Overview
The Allen-Bradley 140M-C2E-B40 is a Class 10 manual motor protection circuit breaker engineered for industrial motor branch circuits and machine control panels. This C-frame, 3-pole unit combines disconnect, overload protection, and short-circuit magnetic protection in a single compact device rated for 600V AC service. UL/CSA listed as a Manual Self-Protected Combination Motor Controller (Type E), it meets NEC/CEC requirements for individual motor branch circuit protection without additional protective devices.
Key Features
- Adjustable Thermal Trip: Precisely set overload protection between 2.5–4 A to match motor full-load current ratings.
- Fixed Magnetic Trip: 13× Le standard magnetic trip setting provides rapid short-circuit response and high current limiting (up to 1200 A breaking capacity).
- Class 10 Tripping: Trips in 10 seconds or less on overload for reliable motor protection and emergency shutdown.
- Manual Operator: Lockable twist-knob manual switching with visible trip indication and screw terminals for field wiring.
- DIN Rail Mounted: Compact footprint optimized for panel integration; standard 35 mm rail installation.
- Global Certifications: UL508 listed for manual motor controller and combination motor control applications; 50/60 Hz rated.
Technical Specifications
- Part Number: 140M-C2E-B40 /B
- Manufacturer: Allen-Bradley (Rockwell Automation)
- Type: Motor Protection Circuit Breaker, Frame C
- Poles: 3
- Voltage Rating: 600 V AC
- Adjustable Current Range: 2.5–4.0 A
- Magnetic Trip: Fixed at 13× Le
- Breaking Capacity: 1200 A (standard)
- Trip Class: Class 10 (≤10 seconds on overload)
- Mounting: DIN Rail (35 mm)
- Operator: Manual twist-knob with lockable feature
- Frequency: 50/60 Hz
- Application Category: CAT A (utility/industrial)
- Weight: 0.71 lbs
Typical Applications
- Small to mid-size motor branch circuits (fractional to ~3 HP)
- Machine tool and industrial equipment motor control
- Pump and compressor motor protection
- HVAC and ventilation system motor circuits
- Process automation and conveyor systems
- OEM control panel integration requiring combined disconnect and overcurrent protection
Compatibility & Replacements
The Allen-Bradley 140M-C2E-B40 is part of the extensive 140M motor protection family and is fully interchangeable with other C-frame 2.5–4 A 140M-C2E models. For upgrades, Rockwell Automation’s 140MT-C3E-B40 serves as the modern direct replacement, offering enhanced features and extended availability. Both breakers share the same DIN rail footprint and electrical interfaces, enabling straightforward panel retrofit without redesign. Verify current ratings and voltage before substitution, and confirm compatibility with existing control-circuit interlocks or contactors (such as Bulletin 100-C units).
