Littelfuse, Inc. Monitor - Relay Output 102A

The 102A is a three-phase voltage monitor designed to protect 190-480 V ac, 50/60 Hz motors by detecting harmful power line conditions such as phase reversal, voltage unbalance, and high or low voltage. It features an auto-ranging design that automatically selects between 200 V and 400 V operating ranges, a microcontroller-based sensing circuit, and adjustable trip delays of 4 seconds for voltage faults and 2 seconds for phase or unbalance faults. The relay has a SPDT contact rated for 10 A at 240 V ac and includes LED diagnostics with five distinct patterns to identify fault conditions. The unit mounts via #8 screws and measures 74.4 mm H x 133.9 mm W x 74.9 mm D. It operates from -40° to 70°C, meets UL508 and CSA 22.2 No. 14 standards, and complies with IEC 60947-6-2. Input power consumption is 5 W max, and terminal torque is 7 in.-lbs.