With switching relay 220 V, 2.2 kW (max.) and cooling water sensor made of borosilicate glass 3.3 with platinum twin electrode. The device switches off connected appliances permanently, if there is a shortage of cooling water. A visual and acoustic signal is emitted simultaneously. The relay is installed in the power supply line to the electrical appliances and the sensor is connected to the outlet of the cooling water line. Length of switching cable: 5 m.