Littelfuse, Inc. AF0500 Series – Arc-Flash Relay AF0500-00-CC

The AF0500-00-CC is a conformally coated arc-flash relay that detects optical arc faults and rapidly trips feeder breakers to limit damage. It accepts four optical sensor inputs compatible with PGA-LS10 point sensors and PGA-LS20/LS30 fiber-optic sensors, with trip times under 1 ms and dual IGBT trip outputs for redundancy. The unit operates from a universal power supply of 100-240 Vac or 24-48 Vdc, features an Ethernet interface with Modbus® TCP communication, and includes an onboard event recorder with 2048 log lines. It measures 130 mm H × 200 mm W × 54 mm D and is designed for DIN-rail mounting with optional clips. The relay supports zone, tie, and upstream breaker tripping, and is UL Listed (UL508), CE, RCM, FCC, and CSA certified. It operates from -40°C to +70°C and carries a five-year warranty.