![]() Difference Between MCB, MCCB, ELCB and RCB, RCD or RCCB Circuit Breakers.They are more efficient, reliable & best at providing protection against any kind of leakage current. Therefore, if you have installed any old voltage ELCBs in your home, replace them with current ELCB or RCCB. It has far more disadvantages than advantages & they are obsolete. Electrical equipment that normally leaks voltage might trip ELCB unnecessarily.It is less sensitive & cannot detect low leakage current.It requires an extra connection with the body of the equipment & earth.It only trips when the leakage current flows through the earth conductor.It cannot prevent electrical shock in case of touching the phase conductor directly.It cannot sense the current leakage from phase to any other earthed body.By doing so, the latch break opens the contacts & disconnects the power supply to the equipment & prevents electrical shock. When the current exceeds a certain limit, the relay produces sufficient force to pull the latch. The relay starts to generate electromagnetic force. As a result, the current starts to flow through the coil & it is energized. If the live wire breaks or its insulation fails & comes in contact with the body of the equipment, a voltage difference appears across the terminals of the coil. The coil can sense the voltage difference between the earth & the body of the equipment. One of the terminals of the relay coil is directly connected to the earth while the other terminal is connected to the body of the equipment. These terminals are actually connected with the electromagnetic relay & they play a vital role in breaking the circuit during current leakage. It has two extra terminals that connect with the equipment’s body & the earth. It has terminals for both phases & neutral on both supply & load sides. The voltage difference is used to detect the leakage current & instantly break the circuit. Voltage ELCB operates on the voltage level between the earth & the body of the equipment. 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. ![]()
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