Electronic top hat rail thermostat / top hat rail temperature controller THERMASREG® TET for installation in distributor boxes or control cabinets, with switching output, multi-range switching and adjustable hysteresis. It is used for electronic controlling and monitoring of temperatures with remote sensor in the residential sector (e.g. in connection with floor heating systems), in halls and greenhouses and in the industrial sector. This controller has sensor breakage detection and a switch-off function.