Under normal conditions, the current from the source flows into the load through the live wire & flows out of the load through the neutral wire. It cannot protect against overloading or short circuit current. It monitors the leakage current that flows out of the circuit through any unintended path.

Therefore, they must be used in series with an MCB (miniature circuit breaker).ĮLCB is a safety device whose main function is to prevent electrical shock. They do not offer protection against overloading or short circuit. The earth leakage can cause electrical shocks that can be fatal.ĮLCB is mainly used for protection against electrical shock. it breaks the circuit & disconnects the power supply to the load when it senses the leakage current.

MCCB (Molded Case Circuit Breaker) – Construction, Types & WorkingĮLCB or Earth Leakage Circuit Breaker is a type of circuit breaker that is used for protection against leakage current.

MCB (Miniature Circuit Breaker) – Construction, Working, Types and Applications.

Upon touching the conductor or the equipment, the current can pass to the earth through the person’s body. It can also occur when the live conductor comes in contact with the body of the equipment (if the equipment is not properly grounded). It can occur due to damaged insulation of the live conductor or broken conductors. Therefore, protection devices are used to disconnect the power source when such current leakage is detected Causes of Earth Leakage?Įarth leakage can occur due to various reasons.

The consequence of electrical shock may prove fatal if the leakage current exceeds the only 30mA. It may flow between their poor insulation or through a person’s body & cause electrical shock. The electrical current that flows from the live conductor to the earth through an unintended path is called earth leakage.

Autocad mcb symbol