ClimaSys PTC heating resistance insulate. 20W, 110-250V AC, 50/60 Hz. (-40 to 70)°C temp for operation. Electrical connection is 4 screw terminals 2.5 mm². 35 mm DIN rail mounting support. Extruded aluminium body. IP20, Insulation Class II. Electrical protection needed, must be installed with a thermal controller.