Unlike competing products, the unique sensors used with the AF0500 are equipped with a visual indicator called Heartbeat™ to monitor the health of the sensor. Heartbeat™ indication allows workers to verify immediately that the sensors are properly operating and offering protection without inspecting the relay, which is often located in another compartment. "The key selection criteria customers need in an arc-flash relay - fastest reaction time, complete system health monitoring, ease of installation, unlimited scalability, and application flexibility - are all packaged in the new AF0500 Arc-Flash Relay," said Jakob Seedorff, Technical Director, Littelfuse. In addition to lowering costs of installation and maintenance, the AF0500 Arc-Flash Relay reduces the total project cost by allowing for a flexible mix of point sensors and fiber optic sensors using the same inputs. One AF0500 relay can also be set up to trip different zones, eliminating the need to buy separate relays for each zone.