The Difference Between Moulded Case Circuit Breaker And Miniature Circuit Breaker

 The Difference Between Moulded Case Circuit Breaker And Miniature Circuit Breaker

Overload and short circuit protection in low-voltage power distribution systems and motor protection loops are provided by a moulded case circuit breaker (MCCB). Its dependability and stability have made it popular in manufacturing. 

As with other circuit breakers, the primary purpose of the miniature circuit breaker (mcb) is to safeguard the electrical terminals of a building’s power distribution system. 

Knowing the difference between a circuit breaker and a miniature circuit breaker (mccb) is crucial for selecting the appropriate device, as both are in the same family; the variations between them are outlined below.

  • Current Rating

Circuit breakers with moulded cases can handle currents of up to 2000A, and miniature circuit breakers are rated for currents up to 125A. 

Miniature circuit breakers are only suited for 10 square metres of wire. In contrast, the effective area of a moulded case circuit breaker is greater than that of a small break in this particular work because the access wire is relatively thick, reaching more than 35 square metres. 

Therefore, moulded case circuit breakers are preferable in most interior settings, especially bigger spaces.

  •  Installation

Moulded case circuit breakers are often screw mounted, have an easy-to-press reset button, are reliable in operation, and have good contact. 

In addition, the microcircuit breaker is typically mounted via the guide rail, where it might occasionally fail to make good contact due to a lack of torque. 

Moulded circuit breakers are more reliable and simpler to install than micro circuit breakers due to their unique design.

  •  Functioning And Living

Operationally. Overcurrent and short circuit protection are both included in moulded case circuit breakers, with the latter’s action value being easily adjustable for maximum speed and convenience. 

The issue cannot be resolved in many situations since miniature circuit breakers use the same components for overcurrent and short circuits, and the current cannot be altered. 

Since generating a phase short circuit with a plastic case circuit breaker is more difficult, its service life is longer than that of a micro circuit breaker. Other advantages include its capacity to withstand higher short-circuit currents and its resistance to arcing.

  • Usage Versatility

In this regard, moulded case circuit breakers are more common than small ones, offering greater installation versatility. MCCB provides separate protection against overcurrent and short circuits, with a flexible action value for overcurrent protection. 

Mcbs are unified devices that offer both over-current and short-circuit protection. However, they need to improve in terms of regulatory flexibility. The mcb may seem like it’s blowing in the wind, but you’ll either have to commit to one or wait a while.


When safeguarding electrical devices in the event of an electrical surge or other abnormality, MCB and MCCB are both excellent choices. However, as seen in the preceding table, there are numerous distinctions between MCB and MCCB. 

A main circuit breaker (MCB) is used in low-current circuits, whereas a main circuit breaker (MCCB) is utilised in high-current circuits. Some of the best options for helping households and factories avoid electrical mishaps are products made by Legrand.

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