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on video How Does a Miniature Circuit Breaker (MCB) work?

 


Types of Miniature Circuit Breaker
MCB trip curve decides the type of MCB that must be used for different appliances or devices. There are 6 types of MCBs, they are:

A-Type
B-Type
C-Type
D-Type
K-Type
Z-Type
A Type MCB trips off the circuit when the current exceeds 2-3 times the actual current rating. A type MCB – Miniature Circuit Breaker is highly sensitive to the short circuit, and hence we can find its application in the manufacturing of semiconductors.

B Type MCB trips off the circuit when the current exceeds 3-5 times the current flow and finds its application in cable protection.

C Type MCB trips off the circuit when the current exceeds 5-10 times the actual current flow and finds its application in domestic as well as commercial appliances like transformers, fluorescent lighting circuits, and IT equipment like personal computers, servers, and printers.

D Type MCB trips off the circuit when the current exceeds 10-20 times the current flow and offers high resistance. It finds its application in motors.

K Type MCB can withstand up to 8-12 times the current flow and finds its application in heavy-duty load devices like compressors, winding motors, and X-ray machines.

Working Principle of MCB
The typical working real-time MCB is shown in the picture below.


 


Types of Miniature Circuit Breaker
MCB trip curve decides the type of MCB that must be used for different appliances or devices. There are 6 types of MCBs, they are:

A-Type
B-Type
C-Type
D-Type
K-Type
Z-Type
A Type MCB trips off the circuit when the current exceeds 2-3 times the actual current rating. A type MCB – Miniature Circuit Breaker is highly sensitive to the short circuit, and hence we can find its application in the manufacturing of semiconductors.

B Type MCB trips off the circuit when the current exceeds 3-5 times the current flow and finds its application in cable protection.

C Type MCB trips off the circuit when the current exceeds 5-10 times the actual current flow and finds its application in domestic as well as commercial appliances like transformers, fluorescent lighting circuits, and IT equipment like personal computers, servers, and printers.

D Type MCB trips off the circuit when the current exceeds 10-20 times the current flow and offers high resistance. It finds its application in motors.

K Type MCB can withstand up to 8-12 times the current flow and finds its application in heavy-duty load devices like compressors, winding motors, and X-ray machines.

Working Principle of MCB
The typical working real-time MCB is shown in the picture below.


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