Allen-Bradley 809-A09E Instantaneous Trip Current Relay

The Allen-Bradley 809-A09E Instantaneous Trip Current Relay is a magnetically operated relay designed to provide immediate overcurrent protection in AC and DC motor circuits by tripping the protected path as soon as the current exceeds its preset instantaneous threshold. This specific A09E variant carries a 28-amp instantaneous trip rating, meaning it detects fault currents quickly and interrupts the circuit to prevent damage to motor windings, drives, and connected switchgear without relying on time-delayed protections. As part of Allen-Bradley's Bulletin 809 family, the device is intended for direct current monitoring of the protected conductor and integrates into standard protection schemes in industrial control panels and motor feeders where fast, reliable fault clearance is required in both AC and DC environments. Designed for rugged industrial use, the 809-A09E provides robust performance in demanding electrical installations and offers straightforward installation and compatibility with common Allen-Bradley protection architectures, delivering a dependable instantaneous trip solution for motor protection.