The CM-MSS.31S belongs to the CM-MSS Thermistor Motor Protection Relay range. It operates with a rated control supply voltage of 24 to 240 VAC/VDC and has a 1NC-1NO (SPDT) output with contacts rated at 250 V/4 A. It features one sensor circuit to monitor PTC temperature sensors and works according to the closed-circuit principle. The sensor circuit of the CM-MSS.31S is short-circuit, as well as interrupted-wire monitored and the relay can be reset automatically, manually or remotely after the failure has been removed. This protection relay is certified according to the ATEX directive 94/9/EC and is equipped with a reset/test button. A sealable transparent cover for protection against unauthorized changes is available as accessory. The device offers screw connection technology with double chamber cage connection terminals.