SMJ Electrical RCD adaptor (Clam Pack) RCDAWC An RCD adaptor (circuit breaker) protects against the risk of electrocution and is approved to the latest European standards. Can be used with any 240V appliance. Double pole protected. Cuts power in 30ms when an imbalance is detected to prevent electrocution. Essential for use in high risk areas such as outdoors ponds and pressure washers.