MCB (Miniature Circuit Breaker) is a type of electrical protection device that is used to avoid fire hazards due to short circuits or excess electric current in electrical installations. MCB works by cutting off electricity when there is a short circuit or excess current in an electric circuit. This article will discuss in detail about the working system of the MCB.

Components Inside the MCB

MCB consists of main components such as bimetal, solenoid and trigger mechanism. Bimetal functions as a temperature sensor that can bend when there is an increase in temperature in the electrical circuit. The solenoid serves as the trigger for the electrical circuit and the trigger mechanism acts as the actuator of the solenoid.

When there is an increase in temperature in the electrical circuit, the bimetal in the MCB will bend because of the electrical conductivity properties which are affected by temperature. When the bimetal bends, the trigger mechanism will actuate the solenoid to break the electrical circuit. The solenoid will move up and pull the MCB head pin so that the electrical circuit is broken.

The MCB also has a manual reset mechanism that can be used to turn the power back on after the power circuit has been cut. The manual reset mechanism on the MCB works by inserting the MCB head pin into its original position.

MCB Characteristics

The MCB has several types of electric circuit triggering characteristics, such as Characteristics B, C, and D. These characteristics indicate the sensitivity of the MCB to excess electric current in the electric circuit. Characteristic B is used for protection of electric circuits with light resistive and inductive loads, characteristic C is used for protection of electric circuits with moderate inductive loads, and characteristic D is used for electric circuits with heavy inductive loads such as electric machines.

In conclusion, the MCB is an electrical protection device that works by cutting off the flow of electricity when a short circuit or excess current occurs in an electric circuit. The MCB consists of a bimetal, a solenoid and a trigger mechanism which work together to break the electrical circuit. MCB has several types of electric circuit trigger characteristics that must be selected according to the needs of electric circuit protection.

Authorized Distributor of Electrical Equipment

PT. Mitra Cipta Hardi Elektrindo as the official distributor of Schneider Electric presents MCB, RCBO and ELCB products with the Domae brand as well as various other quality, official, original and guaranteed electrical equipment needs for your complete residential, retail and industrial needs with friendly and satisfying customer service, one stop solution.

Reference source:

Schneider Electric. (n.d.). What is a Miniature Circuit Breaker (MCB)? Retrieved from https://www.se.com/id/en/faqs/FA240872/ 

PT. Schneider Indonesia. (n.d.). Guide to Choosing the Type of MCB that Fits Your Needs. Taken from https://www.se.com/en/id/work/campaign/choose-your-miniature-circuit-breaker.jsp 

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