The ABB EH04 are auxiliary contact blocks which can be used in combination with all the new ESB and EN installation contactors. These devices are available in 2 different contact configurations and no tool is needed for their assembling. Rated Operational Voltage:Auxiliary Circuit 500 V AC Rated Frequency (f):Auxiliary Circuit 50 Hz Auxiliary Circuit 60 Hz Rated Impulse Withstand Voltage (Uimp):Auxiliary Circuit 4 kV Rated Insulation Voltage (Ui):500 V Degree of Protection:IP20 Tightening Torque:Auxiliary Circuit 0.9 N·m