140M-C2E-B63 | Allen-Bradley Motor Protection Circuit Breaker 4.0–6.3 A

The Allen-Bradley 140M-C2E-B63 is a motor protection circuit breaker designed to protect motors from overload, short circuit, and phase failure conditions. It serves multiple roles, including branch circuit disconnect, manual switching, and magnetic protection. Its adjustable thermal protection allows it to match specific motor current ratings, ensuring optimal safety and reliability. This circuit breaker is widely used in industrial motor control centers and automation panels. It supports direct control of motors without requiring external contactors in many cases. Its manual switching feature also makes it useful for maintenance and local isolation.

The breaker provides adjustable thermal protection and fixed magnetic protection. The thermal mechanism protects against prolonged overloads by monitoring motor current over time. The magnetic protection responds instantly to short-circuit currents exceeding 82 A. This dual-functionality ensures comprehensive motor and wiring protection. It helps maintain uptime and avoids damage to equipment. This makes the breaker suitable for many industrial motor applications requiring precise and fast-acting safety features.

The 140M-C2E-B63 is ideal for small to medium industrial motors with operating currents in the 4–6.3 A range. It supports 3-phase motors with horsepower ratings of 1.5 HP at 200 V, 2 HP at 230 V, and 5 HP at 460/575 V. For kilowatt ratings, it supports up to 4 kW at 690 V. These specs make it suitable for applications like conveyors, fans, and pumps. It is typically used in automation systems where reliable overload and short-circuit protection is needed. The breaker is also rated for use in group motor installations.

The breaker is mounted directly onto a standard 35 mm DIN rail, making installation quick and tool-free. This standard mounting method allows for flexible layout changes and fast replacements. It supports modular accessories that can be added without removing the device. The DIN rail installation ensures good mechanical stability and electrical grounding. This mounting format is widely accepted in industrial control panels and MCCs. The breaker’s design is optimized for secure and neat panel integration.

No, the Allen-Bradley 140M-C2E-B63 was officially discontinued on February 25, 2022. Rockwell Automation no longer manufactures or sells this motor protection circuit breaker. Customers are advised to remove it from new design specifications and consider the recommended replacement. The official engineering replacement is the 140MT-C3E-B63, which offers updated features and improved performance. Transitioning to the 140MT series ensures continued product support, availability, and compatibility with modern systems. Always refer to Rockwell’s migration guides when planning a replacement.