PowerPact™ H- and J-Frame Electronic Motor Circuit Protectors

Class 611 / Refer to Catalog 0611CT1001

Motor Circuit Protection Selection

PowerPact H- and J-frame electronic Motor Circuit Protectors (MCP) are magnetic-only instantaneous-trip circuit breakers. They are designed to offer short circuit protection and are National Electrical Code (NEC) compliant when installed as part of a combination controller having motor overload protection. MCP circuit breakers accept the same accessories and terminals as the equivalent thermal-magnetic circuit breakers.

Determine the hp rating from the nameplate of the motor. Select a MCP with an ampere rating recommended for the hp and voltage involved. When using the automatic settings the MCP microprocessor automatically adjusts the trip settings for both current and time to align with the start-up characteristic for the motor type, whether it is a standard or energy-efficient motor. This includes a dampening means to accommodate a transient motor in-rush current without nuisance tripping of the circuit breaker.

H- and J-Frame Electronic Motor Circuit Protectors (MCP)

Frame

Sensor Rating

Full Load Amperes Range

Adjustable Instantaneous Trip Range

Suffix

Interrupting Rating

J
(See SCCR Table Below)
Cat. No.

L
(See SCCR Table Below)
Cat. No.

R
(See SCCR Table Below)
Cat. No.

H-Frame

30 A

1.5–25 A

9–325 A

M71

HJL36030M71

HLL36030M71

HRL36030M71

50 A

14–42 A

84–546 A

M72

HJL36050M72

HLL36050M72

HRL36050M72

100 A

30–80 A

180–1040 A

M73

HJL36100M73

HLL36100M73

HRL36100M73

150 A

58–130 A

348–1690 A

M74

HJL36150M74

HLL36150M74

HRL36150M74

J-Frame

250 A

114–217 A

684–2500 A

M75

JJL36250M75

JLL36250M75

JRL36250M75

Maximum Rating or Setting of Motor Protective Devices [1]

Type of Motor

Percentage of Full-load Current

Setting

Not to Exceed[2]

A, B, C, D

Standard

800%

1300%

B, E

Energy Efficient

1100%

1700%

MCP Selection by HP Ratings [3] of Induction-type Squirrel-Cage and Wound-Rotor Motors [4]

3Ø 60 Hz Voltages [5]

Full-Load Amperes

Suffix

200 Vac

230 Vac

460 Vac

575 Vac

.5–5

.5–7.5

.75–15

1–20

1.5–25

M71

5–10

5–15

10–30

15–40

14–42

M72

10–25

15–30

25–60

30–75

30–80

M73

20–40

25–50

50–100

60–125

58–130

M74

40–60

50–75

100–150

125–200

114–217

M75

Short Circuit Current Rating (SCCR)

Tested to meet NEC and UL508A requirements for short circuit current ratings as part of an approved combination controller.

Short Circuit Current Ratings (SCCR)

Contactor/Starter

Interrupting Rating

J

L

200–240 Vac

480 Vac

600 Vac

200–240 Vac

480 Vac

600 Vac

Tesys D-line and F-line

100 kA

65 kA

25 kA

125 kA

100 kA

50 kA

NEMA Type S

100 kA

65 kA

25 kA

125 kA

100 kA

50 kA

See www.us.schneider-electric.us for specific ratings and combination ID numbers.

To select combination starters and motor controllers using MCP’s Meeting NEC Article 430, refer to Section 16.

Footnotes

  1. Based on 2005 NEC Table 430.52.
  2. See NEC Exception No. 1 to Table 430.52. The NEC 1300% maximum setting may be inadequate for instantaneous trip circuit breakers to withstand current surges typical of the magnetization current of autotransformer type reduced voltage starters, or open transition wye-delta starters during transfer from “start” to “run,” constant hp multi-speed motors, and motors labeled “high efficiency.”
  3. Based on 2005 NEC Table 430.250.
  4. Per NEC 430.3, part-winding motors should select two circuit breakers, each at not more than one-half the allowable trip setting for the horsepower rating. The two circuit breakers should operate simultaneously as a disconnecting means per NEC 430.103.
  5. Listed voltages are rated motor voltages. Corresponding system voltages are 200 Vac, 220–240 Vac, 440–480 Vac and 550–600 Vac. Select wire and circuit breakers based on horsepower rather than nameplate full-load current per NEC 430.6 (A) for general motor applications.

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