Our motor protection circuit breakers provide both short-circuit and overload protection for individual motor loads and are available for a wide range of motor sizes and installation types. They can be combined with our NEMA and IEC contactors or solid-state motor controllers.
Motor Protection Circuit Breakers
140MT Motor Protection Circuit Breakers
Our Bulletin 140MT motor circuit protectors offer enhanced ratings that enable assembled starters to be applied without additional branch circuit protection. Tap conductor ratings allow smaller conductors in group motor installations, saving you money. Motor circuit protectors are applied with a separate overload relay for three-component starters.
140MP Motor Protection Circuit Breakers
Our Bulletin 140MP Motor Protection Circuit Breakers (MPCBs) provide magnetic short-circuit and thermal overload protection up to 32 A, with an interrupting rating @400V of up to 100 kA. They are tested in combination with Allen-Bradley Bulletin 100-C and 100-K contactors to create two-component motor starters.
140MG Motor Protection Circuit Breakers
Our Bulletin 140MG Motor Protection Circuit Breakers can provide a disconnecting means for motor branch circuit, branch-circuit and short-circuit magnetic protection, overload thermal protection, and manual switching. We offer devices rated from 25...150 A to meet your particular needs. Our factory-installed internal accessories make installation and wiring easy. In North America, electrical codes require that an individual Motor Branch Circuit be protected by a UL/CSA Listed Fuse, Circuit Breaker, or Self-protected Combination Motor Controller.
140M Motor Protection Circuit Breakers
Rockwell Automation announces that as of March 2022, our Bulletin 140M Motor Protection Circuit Breakers will be discontinued and no longer available for sale. We recommend you migrate to our Bulletin 140MT Motor Protection Circuit Breakers.
These motor protection circuit breakers feature extended current range for C-frame (32A) and D-frame (40A) models. 140M F-frame products will remain available.
Learn more, Bulletin 140M to 140MT/UT Motor Protection Circuit Breakers Migration Profile.