Residual current device with no-volt release switch which gives extra protection as it has to be reset manually in case of a power cut. Portable for connecting to earthed wall socket. Trips at leakages of 30 mA. Equipped with test function and indicator. 230 V/16 A. IP44. Class A, S-marked. This is how an RCD works: If a fault occurs in a damaged lead or electric appliance, e.g. an iron, drill, or toaster, the current may be conducted through you if you are in contact with an earthed object such as a sink. The RCD trips if the current takes another route than the intended one. RCDs must not be used instead of other safety precautions such as earth connections. The RCDs we sell trip at 30 mA leakage and work in earthed and non-earthed sockets.