The earth leakage current are very low and are sensitive leakage current can be detected by earth leakage relay and core balance current transformer.
Earth leakage relay.
These relays are designed in such a way that whenever they sense a preset value of current usually settable between 10ma and 3a it trips the circuit breaker and interrupts the flow of current.
To be used with elr b elr 3c d30.
Earth leakage circuit breaker or elcb.
Elr detects the leakage current in the circuit and isolate the power supply by switching off the tripping device circuit breaker contactor etc.
It detects small stray voltages on the metal enclosures of electrical equipment and interrupts the circuit if a dangerous voltage is detected.
Means it detects the earth leakage current and.
Real time monitoring of leakage current.
Toroidal transformers ct1 ctd1.
Detection of no connection to zct zero phase current transformer.
Manual test button for relay operation checking.
Earth leakage protection measurement for low voltage.
Suitable for direct pulse current and immune to external disturbances.
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An earth leakage circuit breaker elcb is a safety device used in electrical installations with high earth impedance to prevent shock.
Earth leakage relays are normally used in low voltage circuits only.
Earth leakage relays are used to sense small magnitude of currents.