A Residual Current Device (RCD) is the generic term for safety devices that automatically switches electricity off when a current leakage occurs. These devices monitors the Residual current levels compared with the rated nominal tripping current to disconnect the supply of power. By doing so, it protects users against any electrical hazards such as accidental electrocution, equipment malfunctions & fire hazards. Due to the nature of the RCD, when a leakage current has exceeded the designated RCD?s threshold value, intermittent RCD tripping will occur more frequently.