140MT-C-TE

Overview of Allen Bradley 140MT-C Motor Protection Circuit Breaker

The Allen Bradley 140MT-C is a versatile motor protection circuit breaker (MPCB) engineered for protecting and controlling AC motors in industrial environments. As part of the Allen Bradley 140MT series, the 140MT-C integrates both short-circuit and overload protection within a compact footprint, reducing panel space and wiring complexity. This breaker helps safeguard motors against overheating, phase failure, and short circuits during startup and operation. The thermal and magnetic trip elements are adjustable to fine-tune protection according to the specific motor’s current profile, supporting a wide range of motor sizes. With compliance to international standards including UL 60947-4-1 and CSA C22.2, it offers reliable performance and safety in applications that demand consistent uptime and minimal maintenance.

Key Features of Allen Bradley 140MT-C Motor Protection Circuit Breaker

• Integrated overload and short-circuit protection (Trip Class 10)
• Thermal and magnetic tripping with adjustable thresholds
• Available in C frame for currents up to 32A
• Compact 45mm profile for easy panel integration
• High interrupting capacity (up to 100 kAIC at 400/415V)
• Compliant with global safety standards (cULus, IEC)
• Long mechanical (100,000 ops) and electrical (100,000 ops) lifespan

Technical Specs of 140MT-C

• Current range: 0.1–32A (adjustable based on variant)
• Frame: C (32A max, 45mm width)
• Trip class: Class 10 (typical, thermal/magnetic)
• Rated insulation voltage: 600Y/347V
• Impulse withstand voltage: 6 kV (main), 8 kV (disconnect)
• Interrupting capacity: up to 100 kAIC at 400/415V AC
• Ambient operation: -25°C to +40°C
• Mechanical life: 100,000 operations
• Mounting: DIN rail or base plate

Applications / Use Case

Allen Bradley 140MT-C motor protection circuit breakers are suited for protection and manual control of AC motors across a variety of industries. Typical environments include manufacturing plants, water treatment facilities, material handling systems, and HVAC installations. The device is optimal for scenarios where reliable protection from overloads and short circuits is essential to prevent costly downtime and equipment damage. Engineers choose the 140MT-C for its ability to serve both as a manual motor starter and protective device in motor control centers or distributed control panels. Its compact size and flexible adjustment range make it a practical fit for both greenfield projects and retrofit upgrades where space and safety compliance are priorities.

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