These positive safety temperature cut-outs, (box mounted), with manual reset, are used to protect water heating systems against overheating.Circuit is open if the sensor is broken. Simple to install and use, these box-mounted liquid-expansion thermostats are fixed to the tank (or pipe) and heated via the supplied copper thermowell. IP40 box. Copper probe, length 95mm. Single-pole double-throw contacts, breaking capacity 15A at 250V, 10A at 400V Differential 6°K,. Max. working pressure: 10 bar.