MCB Type and Classification

Admin@AKR Technical
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 MCBs are classified into different types according to the tripping above the limit of the fault current. The following are the types of important MCBs.

MCB Types

MCB classification is currently six different types. MCBs are used for different types of loads. MCB is classified into type A, B, C, D, K and Z based on the tripping current and tripping time.

Read more; Three phase MCB / Breaker current calculation 

MCB Type and Classification

MCB Type A 

Type A deviates from the MCB circuit when it exceeds 2-3 times the actual current rating. Because they are very sensitive to these types of short circuits, they are more suitable for semiconductor devices. 

MCB Type B

Type B, used to protect the cable by tripping the circuit when the current flows 3-5 times from the original current. MCB Type B is best suited for home appliances.


MCB Type C

Type C is used for average current load. Type B and C are the most commonly used in DBs. Tripping of MCB Type C is 5-10 times higher than normal. 


MCB Type D

Type D MCBs have a high tripping capacity as they can withstand 10-20 times the current rate. If you are looking for a circuit breaker for a device such as a motor with a high starting load, the Type D is the most suitable choice. 


MCB Type K

K type MCBs can be used for large load devices as they can withstand current up to 8-12 times the actual ampere for a specified period of time. 


MCB Type Z

Finally, the tripping current for Z type MCBs is 2 to 3 times the full load current capacity. K and Z type MCBs have a very short operating time for tripping (<0.1 Sec) so they are used for very sensitive devices.

Read more; Cable selection and it capacity

Classification of MCB

MCBs are classified into different types according to the tripping when the flow of current exceeds the limit. The important MCB types and their tripping times can be seen at a glance from the chart below.

MCB Type MCB Tripping Current Operating Time
Type A 2 To 3 times of the full load current <0.4 Sec
Type B 3 To 5 times of the full load current 0.04 To 13 Sec
Type C 5 To 10 times of the full load current 0.04 To 5 Sec
Type D 10 To 20 times of the full load current 0.04 To 3 Sec
Type K 8 To 12 times of the full load current <0.1 Sec
Type Z 2 To 3 times of the full load current <0.1 Sec

The trip time for Type A, K and Z MCBs is much shorter than for Type B, C and D MCBs. Class A, K, and Z are highly sensitive breakers that are used to protect sensitive equipment. These protect the equipment from damage as it works very fast in a very short time.

Conclusion

I hope you learned from this article what are the MCB type, selection and classification. Thanks for reading this article to understand the types and uses of MCBs.


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