Section 4—PowerPacT M-Frame Molded Case Circuit Breakers

M-Frame Unit-Mount

M-Frame I-Line

PowerPacT M-frame molded case circuit breakers provide improved performance and a compact solution for applications up to 800 A. The electronic trip unit simulates the function of a thermal magnetic trip unit, but provides precise tripping and is not sensitive to temperature changes. The adjustable amperage version has a selector switch allowing it to be set to the desired amperage. This can be sealed behind a clear door with the seal kit which is included with the circuit breaker.

• Available in 400 and 600 A fixed trip unit, and adjustable 300–800 A trip unit.

• Available in two- and three-pole unit-mount and I-Line versions

Termination Options

Frame	Termination Letter	Termination Option
M-Frame	F	No Lugs
	A	I-Line
	L	Lugs both ends
	M	Lugs ON end Terminal Nut Kit Off end
	P	Lugs OFF end Terminal Nut Kit On end
For factory-installed termination, place termination letter in the third block of the circuit breaker catalog number.

• Built-in electronic trip unit type provides better accuracy than standard thermal-magnetic trip units.

• Fixed long-time and adjustable instantaneous protection (2 to 10 times nominal ampere rating) is standard.

• Available in 400 and 600 A with a fixed amperage rating, and an adjustable amperage rating ranging from 300 to 800 A.

• Same dimensions, common mounting, bussing, cabling and door cut-out as PowerPacT P-frame circuit breakers.

• A full range of electrical accessories are available:

• Shunt trip (various AC and DC voltages are available)

• Undervoltage trip (various AC and DC voltages are available)

• Time delayed undervoltage trip (various AC and DC voltages are available)

• Auxiliary switches (up to 3A/3B); low-level switches are also available (voltage and amperage)

• Alarm switch (1A/1B); low-level switches are also available (voltage and amperage)

• Overcurrent trip switch (SDE)

• A full range of mechanical accessories are available:

  • Standard mechanical lugs (aluminum or copper)

  • Crimp (compression) lugs (aluminum or copper)

  • Power distribution lugs (aluminum only)

  • Bus connector kit

  • Inter-phase barriers

  • Door escutcheons (for toggle or accessory cover)

  • Padlocking device (removable or fixed version), complies with OSHA requirements

  • Key-lock device (Kirk^® or Schneider Electric keylocks)

Unit-mount circuit breakers have mechanical lugs standard on both ends. I-Line circuit breakers have lugs standard on the OFF end. These lugs accept aluminum or copper wire. See Mechanical, Compression, and Distribution Lugs for more lug options.

Accessories are available either factory- or field-installed. They can be installed in accessory compartments behind the circuit breaker accessory cover. See Accessories Catalog Numbers for available accessories.

Control wiring is connected to terminals located under the circuit breaker accessory cover.

Function	Connector	Description	Remote Operation	Alarm Contact
Auxiliary Contacts	OF	Open/Closed Circuit Breaker Position Contacts
	SD	Bell Alarm
Remote Operation	MN	Undervoltage Trip Device
	MX	Shunt Trip