# 3 Pole – 4 Pole MCCB Wiring Diagrams and Installation

As you know that there are different types of circuit breakers, those circuit breakers well-known name is MCCB which moulded case circuit breaker and in this post, you will learn about the MCCB wiring and installation. in this post, I am going to share with you two diagrams of MCCB, one is about the wiring of 3 pole MCCB circuit breaker and the other one is about 4 pole circuit breaker.

By using the three-pole circuit breaker we can control the three-phase power system and by using the four pole we can control 3 phase 4 wiring system. However, I also share diagrams about the wiring and installation of MCB (miniature CB) and you can also read about those diagrams and post by using the following links.

How to wire 4 pole mcb
how to wire 3 pole mcb
how to wire a distribution board
How to install MCB breakers in-home wiring

## How to wire Three Pole and 4 Pole MCCB circuit breakers

The wiring of the MCCB and MCB circuit breaker is the same, and it’s too simple but the difference between MCB (miniature CB) and MCCB is that we can use MCB the load between 0.5 to 100 amps and range of ampere of MCCB is 1000 amps.
So if are doing a connection for the distribution board in which ampere ratings are over then 100 amperes then we can not use the MCB and we must install the MCCB.
The three-pole type of moulded case circuit breaker is used mostly for controlling the three-phase system and this is also designed for that work. However, we can use it for any work regarding work. If our single phase load is over 100 ampere then we can also use this circuit breaker.
In the below MCCB wiring diagram, I show the complete method of wiring and installation of three pole-moulded case circuit breaker.

When we have to control a 3 phase circuit by using a breaker the first option is to choose a three-pole but if the circuit is three phases 4-wire system then this work can not be done without a 4 pole circuit breaker. In the below 4 pole MCCB control wiring diagram I show the complete method of installation and wiring of 4 poles moulded case CB.

One thing more that if you are going to wire a multi-storey building and instillation three phase 4 wire system then use MCCB in your main distribution board but chose your breaker regarding your total load. However further soon I will publish a post about wiring installation in multi-storey building diagrams and a guide in which I will also do the MCCB wiring connection.

### 4 thoughts on “3 Pole – 4 Pole MCCB Wiring Diagrams and Installation”

• May 25, 2017 at 4:25 pm

We help solving common electrical issues, including overheating of plugs. We also help in installation and maintenance of electrical appliances. Don’t forget to like our page, if you want to know more about us.

• November 4, 2019 at 11:09 pm

for 3 pole CB in vertical position with on/off Handle…. top L1,2,3 is shown as incoming power
which is line side. I have a clear momory how to wire in old day… because on/off handle upper positon is on , so incoming live power wire should connect to bottom L1,2,3 and Load wire to the top L1,2,3. what happened is this wrong now.
For power Panel board, you should wire like your picture. but incoming power live wire to
any power circuit breaker, Line side live wire to the bottom L1,2,3,
Am I wrong ? can anyone answer my question / this was done because of safety in my knowledge.
The top L1,2,3 shoild have voltages when close CB by close handle upward.

• March 31, 2022 at 5:04 am

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