What is MCB?

The full name of MCB (miniature circuit breaker) is miniature circuit breaker. Which provides protection to our current-powered equipment. Whenever there is more ampere or voltage supply in our line, then the MCB trips and breaks the current flowing in the line. Due to which our equipment is saved from damage. 

For example : 

     Suppose our fan runs on 4 amps 220 volts. And we have put a 6 ampere MCB in it. So if ever there is a sudden current flow of more than 6 amps in that line, the MCB in the case will trip within a few seconds, breaking the supply. Due to which our equipment will be saved from damage. 

In earlier times, fuse was mostly used instead of MCB. Fuse also works with this parker. Whenever there is an over voltage in the line or a short circuit, the fuse blows, and prevents the supply from going forward, 

But fuse is still used in many places. Fuse does not provide us as much protection as MCB does, because unlike MCB, fuse does not have any specific tripping rating. 

How many Types of MCB?

There are also many types of MCBs, such as B type, C type, D type, K type and Z type. All these MCBs are designed for different equipment.  

The tripping timing of each MCB is different. How long any MCB will trip depends on the MCB. What is the tripping timing of that MCB. 

If you look at the MCB, then the type of MCB and the ampere rating are written on it.  

For example: 
If C 5 is written on an MCB, then it is MCB of "C" type and 5 is its ampere rating. Next we will know in detail about all types of MCB.  

B Type MCB
B Type MCB should always be installed where resistive load is to be run, like heater, press, geyser etc. 

The tripping current of MCB is 3 to 5 times. This means that if the MCB has a rating of 10 amps written on it, then if there is a sudden flow of current between 30 and 50 amps, it will trip and break that line. Its tripping timing is between 0.04 to 13 seconds. 

C Type MCB

C Type MCB is to be installed where inductive load is to be run, like fan, motor, AC etc. The tripping current of MCB is 5 to 10 times more. And its tripping timing is between 0.04 to 5 seconds. 

D Type MCB

D Type MCB is a special type of MCB. It is installed where welding machines and X-ray machines are to be operated. The tripping current rate of this MCB is 10 to 20 times more. Means if suddenly current flows between 100 to 200 amperes, then it gets tripped in 3 seconds from O.o4 considering it as short circuit. 

K Type MCB

K Type MCB is a very sensitive type of MCB, this MCB is used where there is a high surge current of a large motor. The tripping current of this MCB is 8 to 12 times more. This means that if 10 amperes is written on the MCB, then it will break the current coming from 80 to 120 amperes. 

Z Type MCB

 Z Type MCB should be installed where the Electronic Load or Semi-conductor circuit has to be supplied. The tripping current of this MCB is 2 to 3 times. If 20 to 30 ampere current comes in its line then it will trip. 

Which MCB should be installed in the house?

You must have got complete information about MCB. But still if there is any question in your mind that which MCB to install in your house. So let me tell you that generally there is inductive load and resistive load in homes. So in this way we can use MCB Type C and Type D in resistive load and inductive load. 

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