Bulletin 140M Motor Protectors

The Allen-Bradley Bulletin 140M Motor Protectors are a family of Motor Protection Circuit Breakers (MPCBs) and Motor Circuit Protectors (MCPs) designed to provide overcurrent protection and disconnecting means for motor branch circuits. The catalog number encodes critical selection data: the frame letter following 140M- indicates the rating class (C and D = 32 A frame, F = 45 A frame), while the next digit identifies interrupting capacity (2 = Normal Break, 8 = High Break). The protection-type character that follows — E, T, V, or N — distinguishes between adjustable thermal/fixed magnetic variants and fixed-magnetic-only MCP configurations, including a V-type suited for VFD output and multi-motor applications. The current range code (e.g., B25 = 2.5 A, C10 = 10 A, C45 = 45 A) defines the adjustable Ie window. Optional suffixes specify accessories such as lockable knobs (KN, KRY), busbar mounting hardware (MT), auxiliary trip contacts, and shunt or undervoltage trip modules. The family's broad accessory ecosystem — including compact busbars, connecting modules rated up to 37 A, and feeder blocks — supports both panel and busbar installation configurations. Consult the Bulletin 140M Technical Data (140M-TD002) for complete selection guidance.