interrupting Rating			Sensor Plug Rating
Frame Rating	Model Number	254 V	508 V	635 V	Sensor Plug Rating
800 A	NW08N1	42 kA	42 kA	42 kA	100 A, 250 A, 400 A, 600 A, 800 A
	NW08H1	65 kA	65 kA	65 kA
	NW08H2	85 kA	85 kA	85 kA
	NW08H3	100 kA	100 kA	85 kA
	NW08L*	200 kA	200 kA	130 kA
	NW08L1F*	200 kA	200 kA	130 kA
1600 A	NW16N1	42 kA	42 kA	42 kA	800 A, 1000 A, 1200 A, 1600 A
	NW16H1	65 kA	65 kA	65 kA
	NW16H2	85 kA	85 kA	85 kA
	NW16H3	100 kA	100 kA	85 kA
	NW16L1*	200 kA	200 kA	130 kA
	NW16L1F*	200 kA	200 kA	130 kA
2000 A	NW20H1	65 kA	65 kA	65 kA	1000 A, 1200 A, 1600 A, 2000 A
	NW20H2	85 kA	85 kA	85 kA
	NW20H3	100 kA	100 kA	85 kA
	NW20L1*	100 kA	200 kA	130 kA
	NW20L1F*	200 kA	200 kA	130 kA
3200 A	NW32H1	65 kA	65 kA	65 kA	1600 A, 2000 A, 2500 A, 3000 A, 3200 A
	NW32H2	85 kA	85 kA	85 kA
	NW32H3	100 kA	100 kA	85 kA
4000 A (W-Frame)	NW40BH1	65 kA	65 kA	65 kA	2000 A, 2500 A, 3000 A, 3200 A, 3600 A, 4000 A
	NW40BH2	85 kA	85 kA	85 kA
	NW40BH3	100 kA	100 kA	85 kA

NOTE: L1F circuit breakers are tested to show the arc flash hazard risk category as referenced by NFPA 70E.

UL 489 Listed W-Frame Circuit Breakers

Frame Rating	Model Number	Interrupting Rating			Sensor Plug Rating
Frame Rating	Model Number	240 V	480 V	600 V	Sensor Plug Rating
800 A	NW08N	65 kA	65 kA	50 kA	100 A, 250 A, 400 A, 600 A, 800 A
	NW08H	100 kA	100 kA	85 kA
	NW08L*	200 kA	150 kA	100 kA
	NW08LF*	200 kA	150 kA	100 kA
1200 A	NW12N	65 kA	65 kA	50 kA	600 A, 800 A, 1000 A, 1200 A
	NW12H	100 kA	100 kA	85 kA
	NW12L*	200 kA	150 kA	100 kA
	NW12LF*	200 kA	150 kA	100 kA
1600 A	NW16N	65 kA	65 kA	50 kA	800 A, 1000 A, 1200 A, 1600 A
	NW16H	100 kA	100 kA	85 kA
	NW16L*	200 kA	150 kA	100 kA
	NW16LF*	200 kA	150 kA	100 kA
2000 A	NW20N	65 kA	65 kA	50 kA	1000 A, 1200 A, 1600 A, 2000 A
	NW20H	100 kA	100 kA	85 kA
	NW20L*	200 kA	150 kA	100 kA
	NW20LF*	200 kA	150 kA	100 kA
2500 A	NW25H	100 kA	100 kA	85 kA	1200 A, 1600 A, 2000 A, 2500 A
2500 A	NW25L*	200 kA	150 kA	100 kA
3000 A	NW30H	100 kA	100 kA	85 kA
3000 A	NW30L*	200 kA	150 kA	100 kA

NOTE:

LF circuit breakers are tested to show the arc flash hazard risk category as referenced by

NFPA 70E.

IEC 60947-2 Rated W-Frame Circuit Breakers

Frame Rating	Model Number	Interrupting Rating				Sensor Plug Rating
Frame Rating	Model Number	240 V	440 V	690 V	1150 V	Sensor Plug Rating
800 A	NW08N1	42 kA	42 kA	42 kA	—	400 A, 630 A, 800 A
	NW08H1	65 kA	65 kA	65 kA	—
	NW08H2	100 kA	100 kA	85 kA	—
	NW08L*	150 kA	150 kA	100 kA	—
	NW08H10*	—	—	—	50 kA
1000 A	NW10N1	42 kA	42 kA	42 kA	—	400 A, 630 A, 800 A, 1000 A
	NW10H1	65 kA	65 kA	65 kA	—
	NW10H2	100 kA	100 kA	85 kA	—
	NW10L1*	150 kA	150 kA	100 kA	—
	NW10H1*	—	—	—	50 kA
1250 A	NW12N1	42 kA	42 kA	42 kA	—	630 A, 800 A, 1000 A 1250 A
	NW12H1	65 kA	65 kA	65 kA	—
	NW12H2	100 kA	100 kA	85 kA	—
	NW12L1*	150 kA	150 kA	100 kA	—
	NW12H10*	—	—	—	50 kA
1600 A	NW16N1	42 kA	42 kA	42 kA	—	800 A, 1000 A, 1250 A, 1600 A
	NW16H1	65 kA	65 kA	65 kA	—
	NW16H2	100 kA	100 kA	85 kA	—
	NW16L1*	150 kA	150 kA	100 kA	—
	NW16H10*	—	—	—	50 kA
2000 A	NW20H1	65 kA	65 kA	65 kA	—	1000 A, 1250 A, 1600 A, 2000 A
	NW20H2	100 kA	100 kA	85 kA	—
	NW20H3*	150 kA	150 kA	100 kA	—
	NW20L1*	150 kA	150 kA	100 kA	—
	NW20H10*	—	—	—	50 kA
2500 A	NW25H1	65 kA	65 kA	65	—	1250 A, 1600 A, 2000 A, 2500 A
	NW25H2	100 kA	100 kA	85	—
	NW25H3*	150 kA	150 kA	100	—
	NW25H10*	—	—	—	50 kA
3200 A	NW32H1	65 kA	65 kA	65 kA	—	1600 A, 2000 A, 2500 A, 3200 A
	NW32H2	100 kA	100 kA	85 kA	—
	NW32H3*	150 kA	150 kA	100 kA	—
	NW32H10*	—	—	—	50 kA
4000 A	NW40H1	65 kA	65 kA	65 kA	—	2000 A, 2500 A, 3200 A, 4000 A
	NW40H2	100 kA	100 kA	85 kA	—
	NW40H3*	150 kA	150 kA	100 kA	—
	NW40H10*	—	—	—	50 kA

W-Frame Switch Selection

ANSI C37 Certified/UL 1066 Listed, Non-Automatic Switch

Frame Rating	Model Number	Interrupting Rating*			Short-Time (0.5 s) Rating
Frame Rating	Model Number	254 V	508 V	635 V	Short-Time (0.5 s) Rating
800 A	NW08HA	65 kA	65 kA	65 kA	65 kA
1600 A	NW16HA	65 kA	65 kA	65 kA	65 kA
2000 A	NW20HA	65 kA	65 kA	65 kA	65 kA
3200 A	NW32HA	65 kA	65 kA	65 kA	65 kA

Frame Rating (W-Frame)	Model Number	Interrupting Rating*			Short-Time (0.5 s) Rating
Frame Rating (W-Frame)	Model Number	254 V	508 V	635 V	Short-Time (0.5 s) Rating
800 A	NW08HF	100 kA	100 kA	85 kA	85 kA
800 A	NW08HCNot available in 4P.*	200 kA	200 kA	130 kA	30 kA
1600 A	NW16HF	100 kA	100 kA	85 kA	85 kA
1600 A	NW16HCNot available in 4P.*	200 kA	200 kA	130 kA	30 kA
2000 A	NW20HF	100 kA	100 kA	85 kA	85 kA
2000 A	NW20HCNot available in 4P.*	200 kA	200 kA	130 kA	30 kA
3200 A	NW32HF	100 kA	100 kA	85 kA	85 kA

Frame Rating	Model Number	Interrupting Rating*			Short-Time (0.5 s) Rating
Frame Rating		254 V	508 V	635 V	Short-Time (0.5 s) Rating
800 A	NW08HF	100 kA	100 kA	85 kA	85 kA
1600 A	NW16HF	100 kA	100 kA	85 kA	85 kA
2000 A	NW20HF	100 kA	100 kA	85 kA	85 kA
3200 A	NW32HF	100 kA	100 kA	85 kA	85 kA

UL 489 Listed, Fixed Automatic Switch

Frame Rating	Model Number	Withstand Rating*			Instantaneous Override
Frame Rating	Model Number	240 V	480 V	600 V	Instantaneous Override
800 A	NW08HF	100 kA	100 kA	85 kA	40 kA
1200 A	NW12HF	100 kA	100 kA	85 kA	40 kA
1600 A	NW16HF	100 kA	100 kA	85 kA	40 kA
2000 A	NW20HF	100 kA	100 kA	85 kA	40 kA
2500 A	NW25HF	100 kA	100 kA	85 kA	65 kA
3000 A	NW30HF	100 kA	100 kA	85 kA	65 kA

UL 489 Listed, Drawout Automatic Switch

Frame Rating	Model Number	Withstand Rating*			Instantaneous Override
Frame Rating	Model Number	240 V	480 V	600 V	Instantaneous Override
800 A	NW08HF	100 kA	100 kA	85 kA	40 kA
800 A	NW08HB*	200 kA	150 kA	100 kA	35 kA
1200 A	NW12HF	100 kA	100 kA	85 kA	40 kA
1200 A	NW12HB*	200 kA	150 kA	100 kA	35 kA
1600 A	NW16HF	100 kA	100 kA	85 kA	40 kA
1600 A	NW16HB*	200 kA	150 kA	100 kA	35 kA
2000 A	NW20HF	100 kA	100 kA	85 kA	40 kA
2000 A	NW20HB*	200 kA	150 kA	100 kA	35 kA
2500 A	NW25HF	100 kA	100 kA	85 kA	65 kA
2500 A	NW25HB*	200 kA	150 kA	100 kA	65 kA
3000 A	NW30HF	100 kA	100 kA	85 kA	65 kA
3000 A	NW30HB*	200 kA	150 kA	100 kA	65 kA

IEC 60947-3 Rated, Automatic Switch

Frame Rating	Model Number	Withstand Rating*			Instantaneous Override
Frame Rating	Model Number	240 V	440 V	690 V	Instantaneous Override
800 A	NW08HF	85 kA	85 kA	85 kA	85 kA
1000 A	NW10HF	85 kA	85 kA	85 kA	85 kA
1250 A	NW12HF	85 kA	85 kA	85 kA	85 kA
1600 A	NW16HF	85 kA	85 kA	85 kA	85 kA
2000 A	NW20HF	85 kA	85 kA	85 kA	85 kA
2500 A	NW25HF	85 kA	85 kA	85 kA	85 kA
3200 A	NW32HF	85 kA	85 kA	85 kA	85 kA
4000 A	NW40HF	85 kA	85 kA	85 kA	85 kA

Frame Rating	Model Number	Interrupting Rating*				Short-Time (0.5 s) Rating
Frame Rating	Model Number	240 V	440 V	690 V	1150 V	Short-Time (0.5 s) Rating
800 A	NW08NA	42 kA	42 kA	42 kA	—	42 kA
	NW08HA	50 kA	50 kA	50 kA	—	50 kA
	NW08HA10*	—	—	—	50 kA	50 kA
1000 A	NW10NA	42 kA	42 kA	42 kA	—	42 kA
	NW10HA	50 kA	50 kA	50 kA	—	50 kA
	NW10HA10*	—	—	—	50 kA	50 kA
1250 A	NW12NA	42 kA	42 kA	42 kA	—	42 kA
	NW12HA	50 kA	50 kA	50 kA	—	50 kA
	NW12HA10*	—	—	—	50 kA	50 kA
1600 A	NW16NA	42 kA	42 kA	42 kA	—	42 kA
	NW16HA	50 kA	50 kA	50 kA	—	50 kA
	NW16HA10*	—	—	—	50 kA	50 kA
2000 A	NW20HA	50 kA	50 kA	50 kA	—	50 kA
2000 A	NW20HA10*	—	—	—	50 kA	50 kA
2500 A	NW25HA	50 kA	50 kA	50 kA	—	50 kA
2500 A	NW25HA10*	—	—	—	50 kA	50 kA
3200 A	NW32HA	50 kA	50 kA	50 kA	—	50 kA
3200 A	NW32HA10*	—	—	—	50 kA	50 kA
4000 A	NW40HA	50 kA	50 kA	50 kA	—	50 kA
4000 A	NW40HA10*	—	—	—	50 kA	50 kA

Y-Frame Circuit Breaker Selection

ANSI C37 Certified/UL 1066 Listed Y-Frame Circuit Breakers

Frame Rating	Model Number	Interrupting Rating (kA)			Sensor Plug Rating (A)
Frame Rating	Model Number	254 V	508 V	635 V	Sensor Plug Rating (A)
3200 A to 4000 A	NW32L1*	200 kA	200 kA	130 kA	2000 A, 2500 A, 3000 A, 3200 A
	NW40H2	85 kA	85 kA	85 kA	2000 A, 2500 A, 3000 A, 3200 A, 4000 A
	NW40H3	100 kA	100 kA	85 kA	2000 A, 2500 A, 3000 A, 3200 A, 4000 A
	NW40L1*	200 kA	200 kA	130 kA	2000 A, 2500 A, 3000 A, 3200 A, 4000 A
5000 A	NW50H2	85 kA	85 kA	85 kA	2500 A, 3000 A, 3200 A, 4000 A, 5000 A
	NW50H3	100 kA	100 kA	85 kA	2500 A, 3000 A, 3200 A, 4000 A, 5000 A
	NW50L1*	200 kA	200 kA	130 kA	2500 A, 3000 A, 3200 A, 4000 A, 5000 A

UL 489 Listed Y-Frame Circuit Breakers

Frame Rating	Model Number	Interrupting Rating			Sensor Plug Rating
Frame Rating	Model Number	240 V	480 V	600 V	Sensor Plug Rating
4000 A	NW40H	100 kA	100 kA	85 kA	2000 A, 2500 A, 3000 A, 4000 A
4000 A	NW40L*	200 kA	150 kA	100 kA	2000 A, 2500 A, 3000 A, 4000 A
5000 A	NW50H	100 kA	100 kA	85 kA	2500 A, 3000 A, 4000 A, 5000 A
5000 A	NW50L*	200 kA	150 kA	100 kA	2500 A, 3000 A, 4000 A, 5000 A
6000 A	NW60H	100 kA	100 kA	85 kA	3000 A, 4000 A, 5000 A, 6000 A
6000 A	NW60L*	200 kA	150 kA	100 kA	3000 A, 4000 A, 5000 A, 6000 A

IEC 60947-2 Rated Y-Frame Circuit Breakers

Frame Rating	Model Number	Interrupting Rating			Sensor Plug Rating
Frame Rating	Model Number	240 V	440 V	690 V	Sensor Plug Rating
4000 A	NW40BH1	100 kA	100 kA	100 kA	2000 A, 2500 A, 3200 A, 4000 A
4000 A	NW40BH2	150 kA	150 kA	100 kA	2000 A, 2500 A, 3200 A, 4000 A
5000 A	NW50H1	100 kA	100 kA	100 kA	2500 A, 3200 A, 4000 A, 5000 A
5000 A	NW50H2	150 kA	150 kA	100 kA	2500 A, 3200 A, 4000 A, 5000 A
6300 A	NW63H1	100 kA	100 kA	100 kA	3200 A, 4000 A, 5000 A, 6300 A
6300 A	NW63H2	150 kA	150 kA	100 kA	3200 A, 4000 A, 5000 A, 6300 A

Y-Frame Switch Selection

Frame Rating	Model Number	Interrupting Rating (kA)*			Short-Time (0.5 s) Rating
Frame Rating	Model Number	254 V	508 V	635 V	Short-Time (0.5 s) Rating
4000 A	NW40HA	85 kA	85 kA	85 kA	85 kA
5000 A	NW50HA	85 kA	85 kA	85 kA	85 kA

ANSI C37 Certified/UL 1066 Listed, Drawout Automatic Switches

Frame Rating (Y-Frame)	Model Number	Interrupting Rating*			Short-Time (0.5 s) Rating
Frame Rating (Y-Frame)	Model Number	254 V	508 V	635 V	Short-Time (0.5 s) Rating
3200 A	NW32HCNot available in 4P.*	200 kA	200 kA	130 kA	100 kA
4000 A	NW40HF	100 kA	100 kA	85 kA	85 kA
4000 A	NW40HCNot available in 4P.*	200 kA	200 kA	130 kA	100 kA
5000 A	NW50HF	100 kA	100 kA	85 kA	85 kA
5000 A	NW50HCNot available in 4P.*	200 kA	200 kA	130 kA	100 kA

ANSI C37 Certified/UL 1066 Listed, Fixed Automatic Switches

Frame Rating (Y-Frame)	Model Number	Interrupting Rating*			Short-Time (0.5 s) Rating
Frame Rating (Y-Frame)	Model Number	254 V	508 V	635 V	Short-Time (0.5 s) Rating
4000 A	NW40HF	100 kA	100 kA	85 kA	85 kA
5000 A	NW50HF	100 kA	100 kA	85 kA	85 kA

UL 489 Listed, Fixed Automatic Switches

Frame Rating	Model Number	Withstand Rating*			Instantaneous Override
Frame Rating	Model Number	240 V	480 V	600 V	Instantaneous Override
4000 A	NW40HF	100 kA	100 kA	85 kA	75 kA
5000 A	NW50HF	100 kA	100 kA	85 kA	75 kA
6000 A	NW60HF	100 kA	100 kA	85 kA	75 kA

IEC 60947-3 Rated, Non-Automatic Switches

Frame Rating	Model Number	Interrupting Rating*			Short-Time (0.5 s) Rating
Frame Rating	Model Number	240 V	440 V	690 V	Short-Time (0.5 s) Rating
4000 A	NW40BHA	85 kA	85 kA	85 kA	85 kA
5000 A	NW50HA	85 kA	85 kA	85 kA	85 kA
6300 A	NW63HA	85 kA	85 kA	85 kA	85 kA