140M-F8E-C45 | Allen-Bradley Motor Protection Circuit Breaker, 32-45A

The 140M-F8E-C45 is a thermal-magnetic motor protection circuit breaker designed to protect three-phase motors from overloads and short circuits. It uses a bimetallic trip mechanism to respond to long-term overcurrent and a magnetic trip for instantaneous short circuit protection. This dual protection ensures that motors are safeguarded from both gradual and sudden electrical faults. It's especially useful in industrial automation systems where motor reliability is critical. This breaker contributes to increased operational safety and reduced equipment downtime.

The 140M-F8E-C45 supports an adjustable thermal current range between 32 and 45 Amperes. This setting allows users to match the breaker’s protection to the specific current characteristics of the connected motor. By adjusting the dial, the device can accommodate motors with different ratings within that range. This flexibility makes it suitable for diverse motor-driven applications. Proper adjustment ensures accurate overload protection and enhances motor lifespan.

Yes, the 140M-F8E-C45 is explicitly designed for three-phase motor protection. It monitors all three phases to detect unbalanced currents, overloads, and faults. This makes it ideal for motors in conveyors, pumps, compressors, and industrial automation. Three-phase compatibility is essential in high-power applications. Its robust design ensures consistent protection across all three phases.

If the 140M-F8E-C45 is no longer available in the future, Rockwell Automation typically recommends other 140M frame-size motor protection breakers in the same family. Alternatively, the 140U line or E100 electronic overload relays may serve as suitable replacements depending on the application. It’s important to match current, voltage, and interrupting capacity. Always verify compatibility with your motor and control system. Rockwell’s Product Compatibility and Migration (PCAM) tool can help identify suitable alternatives.

No, the 140M-F8E-C45 will be officially discontinued as of May 2, 2025, according to Rockwell Automation’s lifecycle announcement. After this date, it will no longer be available for sale, and customers are advised to remove it from new designs. Users are encouraged to transition to its engineering replacement, the 140MT-F9E-C45, which offers similar functionality with updated features. Planning a migration in advance ensures continued support and compatibility in motor protection systems. Always consult official product documentation and lifecycle tools to ensure proper replacement and compliance.