<P> To eliminate this confusion, IEC decided to apply the term residual current device (RCD) to differential - current - operated ELCBs . Residual current refers to any current over and above the load current...</P> <P> An ELCB is a specialised type of latching relay that has a building's incoming mains power connected through its switching contacts so that the ELCB disconnects the power when earth leakage is detected . </P> <P> The ELCB detects fault currents from live to the Earth (ground) wire within the installation it protects . If sufficient voltage appears across the ELCB's sense coil, it will switch off the power, and remain off until manually reset . A voltage - sensing ELCB does not sense fault currents from live to any other Earthed body . </P> <P> There are two types of Earth - leakage circuit breaker: </P>

Tripping time of elcbs is usually less than