Overview
The Allen-Bradley 140M-C2E-B10 is a frame C motor protection circuit breaker designed to provide overload and short-circuit protection for small industrial motors. This compact unit combines thermal and magnetic trip protection in a single package, delivering reliable performance for branch-circuit motor control in panel-mounted or standalone applications. The 140M-C2E-B10 supports adjustable current settings from 0.63 to 1.0 A, making it ideal for fractional-horsepower and small integral-horsepower 3-phase motors.
Key Features
- Adjustable Thermal Overload Protection: Current range 0.63–1.0 A with Class 10 trip characteristic (trips within 10 seconds under overload conditions).
- Fixed Magnetic Short-Circuit Trip: Set at 13× the maximum rated current (13 × Ie) for rapid disconnection during faults.
- Three-Pole Design: Provides comprehensive phase protection for 3-phase motor circuits.
- UL/CSA Listed: Meets UL 508 standard as a manual self-protected combination motor controller and manual motor controller.
- DIN Rail Mounting: 35mm rail-mount design with rotary handle and lockable twist knob for secure manual operation.
- Status Indication: Trip and test buttons provide visual confirmation of overload or fault conditions.
Technical Specifications
- Current Range: 0.63–1.0 A (adjustable thermal)
- Magnetic Trip Setting: 13 × Ie (fixed)
- Voltage Rating: Up to 690 V AC
- Poles: 3-pole
- Mounting: DIN rail (35 mm)
- Trip Class: Class 10 (thermal)
- Certifications: UL/CSA Listed, UL 508
- Control Type: Manual self-protected combination motor controller
- Series: 140M-C2E
- Frame Size: C
Typical Applications
The 140M-C2E-B10 is commonly used in industrial automation and motor control systems, including:
- Small 3-phase motor branch circuits (fractional-horsepower to ~0.75 kW)
- Standalone motor protection in control panels
- Group motor installations with a single branch-circuit protective device
- Manual motor starters providing overload protection with separate short-circuit protection
- European-standard IEC motor applications
Compatibility & Replacements
Compatible With
- 3-phase AC motor circuits (50 Hz / 60 Hz)
- DIN-rail mounted control panel assemblies
- Allen-Bradley manual starters and combination controllers
- Group motor installations with external short-circuit protection
- Industrial automation systems requiring manual motor control
Replaces / Drop-In Replacement For
The 140M-C2E-B10 was discontinued by Rockwell Automation effective February 25, 2022. For new installations, use the engineering replacement:
- 140MT-C3E-B10 – Modern equivalent with updated design and continued manufacturer support
Works With
- 100-C series contactors (for Type F combination motor controllers)
- Manual motor control circuits (no PLC or networked control required)
- 24 VDC or 120 VAC auxiliary control circuits (with optional accessory contacts)
- Standard electrical panel layouts and DIN rail systems
- UL/CSA-listed motor branch-circuit applications per NEC/CEC codes
