When the thermal element gets too warm, from an overcurrent situation, the spring trips, which in turn will shut off the electrical circuit.
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 former is specially designed for motor protection, for example, asynchronous or Induction motors.The Molded Case Circuit Breaker is a specific type of circuit breaker. MPCB can protect motors against overload, short circuits, phase loss and under-voltage faults. However application of Motor Protection Circuit Breaker is entirely different from that of Moulded Case Circuit Breaker. MPCBs and MCCBs are used to protect against overload and short circuits. Moulded Case Circuit Breaker and Motor Protection Circuit Breaker are used to open and close a circuit manually and interrupt the circuit automatically on the occurrence of faults. What is the difference between MCCB and MPCB? The former protect against overload and short circuit, the later protects against Residual currents and electric shock.Ĥ. MCCB and RCCB are circuit protection devices with two different applications. What is the difference between MCCB and RCCB? Current rated capacity of MCB is commonly under 125A, and MCCB is available up to the rating of2500A.ģ. There are few differences between these two devices besides current rated capacity. These devices provide protection against over current and short circuits. MCB and MCCB are commonly used circuit protection devices. What is the difference between MCB and MCCB? The thermomagnetic trip units use the bimetallic strip for current sensing and operation and microprocessor-based units consist of built-in CTs for current.Ģ. MCCB is equipped with trip units to sense and interrupt the current flowing through it. Some of these breakers also have an inbuilt ground fault and residual current protection features. Also, the continuous current rating of the same can be adjusted as per requirement. But Moulded Case Circuit Breakers can withstand more short circuit current more than miniature circuit breakers. Moulded Case Circuit Breakers name MCCB, it is also overload and short circuit protection devices, Similar to Miniature Circuit Breakers.