Siemens Overload Relay NO/NC, 4 A, 0.05 W, 230 V ac. Pole Configuration: 3P. Range: Sirius Classic. Contact Voltage Rating: 1 kV ac. Mounting Style: Direct Mount. Series: 3RB20. Reset Method: Automatic, Manual, Remote. Terminal Type: Screw. Depth: 155mm. Width: 95mm. Length: 120mm. MPN: 3RB2056-1FW2