The Allen-Bradley Bulletin 140MP Motor Protection Circuit Breakers (MPCBs), also known as Motor Protective Switching Devices (MPSD), provide both magnetic short-circuit and thermal overload protection for electric motors. Rated up to 32 A, these devices are essential components in industrial motor control applications, offering a compact and reliable solution for branch circuit protection.

These circuit breakers are specifically tested in combination with Allen-Bradley Bulletin 100-C and 100-K contactors to create two-component motor starters, simplifying system design and reducing engineering effort. They meet the requirements of Motor Protective Switching Devices (MPSD) per IEC 60947-4-1 and circuit breaker standards per IEC 60947-2, ensuring compliance with international regulations for use outside North America.

Key features include Class 10A overload protection, phase loss sensitivity for enhanced motor protection, and an integrated disconnect function. The devices are suitable for both three-phase and single-phase applications, offering flexibility across various motor types. With interrupting ratings at 400V up to 100 kA, the 140MP provides robust short-circuit protection for demanding industrial environments.

The 140MP is UL listed as a Manual Motor Controller with optional approvals for Suitable as Motor Disconnect and Suitable for use in Group Installation. Group motor installations eliminate the need for individual branch short-circuit protective devices for each motor circuit, significantly reducing panel space, installation time, wiring complexity, and overall costs. Only one Branch Circuit Protective Device (BCPD) is required for the entire group.

Additional capabilities include overload protection (thermal), short-circuit protection (magnetic), manual switching (motor control means), and optional UL group motor and IEC Type 1 and Type 2 coordination. The devices carry multiple certifications including CE, cULus, CCC, KC, EAC, IEC, CB Scheme, and Global RINA (Marine), making them suitable for international applications.

Technical specifications include a rated impulse withstand voltage (Uimp) of 6 kV, insulation voltage (Ui) of 690V, operating frequency of 50/60 Hz, and 3-pole configuration. Mechanical and electrical operations rating is 100,000 cycles for 0.1-16 A units and 50,000 cycles for 20-32 A units. The device features a turn button control element, screw connection for main circuit, DIN rail mounting (EN 60715), IP20 housing protection, and an operating temperature range of -25°C to +70°C (open) or 0°C to +40°C (enclosed).

Common applications include motor control centers, industrial machinery, conveyor systems, pumps, fans, compressors, and various automation systems requiring reliable motor branch circuit protection.