ALLEN BRADLEY 1756-OV32E

In North America, electrical codes require that an individual Motor Branch Circuit be protected by a UL/CSA Listed Fuse, Circuit Breaker or SelfProtected

 Combination Motor Controller.

140M-C, D, and F Frames

The 140M-C, D, and F frame Motor Protection Circuit Breakers may have two cULus Listings - as Manual, Self-Protected Combination Motor 

Controllers and as Manual Motor Controllers (with optional approvals for Motor Disconnect and Group Installation). Cat. No. 140M-D8V* can 

also be applied at the output of a variable frequency drive (VFD) in multi-motor applications. See Application Conditions (140M-D8V) on 

page 41 for more information. 

When UL/CSA listed as Manual, Self-Protected Combination Motor Controllers, the 140M Motor Protection Circuit Breakers provide all of the 

necessary NEC/CEC requirements for the protection and control of individual Motor Branch Circuits without additional protective devices.

At some higher voltages and currents (particularly at 600V), a few of the 140M-C, D, and F frame devices are only UL/CSA Listed as Manual 

Motor Controllers (with optional approvals for Motor Disconnect and Group Installation). In NEC/CEC Group Installations, these devices must 

be applied per the appropriate rules which require the use of an upstream Branch-Circuit, Short-Circuit Protective Device (BCPD). 

Type E and Type F Combination Motor Controllers

Most of the 140M-C…F motor protection circuit breakers are UL Listed as a manual Type E self-protected combination motor controller. Although 

there are many tests involved, one of the critical tests a self-protected combination motor controller must pass, is to perform 6000 electrical operations 

and an additional 4000 mechanical operations after a short circuit.

By definition, a Type F combination motor controller consists of a Type E manual self protected combination motor controller and a magnetic or 

solid-state motor controller (such as a Bulletin 100-C contactor or an SMC). As with a manual Type E self-protected combination motor controller, 

additional short-circuit protection is not required for the individual motor circuits.

A combination of a Bulletin 140M manual self protected combination motor controller and 100-C contactor can be listed as a Type E selfprotected

 combination motor controller. In this case, both the 140M and 100-C must pass the additional 6000 electrical and 4000 mechanical 

operational test. In some cases, this may require over sizing of the Bulletin 140M MPCB or the 100-C contactor to achieve weld free performance 

and meet the additional life requirements.