Wylex WRDS40/2 Type A RCD 40A 30mA 2 Pole 2 Module\r\n- Operating dolly may be locked in either on or off positionFully shrouded terminals- Contact position indication on the dolly handle- DIN rail mounted- Type A RCD\r\nWylex Lifeline Range WRDS40/2 Type A RCD 40A 30mA double pole with two module. The device is required when RCD protection is needed in a consumer unit, which gives it extra protection against transient surges and reduces unwanted tripping.