Product brand name SIRIUS Product designation Power contactor Product type designation 3RT2 General technical data Size of contactor S0 Product extension ● function module for communication No ● Auxiliary switch Yes Surge voltage resistance ● of main circuit rated value 6 kV ● of auxiliary circuit rated value 6 kV maximum permissible voltage for safe isolation ● between coil and main contacts acc. to EN 60947-1 400 V Protection class IP ● on the front IP20 ● of the terminal IP20