Brochure

PowerPact H-, J-, and L-Frame Circuit Breakers

Motor Circuit Protection

Electronic Motor Circuit Protectors (AC Only)

PowerPact H- and J-frame Electronic Motor Circuit Protectors (MCP) are 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. (See Section 3 for Accessories.)

The unique design of the PowerPact MCPs includes two rotary switches to allow quick setting

adjustments based on the characteristics of the motor.

The first rotary switch allows for Full Load Amperes (FLA) adjustment across the range of the frame size.

The second rotary switch selects the type of motor protection based on Automatic 1 for Standard

Efficiency or Automatic 2 for High Energy Efficient. 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. Rotary switch 2 also allows for traditional motor protection from 8 to 13 times the

selected FLA.

The MCP rotary switches are detented and allow the device to be set to specific trip values within a

typical accuracy range of +/-5%.

Full Load Amp Settings

1. Determine the motor’s full-load current by referring to the nameplate on the motor.

2. Set the trip range by turning the FLA rotary switch to the setting closest to the motor’s full load

current.

Automatic Protection Settings

The MCP microprocessor automatically adjusts the trip settings for both current and time to align with

the start-up characteristics for the motor type selected. This includes a dampening means to

accommodate a transient motor in-rush current without nuisance tripping of the circuit breaker.

Standard

Energy Efficient

Energie Efficace

Energia Eficiente

tandard

Energ

y Efficient

Energie Efficace

Energia Eficiente

(A) Full Load Amp Setting (FLA).

(B) Instantaneous Trip Point Settings (I