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a mechanism which makes and breaks a contact through a toggle link mechanism having a spring which can store tripping force,.When the thermal element gets too warm, from an overcurrent situation, the spring trips, which in turn will shut off the electrical circuit. Construction-of-Molded-Case-Circuit-Breaker-MCCB Inside the plastic shell is a series of thermal elements and a spring-loaded trigger. Generally constructed of two pieces of heavy-duty electrically insulated plastic, these two halves are riveted together to form the whole. MCCBs are manufactured such that end user will not have access to internal workings of the over-current protection device.

A magnetic element for short circuit release which has to operate faster.In many countries, only the more beneficial current operating-type is manufactured Construction of MCCBĪ Moulded case circuit breaker generally have There are two types of ELCB, a current-operated type, and a voltage-operated type. It is also referred to as a “ Ground-fault circuit-interrupter”. Unlike a fuse, an MCCB can be easily reset after a fault and offers improved operational safety and convenience without incurring the operating cost.ĮLCB ( Earth Leakage Circuit Breaker ) is a type of Moulded Case Circuit Breaker.ĮLCB is a molded case circuit breaker used in a low-voltage AC electrical circuit to provide electric shock protection and prevent fires from current leakages.ĮLCB is called a “Circuit-breaker incorporating residual current protection” (IEC60947-2) or a “Residual current operated circuit breaker” (IEC61009-1). MCCB is an alternative to a fuse since it does not require replacement once an overload is detected. Read: Miniature Circuit Breaker MCCB vs Fuse The term “molded case” simply refers to the construction of the circuit breaker and refers to the fact that the circuit breaker is an assembled unit in a supporting housing of insulating material. NEMA defines Molded Case Circuit Breaker as devices designed to open or close a circuit by nonautomatic means and to open the circuit automatically on a predetermined overcurrent without damage to itself when properly applied within its rating. The Molded Case Circuit Breaker is a specific type of circuit breaker.