MasterPact™ NT and NW Universal Power Circuit Breakers Class 0613 – Catalog
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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