Masterpact™ NT/NW Circuit Breakers

Class 613 / Refer to Catalog 0613CT0001

Full-Featured Performance

Masterpact NT Masterpact NW

The Masterpact universal power circuit breaker offers a family of circuit protection products meeting the most common world standards, ANSI, UL and IEC. The basic design platform for each is common. The final result is UL, ANSI and IEC circuit breakers with the same basic external dimensions, features and accessories.

  • Complete product offering up to 200 k AIR without fuses

  • Circuit breakers tested to show arc flash hazard risk category as referenced by NFPA70E

  • 800 A to 6000 A frames, fixed and draw-out

  • Rated for AC voltage systems through 600 V (635 V ANSI)

  • Short-time withstand ratings up to 100 kA

  • Cradle position indicator: connected, test and disconnected

  • Simple, visual contact wear indicators

  • Full complement of field-installable accessories common to all standards

  • Four interchangeable Micrologic trip units to choose from

  • Available PowerLogic™ based power metering and monitoring capabilities

  • Available protective relay functions as defined by ANSI C37.2 and C37.90

The following charts show the Masterpact NW and NT ratings for ANSI and UL 489. See Pricing Guide 0613PL0001 and Catalog 0613CT0001.

Masterpact NW Circuit Breaker Ratings

Standard
Frame Rating
Interrupting Code

ANSI C37 Certified/UL 1066 Listed

UL 489 Listed

800–1600 A

2000 A

3200/4000 A [1]

4000/5000 A

800/1200/1600/2000 A

2500/3000 A

4000/5000/6000 A

N1

H1

H2

H3

L1 [2]

L1F [2]

H1

H2

H3

L1 [2]

L1F [2]

H1

H2

H3

L1 [2]

H2

H3

L1 [2]

N

H

L [2]

LF [2]

H

L [2]

H

L [2]

Interrupting Current
(kA RMS)
50/60 Hz

240 Vac

42

65

85

100

200

200

65

85

100

200

200

65

85

100

200

85

100

200

65

100

200

200

100

200

100

200

480 Vac

42

65

85

100

200

200

65

85

100

200

200

65

85

100

200

85

100

200

65

100

150

150

100

150

100

150

600 Vac

42

65

85

85

130

130

65

85

85

130

130

65

85

85

130

85

85

130

50

85

100

100

85

100

85

100

Short-time Withstand Current (kA RMS)

42

65

85

85

30

22

65

85

85

30

22

65

85

85

100

85

85

100

42 [3]

65 [3]

30 [3][4]

22

65

65

85

100

Built-in Instantaneous Override
(kA RMS ±10%)

35 [5]

35 [5]

35 [5]

85

35 [5]

24

85

35

24

85

117

117

40

40

35 [3][4]

24

65

65

75

75

Close and latch rating (kA RMS)

42

65

40

40

25

22

65

40

40

25

22

65

40

40

40

85

75

40

40

40

25 [6]

22

40

40

40

40

Tested to show arc flash hazard risk category as referenced by NFPA70E

Yes

Yes

Yes

Breaking time

25–30 ms with no intentional delay (9 ms for L1, L1F, L and LF)

Closing time

70 ms

Sensor Rating

100–250 A

400–800 A

800–1600 A

1000–2000 A

1600–3200 A

2000–4000 A

2500–5000 A

100–250 A

400–800 A

600–1200 A

800–1600 A

1000–2000 A

1200–2500 A

1600–3000 A

2000–4000 A

2500–5000 A

3000–6000 A

Endurance Rating (C/O Cycles)
With No Maintenance

Mechanical

12,500

10,000

10,000

5k

5,000

12,500 [7]

10,000

5,000

Electrical

2800

1,000

1,000

1k

1,000

2800 [7]

1,000

1,000

Masterpact NT Circuit Breaker Ratings

Standard
Frame Rating
Interrupting Code

ANSI C37 Certified/
UL 1066 Listed

UL 489 Listed

800 A

800 A

1200 A

1600 A [8]

N1

N

H

L1

L

LF [2]

N

H

L1

L

LF [2]

N

H

L1

L

Interrupting Current
(kA RMS) 50/60 Hz

240 Vac

42

50

65

100

200

200

50

65

100

200

200

50

65

100

200

480 Vac

42

50

50

65

100

100

50

50

65

100

100

50

50

65

100

600 Vac

35

50

35

50

35

50

N/A

N/A

Short-time Withstand Current (kA RMS)

42

35

35

10

10

10

35

35

10

10

10

35

35

10

10

Built-in Instantaneous Override (kA RMS ±10%)

40

40

10

10

10

40

40

10

10

10

40

40

10

10

Close and latch rating (kA RMS)

40

25

25

10

10

10

25

25

10

10

10

25

25

10

10

Tested to show the arc flash hazard risk
category as referenced by NFPA70E

Yes

Yes

Breaking time

25–30 ms with no intentional delay

25–30 ms with no intentional delay (9 ms for L and LF)

Closing time

< 50 ms

Sensor Rating

100–250 A

100–250 A

600–1200 A

800–1600 A

400–800 A

400–800 A

Endurance Rating (C/O Cycles)
With No Maintenance

Mechanical

12,500

12,500

12,500

12,500

Electrical

2800

2800

2800

2800

NWMPRR

Masterpact NW/NT Circuit Breaker Remote Racking

Description

Cat. No.

Masterpact NW/NT Remote Racking Devices [9]

NWNTMPRRT

Masterpact NW Remote Racking Device [9]

NWMPRRT

Masterpact NT Remote Rackign Device [9]

NTMPRRT

Mounting Bracket Kit for NW Remote Racking (contains 10 mounting brackets) [10]

S47100

Mounting Bracket Kit for NT Remove Racking (contains 10 mounting brackets) [10]

S47104

Control Unit for NW Remote Racking [10]

S47101

30 ft Control Cable for NW Remote Racking [10]

S47102

Drive Shaft for NW Remote Racking [10]

S47103

Drive Shaft for NT Remote Racking [10]

S47105

Footnotes

  1. 4000 A standard width circuit breaker is not available in L1 interrupting rating code or drawout construction (fixed mounting only).
  2. Drawout mounted only.
  3. 24 kA RMS for 800 A circuit breaker frame with 100 A or 250 A sensor.
  4. 65 kA RMS for 2000 A.
  5. None except 24 kA RMS for 800 A circuit breaker frame with 100 A or 250 A sensor.
  6. 40 kA RMS for 2000 A.
  7. The endurance rating for 2000 A, N/H/L/LF is 10,000 for mechanical and 1000 for electrical.
  8. Fixed mounted only.
  9. Unit comes with 10 mounting brackets included.
  10. For replacement only.

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