An RCD, or residual current device, is a life-saving device which is designed to prevent you from getting a fatal electric shock if you touch something live, such as a bare wire. It can also provide some protection against electrical fires.
Here you can find a selection of RCDs intended for use in consumer units and enclosures.
2 Pole and 4 Pole.
30mA Trip, 100mA Trip, 300mA Trip, 500mA Trip, 110V and Time Delay.