A remote actuator (ARD) is used to remotely switch connected circuit-breakers on and off. This significantly increases system availability. ARDs with an automatic function automatically switch the circuit-breaker back on. No reclosing occurs if a system error is detected. Series DFA devices are only designed for operation on Doepke residual current circuit-breakers DFS 2 or DFS 4. Depending on the design, the DFA devices are operated with different supply voltages, are fitted with relays to report the switching or locked status and either do not carry out any switch-on attempts or perform one or three attempts. The DFA devices are mounted to the RCCBs on the left.