0613CT0001

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.

NOTE: 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

  1. Select the completely assembled circuit breaker (circuit breaker frame plus trip unit):

    — The frame ampere rating required

    — The interrupting rating required

    — The sensor plug rating required

    — The connections

  2. Select the trip unit, rating plug, and trip unit options.
  3. Select circuit breaker frame options, if required.
  4. Select cradle options, if required.

Circuit Breaker Selection Options

Model Number NT NW NW
Frame type T W Y (wide-construction)
Maximum frame rating ANSI UL UL IEC ANSI ANSI UL IEC ANSI UL IEC
800 A 1200 A 1600 A 1600 A 3200 A 4000 A 3000 A 4000 A 6000 A 6000 A 6300 A
Maximum Interrupting Rating (kA, 50/60 Hz)
AC rating 254 V
42 kA
240 V
200 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
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
600 V
50 kA
690 V
42 kA
635 V
130 kA
635 V
85 kA
600 V
100 kA
690 V
100 kA
635 V
130 kA
600 V
100 kA
690 V
100 kA
Construction
Drawout X X X X X X X X X
Fixed (UL Listed and IEC Rated only) X X X X X X X X X X X
Termination
Rotatable rear terminals X X X X X X X X X X X
Front-connected terminals X X X X X X X X X X X
Accessories Available for the Circuit Breaker and Cradle
• Shunt close
• Shunt trip
• Undervoltage trip
• Fixed time delay
• Adjustable time delay
• Spring-charging motor
• Auxiliary contacts (standard)
• Ready-to-close contact
• Overcurrent trip switch (standard)
• Rack in interlock
• Key locks for circuit breaker and cradle
• Padlock attachment (circuit breaker plus cradle)
• Mechanical interlocks
• Cradle position switches
• Door interlock
• Operations counter
• Safety Shutter
• Cradle rejection kit (standard)
• Rail Padlocking
Electronic Trip Unit Features
• True RMS sensing
• LSI
• Ground-fault alarm (no trip)
• Ground-fault trip
• Ground-fault trip and programmable alarm
• Adjustable rating plugs
• Long-time pickup LED
• Trip indication LED
• Zone-selective interlocking (ZSI)
• Communications
• LCD dot matrix display
• Advanced user interface
• Protective relay functions
• Thermal imaging
• Neutral protection
• Contact wear indication
• Incremental fine-tuning of settings
• Selectable long-time delay bands
• Power measurement
• Expanded memory
• 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
LSIG 6.0P
Trip Unit with Harmonic Metering H LSI 5.0H
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
254 V 508 V 635 V
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
240 V 480 V 600 V
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

NT08L1*

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

NT16L1*

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)
240 V 440 V 690 V 1000 V
800 A

NT08H1

42 kA 42 kA 42 kA 250 A, 400 A, 630 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

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
254 V 508 V 635 V
800 A

NT08NA

42 kA 42 kA NA 42 kA

NT08HA

42 kA 42 kA 22 kA 42 kA

UL 489 Listed, Automatic T-Frame Switches

Frame Rating Model Number Withstand Rating* Instantaneous Override
240 V 480 V 600 V
800 A

NT08HF

65 kA 50 kA 50 kA 40 kA

NT08HB*

200 kA 100 kA N/A 10 kA
1200 A

NT12HF

65 kA 50 kA 50 kA 40 kA

NT12HB*

200 kA 100 kA N/A 10 kA
1600 A*

NT16HF

65 kA 50 kA 50 kA 40 kA

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
240 V 440 V 690 V 1000 V
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
254 V 508 V 635 V
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 100 A, 250 A, 400 A, 600 A, 800 A

NW08H2

85 kA 85 kA 85 kA 100 A, 250 A, 400 A, 600 A, 800 A

NW08H3

100 kA 100 kA 85 kA 100 A, 250 A, 400 A, 600 A, 800 A

NW08L1*

200 kA 200 kA 130 kA 100 A, 250 A, 400 A, 600 A, 800 A

NW08L1F*

200 kA 200 kA 130 kA 100 A, 250 A, 400 A, 600 A, 800 A
1600 A

NW16N1

42 kA 42 kA 42 kA 800 A, 1000 A, 1200 A, 1600 A

NW16H1

65 kA 65 kA 65 kA 800 A, 1000 A, 1200 A, 1600 A

NW16H2

85 kA 85 kA 85 kA 800 A, 1000 A, 1200 A, 1600 A

NW16H3

100 kA 100 kA 85 kA 800 A, 1000 A, 1200 A, 1600 A

NW16L1*

200 kA 200 kA 130 kA 800 A, 1000 A, 1200 A, 1600 A

NW16L1F*

200 kA 200 kA 130 kA 800 A, 1000 A, 1200 A, 1600 A
2000 A

NW20H1

65 kA 65 kA 65 kA 1000 A, 1200 A, 1600 A, 2000 A

NW20H2

85 kA 85 kA 85 kA 1000 A, 1200 A, 1600 A, 2000 A

NW20H3

100 kA 100 kA 85 kA 1000 A, 1200 A, 1600 A, 2000 A

NW20L1*

100 kA 200 kA 130 kA 1000 A, 1200 A, 1600 A, 2000 A

NW20L1F*

200 kA 200 kA 130 kA 1000 A, 1200 A, 1600 A, 2000 A
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 1600 A, 2000 A, 2500 A, 3000 A, 3200 A

NW32H3

100 kA 100 kA 85 kA 1600 A, 2000 A, 2500 A, 3000 A, 3200 A
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 2000 A, 2500 A, 3000 A, 3200 A, 3600 A, 4000 A

NW40BH3

100 kA 100 kA 85 kA 2000 A, 2500 A, 3000 A, 3200 A, 3600 A, 4000 A
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
240 V 480 V 600 V
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 100 A, 250 A, 400 A, 600 A, 800 A

NW08L*

200 kA 150 kA 100 kA 100 A, 250 A, 400 A, 600 A, 800 A

NW08LF*

200 kA 150 kA 100 kA 100 A, 250 A, 400 A, 600 A, 800 A
1200 A

NW12N

65 kA 65 kA 50 kA 600 A, 800 A, 1000 A, 1200 A

NW12H

100 kA 100 kA 85 kA 600 A, 800 A, 1000 A, 1200 A

NW12L*

200 kA 150 kA 100 kA 600 A, 800 A, 1000 A, 1200 A

NW12LF*

200 kA 150 kA 100 kA 600 A, 800 A, 1000 A, 1200 A
1600 A

NW16N

65 kA 65 kA 50 kA 800 A, 1000 A, 1200 A, 1600 A

NW16H

100 kA 100 kA 85 kA 800 A, 1000 A, 1200 A, 1600 A

NW16L*

200 kA 150 kA 100 kA 800 A, 1000 A, 1200 A, 1600 A

NW16LF*

200 kA 150 kA 100 kA 800 A, 1000 A, 1200 A, 1600 A
2000 A

NW20N

65 kA 65 kA 50 kA 1000 A, 1200 A, 1600 A, 2000 A

NW20H

100 kA 100 kA 85 kA 1000 A, 1200 A, 1600 A, 2000 A

NW20L*

200 kA 150 kA 100 kA 1000 A, 1200 A, 1600 A, 2000 A

NW20LF*

200 kA 150 kA 100 kA 1000 A, 1200 A, 1600 A, 2000 A
2500 A

NW25H

100 kA 100 kA 85 kA 1200 A, 1600 A, 2000 A, 2500 A

NW25L*

200 kA 150 kA 100 kA 1200 A, 1600 A, 2000 A, 2500 A
3000 A

NW30H

100 kA 100 kA 85 kA 1600 A, 2000 A, 2500 A, 3000 A

NW30L*

200 kA 150 kA 100 kA 1600 A, 2000 A, 2500 A, 3000 A
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
240 V 440 V 690 V 1150 V
800 A

NW08N1

42 kA 42 kA 42 kA 400 A, 630 A, 800 A

NW08H1

65 kA 65 kA 65 kA 400 A, 630 A, 800 A

NW08H2

100 kA 100 kA 85 kA 400 A, 630 A, 800 A

NW08L1*

150 kA 150 kA 100 kA 400 A, 630 A, 800 A

NW08H10*

50 kA 400 A, 630 A, 800 A
1000 A

NW10N1

42 kA 42 kA 42 kA 400 A, 630 A, 800 A, 1000 A

NW10H1

65 kA 65 kA 65 kA 400 A, 630 A, 800 A, 1000 A

NW10H2

100 kA 100 kA 85 kA 400 A, 630 A, 800 A, 1000 A

NW10L1*

150 kA 150 kA 100 kA 400 A, 630 A, 800 A, 1000 A

NW10H10*

50 kA 400 A, 630 A, 800 A, 1000 A
1250 A

NW12N1

42 kA 42 kA 42 kA 630 A, 800 A, 1000, A1250 A

NW12H1

65 kA 65 kA 65 kA 630 A, 800 A, 1000 A, 1250 A

NW12H2

100 kA 100 kA 85 kA 630 A, 800 A, 1000 A, 1250 A

NW12L1*

150 kA 150 kA 100 kA 630 A, 800 A, 1000 A, 1250 A

NW12H10*

50 kA 630 A, 800 A, 1000 A, 1250 A
1600 A

NW16N1

42 kA 42 kA 42 kA 800 A, 1000 A, 1250 A, 1600 A

NW16H1

65 kA 65 kA 65 kA 800 A, 1000 A, 1250 A, 1600 A

NW16H2

100 kA 100 kA 85 kA 800 A, 1000 A, 1250 A, 1600 A

NW16L1*

150 kA 150 kA 100 kA 800 A, 1000 A, 1250 A, 1600 A

NW16H10*

50 kA 800 A, 1000 A, 1250 A, 1600 A
2000 A

NW20H1

65 kA 65 kA 65 kA 1000 A, 1250 A, 1600 A, 2000 A

NW20H2

100 kA 100 kA 85 kA 1000 A, 1250 A, 1600 A, 2000 A

NW20H3*

150 kA 150 kA 100 kA 1000 A, 1250 A, 1600 A, 2000 A

NW20L1*

150 kA 150 kA 100 kA 1000 A, 1250 A, 1600 A, 2000 A

NW20H10*

50 kA 1000 A, 1250 A, 1600 A, 2000 A
2500 A

NW25H1

65 kA 65 kA 65 1250 A, 1600 A, 2000 A, 2500 A

NW25H2

100 kA 100 kA 85 1250 A, 1600 A, 2000 A, 2500 A

NW25H3*

150 kA 150 kA 100 1250 A, 1600 A, 2000 A, 2500 A

NW25H10*

50 kA 1250 A, 1600 A, 2000 A, 2500 A
3200 A

NW32H1

65 kA 65 kA 65 kA 1600 A, 2000 A, 2500 A, 3200 A

NW32H2

100 kA 100 kA 85 kA 1600 A, 2000 A, 2500 A, 3200 A

NW32H3*

150 kA 150 kA 100 kA 1600 A, 2000 A, 2500 A, 3200 A

NW32H10*

50 kA 1600 A, 2000 A, 2500 A, 3200 A
4000 A

NW40H1

65 kA 65 kA 65 kA 2000 A, 2500 A, 3200 A, 4000 A

NW40H2

100 kA 100 kA 85 kA 2000 A, 2500 A, 3200 A, 4000 A

NW40H3*

150 kA 150 kA 100 kA 2000 A, 2500 A, 3200 A, 4000 A

NW40H10*

50 kA 2000 A, 2500 A, 3200 A, 4000 A

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
254 V 508 V 635 V
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

ANSI C37 Certified/UL 1066 Listed, Drawout Automatic Switch

Frame Rating
(W-Frame)
Model Number Interrupting Rating* Short-Time (0.5 s) Rating
254 V 508 V 635 V
800 A

NW08HF

100 kA 100 kA 85 kA 85 kA

NW08HC*

200 kA 200 kA 130 kA 30 kA
1600 A

NW16HF

100 kA 100 kA 85 kA 85 kA

NW16HC*

200 kA 200 kA 130 kA 30 kA
2000 A

NW20HF

100 kA 100 kA 85 kA 85 kA

NW20HC*

200 kA 200 kA 130 kA 30 kA
3200 A

NW32HF

100 kA 100 kA 85 kA 85 kA

ANSI C37 Certified/UL 1066 Listed, Fixed Automatic Switch

Frame Rating
(W-Frame)
Model Number Interrupting Rating* Short-Time (0.5 s) Rating
254 V 508 V 635 V
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
240 V 480 V 600 V
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
240 V 480 V 600 V
800 A

NW08HF

100 kA 100 kA 85 kA 40 kA

NW08HB*

200 kA 150 kA 100 kA 35 kA
1200 A

NW12HF

100 kA 100 kA 85 kA 40 kA

NW12HB*

200 kA 150 kA 100 kA 35 kA
1600 A

NW16HF

100 kA 100 kA 85 kA 40 kA

NW16HB*

200 kA 150 kA 100 kA 35 kA
2000 A

NW20HF

100 kA 100 kA 85 kA 40 kA

NW20HB*

200 kA 150 kA 100 kA 35 kA
2500 A

NW25HF

100 kA 100 kA 85 kA 65 kA

NW25HB*

200 kA 150 kA 100 kA 65 kA
3000 A

NW30HF

100 kA 100 kA 85 kA 65 kA

NW30HB*

200 kA 150 kA 100 kA 65 kA

IEC 60947-3 Rated, Automatic Switch

Frame Rating Model Number Withstand Rating* Instantaneous Override
240 V 440 V 690 V
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

IEC 60947-3 Rated, Non-Automatic Switch

Frame Rating Model Number Interrupting Rating* Short-Time (0.5 s) Rating
240 V 440 V 690 V 1150 V
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

NW20HA10*

50 kA 50 kA
2500 A

NW25HA

50 kA 50 kA 50 kA 50 kA

NW25HA10*

50 kA 50 kA
3200 A

NW32HA

50 kA 50 kA 50 kA 50 kA

NW32HA10*

50 kA 50 kA
4000 A

NW40HA

50 kA 50 kA 50 kA 50 kA

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)
254 V 508 V 635 V
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
240 V 480 V 600 V
4000 A

NW40H

100 kA 100 kA 85 kA 2000 A, 2500 A, 3000 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
 

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
 

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
240 V 440 V 690 V
4000 A

NW40BH1

100 kA 100 kA 100 kA 2000 A, 2500 A, 3200 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
 

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
 

NW63H2

150 kA 150 kA 100 kA 3200 A, 4000 A, 5000 A, 6300 A

Y-Frame Switch Selection

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

Frame Rating Model Number Interrupting Rating (kA)* Short-Time (0.5 s) Rating
254 V 508 V 635 V
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
254 V 508 V 635 V
3200 A

NW32HC*

200 kA 200 kA 130 kA 100 kA
4000 A

NW40HF

100 kA 100 kA 85 kA 85 kA

NW40HC*

200 kA 200 kA 130 kA 100 kA
5000 A

NW50HF

100 kA 100 kA 85 kA 85 kA

NW50HC*

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
254 V 508 V 635 V
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
240 V 480 V 600 V
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

UL 489 Listed, Drawout Automatic Switches

Frame Rating Model Number Withstand Rating* Instantaneous Override
240 V 480 V 600 V
4000 A

NW40HF

100 kA 100 kA 85 kA 75 kA
 

NW40HB*

1200 kA 150 kA 100 kA 75 kA
5000 A

NW50HF

100 kA 100 kA 85 kA 75 kA
 

NW50HB*

200 kA 150 kA 100 kA 75 kA
6000 A

NW60HF

100 kA 100 kA 85 kA 75 kA
 

NW60HB*

200 kA 150 kA 100 kA 75 kA

IEC 60947-3 Rated, Non-Automatic Switches

Frame Rating Model Number Interrupting Rating* Short-Time (0.5 s) Rating
240 V 440 V 690 V
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
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