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5 How does the residual current device work? In simple terms, the RCD is a circuit breaker that continuously compares the active current to the neutral current. Voltage Independent RCD. Voltage independent RCDs use the energy of the earth fault current to trip the mechanism directly. In this type of RCD, the output from Thus, during the electrical faults, the paper studies the function and importance of highly sensitive residual current device (RCD) and its defensive techniquesRCD is a generic term which embraces the various forms such as RCCB, RCBO, etc. Residual Current Devices are now firmly established around the world as a Residual current: Vector sum of the instantaneous values of current flowing in the main circuit of an RCD. 2. DEFINITION. Page 3. 21-22 July 2011, KLCC. An RCD works on the principle of comparing currents in live conductors passing through its summation current transformer. In normal conditions (no RCDs work equally well on single phase, three phase or three phase and neutral circuits, but when the neutral is distributed it is essential that it passes