Littelfuse, Inc.’s AF0500 Arc-Flash Relay features plug-and-play installation and a flexible design simplify retrofits and reduce cost. PC configuration is not required, and each input accepts either point- or fiber-optic sensors, saving cost. One AF0500 relay can be set up to trip different zones, eliminating the need to buy separate relays for each zone.

Unlike competing relays, the unique sensors used with the AF0500 are equipped with a visual indicator called Heartbeat™ that allows workers to verify at a glance that the sensors are properly operating and protection is active.

The AF0500 relay uses light sensors to detect arcing faults and send a trip signal to the circuit breaker in less than a millisecond. The reduced trip time lowers the incident energy and helps plants comply with OSHA and NEC standards for arc flash safety.

It combines all the important criteria needed in an arc flash relay — fastest reaction time, system health monitoring, ease of installation, scalability, and application flexibility — to protect workers and reduce downtime.