Types of MCB | Types of MCB based on Tripping Characteristics in Kannada |

Types of MCB based on Tripping Characteristics
MCBs are classified into different types according to tripping over the range of fault current. The important MCB types are as follows:
Type B MCB
Type C MCB
Type D MCB
Type K MCB
Type Z MCB
Tripping Mechanism in Miniature Circuit Breaker
As explained in the above section, an MCB has two types of tripping mechanism.
Thermal Tripping
Magnetic Tripping
These are explained in the next section.
1. Thermal Trip Unit
The thermal trip unit protects against overload currents.
The thermal unit is based on a bimetal element located behind the circuit breaker trip bar and is part of the breaker’s current-carrying path.
When there is an overload, the increased current flow heats the bimetal causing it to bend. As the bimetal bends it pulls the trip bar which opens the breaker’s contacts.
The time required for the bimetal to bend and trip the breaker varies inversely with the current.
Magnetic and Thermal Trip Unit of MCB
Magnetic and Thermal Trip Unit of MCB
2. Magnetic Trip Unit
The magnetic trip unit protects against a short circuit. The magnetic trip unit is comprised of an electromagnet and an armature.
When there is a short circuit, a high magnitude of current passes through the coils creating a magnetic field that attracts the movable armature towards the fixed armature.
The hammer trip is pushed against the movable contact and the contacts are opened.
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