Allen-Bradley 140MT-C3E-C10 Motor Protector Relay

Allen-Bradley 140MT-C3E-C10 Motor Protection Circuit Breaker (MPCB) in a C-frame is a compact protection device designed to safeguard three-phase motors in industrial control panels by combining thermal overload protection with short-circuit protection and by integrating with standard motor starters. It provides an adjustable thermal trip from 6.3 to 10 A, paired with a fixed magnetic trip at 14×Ie, delivering both time-delayed protection during overloads and immediate shutdown for severe faults, while accommodating a range of motor full-load currents. Rated for up to 690 VAC operation, this MPCB is commonly used with contactors in pump, conveyor, and fan applications, protecting motors in control panels and automatic equipment where reliable protection and simple coordination with starters are essential. The KN variant, 140MT-C3E-C10-KN, represents regional specifications and is listed as the replacement for the standard model; the device supports a -25°C to 70°C operating range in typical installations and uses a C-frame mounting for easy integration.