Difference between MCB & Isolator

MCB:

MCB is Miniature circuit breaker,which used to  protect the electrical equipment from over load and short circuit conditions.

There are 5 type of MCB in the market based on the magnetic trip current,

1.Type B

2.Type C 

3.Type D 

4.Type K 

5.Type Z 

Based on the applications and demand, we are using the MCB's in domestic & industrial area.

There are two trip unit available in MCB, there are thermal trip unit and magnetic trip unit.

When over current is drawn by the electrical equipment, thermal trip unit trip the MCB,whereas magnetic trip unit will trip the MCB when the short circuit occurs .

Isolator :

Isolator used to isolate the electrical equipment from power supply or electric current for servicing and maintaining the equipments.

There is no protection system available

If over load occurs, the isolator will burns out.

Difference between MCB and Isolator:

        MCB                                   Isolator 

1. Automatice device        1.Manually operated 2.Protection available      2.Not available 

3.High Cost                           3.Low cost

4.Electronic circuit            4.Mechancial device 

made by transistors             act as switch

5.Arc suppression              5. Not available 

mechanism available 

6.High current                    6. Low current 

withstand                                  withstand 

capacity                                     capacity 

7.ON load device                  7.OFF load device

Please comment if you may have any doubts.