Types of Circuit Breakers: How to Classify Circuit Breaker?

Circuit Breakers are mechanical switching devices that can make, break or carry a circuit either manually or automatically under normal and abnormal conditions. 


The Circuit Breaker is described in short as CB; The characteristics of a Circuit Breaker are as follows:

A Circuit Breaker can make or break ae electrical circuit under normal operating conditions either manually or using a remote control.

Under abnormal or fault conditions, a Circuit Breaker can break the circuit automatically.

The Circuit Breaker can make the circuit under fault conditions either manually or using a remote control.

Under normal conditions, a circuit breaker can make, carry or break currents and under abnormal conditions, it can make or carry for a specific time and break the currents.

Common Types of Circuit Breakers

A Circuit Breaker contains two elements - 
  • a thermal part which reacts to moderate overloads;
  • a magnetic part which reacts to short circuits.

Basic types of the circuit breaker or MCB or Miniature Circuit Breaker you may find as below:

Type B
Trips between 3x and 5x the rated current.
Example - a 10A circuit breaker would need between 30A and 50A before it trips.

Type C
Trips between 5x and 10x the rated current. Example - a 10A circuit breaker would need between 50A and 100A before it trips.

Type D
Trips between 10x and 20x the rated current. Example - a 10A circuit breaker would need between 100A and 200A before it trips.

Type K
Less common, this type of trips between 10x and 14x the rated current. This is within the trip range of the D type.

Type Z
Another uncommon option, type Z trips between 2x and 3x rated current. This puts it below the trip range of type B.

ABB, MCB (Miniature Circuit Breaker) Types and section condition:


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