How many types of MCB are there?

MCB is classified according to the tripping over the rage of fault current. It is most important for you to know what type of MCB trip curve to decide what type to use for different appliances for the correct electrical system. Before learning about type first understand the trip curve. Trip curve is essentially nothing but the maximum current that particular MCB can withstand. Here there are six different types of MCB, which are A, B, C, D, K, and Z. Let us check detailed information one by one below.


Types of MCB: 


Type A trip:

These type of MCB are highly sensitive to short circuit and are used for the protection of semiconductor devices.  MCB with class A trip characteristics trip instantaneously when the current flowing through it reaches between 2 to 3 times the rated current. 

Type B trip:

This type of trip off when the current flow is 3-5 times the actual flow and These MCB finds a use for cable protection.

Type C trip:

Type is C trip is most suitable for domestic and residential application ad electromagnetic starting with a medium starting current. this type of trip is off when the current flowing through it reaches between 5 to 10 times the rated current. 

Type D trip:

Type D MCB has high resistance, MCB with high-class D trip instantaneously when the current flowing through it reaches between above the 10 to 20 times the rated current. It is most suitable for inductive and motor loads with high starting currents.

Type K trip:

This type of  MCB withstand up to 8 to 12 times the initial charge and thus can be used for bulky load devices. It is suitable for inductive and motor load with high inrush currents.

Type Z trip:

This type of MCB is most suitable for highly sensitive to short circuit and that is used for the protection of highly sensitive devices such as semiconductor devices. MCB with class Z trip, the current flow through it reaches between 2 to 3 times the rated current. 

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