Variable Earth Leakage relays are available from Cambridge Transducers . The variable earth leakage relays are available in compact 35mm din rail mounting cases for use on 3 phase electrical systems. The earth leakage relays can monitor earth leakage current to operate an associated relay at a preset current. The earth leakage relays can be used to shut down a system or operate an alarm under fault conditions.
Earth leakage relays are fitted with test and reset buttons. Pressing the test button allows a fault to be simulated and the output relays operate accordingly. Pressing the reset button after a fault occurs restores the unit back to its normal operation. A red LED light will illuminate after the unit trips due to an excessive fault current.