Masterplug power cut safety rcd adaptor masterplug rcd981 p buy masterplug power cut rcd safety adaptor ndash a 13a plug in residual current device which provides effective fast acting double pole protection against defective wiring or earth leakage a sensor in the adaptor monitors the current flow and automatically cuts off the power in the event of even a minute leakage to earth significantly reducing the risk of electrical shock p masterplug rcd981 power cut rcd safety adaptor