## Fault protection

A new terminology for electrical currents now include all faults those between live conductors as well as earth or grounding faults.

If we not design our circuit protection properly followed standard guide,it can cause serious injury or death for human and equipment damage.

Fault current be determined at every relevant point. For small and medium installations with LV utility supplies, this is satisfied by determination of the fault currents at the incoming power supply. read more

## Circuit breaker specific features for main switchboard

For circuit breakers specification MUST suitable with installation condition and needed.Main switchboard is the main power supply distribution for factory or building.This unit is a key for entire electrical power supply distribution.

Circuit breaker feed the high volume of voltage for all equipment and machine.It also have a high value of short circuit current due to proximity of low voltage supply and size busbar for conveying the high current.

So we need carefully and detail understanding about circuit breaker before choose the circuit breakers for main switchboard application.This time i want share some information about criteria and specification circuit breaker for main switchboard. read more

## Miniature Circuit Breaker Sizing

When we design or build a electrical installation,we must know how to choose the suitable circuit breaker for the any application that we design.For electrician,this is compulsory knowledge.So here i want share my little knowledge about circuit breaker sizing method.

This calculation for sizing the miniature circuit breaker.For other circuit breaker likes MCCB,ACB,VCB,OCB and etc,it have a additional factor and calculation that we must consider.

For that why i will discuss it in my next post…so this time i want explain the simple way how to sizing the miniature circuit breaker for our application. read more

## Molded Case Circuit Breaker

### What is MCCB ( Molded Case Circuit Breaker ) ?

It is a mechanical device ( BS 4752 ) to be used to connect and disconnect the circuit in normal and abnormal.Current rate for regular MCCB up to 3000 ampere.

It is only available in a 3 pole only, usually for a system that has a high ampere ratings in three ( 3 ) phase systems.For those who have ampere ratings than 400 ampere, the safety interlock system is prepared for security purposes because the current system are high.

There are two ( 2 ) types of MCCB commonly used in industry, it was: –