ELCB or Earth Leakage Circuit Breaker is a electrical device used to sense currents leakage and stops the power supply to avoid from shock to any person.

Earth-leakage circuit breakers (ELCBs) are safety devices used in electrical equipment with high ground impedance to prevent electric shock. It detects small parasitic voltages in the metal housing of electrical equipment and shuts off the circuit when the voltage level exceeds the hazard threshold.

Surgery. ELCB is a special type of latch relay that has power from the input mainstream of a building connected through switch contacts so that ELCB powers off when a ground fault is detected. ELCB detects the current fault current to the ground wire (earth) in the equipment that protects it.  https://gizalus.com

What is the purpose of ELCB?

The main purpose of ELCB is to detect earth leakage, prevent people from electric shock, and prevent electric fire due to short circuit. How does ELCB protect?

The ELCB is a special type of latch relay that connects the power from the building’s input mains through switch contacts, allowing the ELCB to disconnect in a ground fault (unsafe) condition. ELCB detects the fault current from the hot wire (hot) to the ground wire (earth) in the equipment that protects it. If a high voltage is generated across the ELCB sensor coil, the ELCB sensor coil will turn off and remain off until manually reset. Therefore, it protects the electrical system of the building.

Surgery. The ELCB is a special type of latch relay in which the power from the building’s inbound mains is connected through switch contacts, so the ELCB shuts off when a ground fault is detected. ELCB detects the current fault current to the ground wire (earth) in the equipment that protects it.

The principle of operation of an earth-leakage circuit breaker or RCCB is also very simple like a voltage-driven ELCB, but the theory is completely different and the switch is more sensitive than the ELCB.

There are actually two types of ELCBs, but voltage-based ELCBs are commonly referred to as simple ELCBs. The current ELCB is also known as RCD or RCCB. Here, power is supplied to the CT (current transformer) cores of the neutral wire and the phase wire. ELCB single-phase residual current. The polarities of the phase and neutral windings of the core are chosen so that the magneto motive force of one winding under normal conditions is opposite to the magneto motive force of the other winding.

If there is no leakage in the centre, it is assumed that the current flowing through the phase line is returned by the neutral line under normal operating conditions.

Since both streams are equal, the resulting mmf produced by these two streams is also ideally zero.

The relay coil is connected as the secondary side of another third winding of the CT core. The terminals of this winding are connected to the relay system.

For BSES new Connection ELCB is mandatory to be installed on every new connection who has sanction load is above 2 Kw.