11-25-2021, 01:17 AM
because the "OMRON" relay work with MAX250V load voltage. so if greater then AC250V , the varistor will disconnect, let is bad to protect the relay. "overvoltage" is for load's power, sometimes maybe someone connect with AC380V load, or have mistake connect the relay with high voltage (>AC 250V) , so the varistor will work as a "fuse".