Understanding MCCBs And MCBS With Exploration Of Moulded Case Circuit Breakers And Boards

Miniature Circuit Breakers (MCBS) and Moulded Case Circuit Breakers (MCCBs) work as an indispensable layer of protection for vital electrical systems. Every electrical professional or enthusiast must be conversant with these devices and their mechanisms. This article will focus on discussing the complexities of Legrand’s MCCBs and MCBS and their function in the distribution board while offering useful information to readers.

The Basics

MCCB is a strong and flexible moulded case circuit breaker used in commercial, industrial, and residential power supply situations. They defend against overloads and short circuits by interrupting the current flow. Besides, they offer the convenience of switching on/off operations by hand. 

However, MCBS are the smaller versions of MCCBs mainly used for the domestic electrical system. These machines protect one circuit or appliance without interfering with the entire network.

Functions And Features Of Legrand’s MCB & MCCB

  • The thermal-magnetic trip mechanism is one of the crucial features of the MCCB, as it has thermal overload and magnetic short-circuit protection. The moulded case circuit breaker, through this technology, reacts rapidly to abnormal conditions by cutting supplies within an instant, hence minimising the losses. 
  • On the other hand, mcbs mainly depend on thermal and electromagnetic tripping mechanisms as compared to the extensive customisation offered by MCCBs.

Distribution Boards

The Backbone Residential, commercial, and industrial setups have a distribution board as a central hub for electric flow. These are called the distribution boards, and they contain the MCCBs and MCBs so that the power gets effectively distributed and the circuits are protected.

Distribution boards are placed on walls for convenience so that it will not be difficult to reach circuit breakers. 

MCBS are the most common protective devices on these boards, while the MCCBs cater to high load demands and the main panels.

Benefits And Uses

There are a lot of benefits associated with the use of MCCB and MCBS. 

  • Firstly, they interrupt the power supply quickly during short circuits or overloads, thereby significantly reducing the risk of fires and electrical accidents. 
  • Also, their modular design makes them very easy to install, replace and upgrade. 
  • Moreover, they help reduce system unavailability through the rapid pinpointing of faulty circuits, ultimately improving system reliability. 
  • Also, owing to their flexibility and compatibility with diverse electrical systems used across several industries, such as manufacturing, healthcare, data centres, and residential houses, MCCBs and MCBS are widely applied.


Legrand’s MCCBs and MCBS are fundamental elements of electrical distribution panels that maintain safety, security, and optimal power supply. Therefore, it is significant to recognise and implement such devices in their proper sense, given that they have unique features, functionalities, and multiple applications. 

Electrical professionals will understand the ins and outs of MCCBs and MCBS when they grasp them. They will be able to design electricity systems that are reliable and safe. On the other hand, users will have peace of mind knowing that when there are changes in the electricity current, their safety.