Classification of MCB

MCB classification 

By color                                         By Pole

1 Black MCB used in -  DC circuits  - Single pole

2 Blue  MCB used in -  Light circuits - Double Pole

3 Brown MCB used in - Power circuit - Triple  Pole

4 Red  MCB used in -  As isolator - Triple Pole neutral 

By Speed                   Used in 

1 Type  B - 3 to 5 times -  Generator 

2 Type C - 5 to 10 times- Residential 

3 Type D - 10 to 15 times - Motors 

Meaning of Rating in MCB 

1 B10

2 C25

3 D2

Select the MCB 

Select the MCB if current rating is 20A.

B20

C20

C25

B25

D20