Every air circuit breaker is fitted with a chamber surrounding the contact. Operation of ACB: The first objective is usually achieved by forcing the arc into contact with as large an area as possible of insulating material. 1) Plain air circuit breaker 2) Air blast Circuit Breaker. Types of ACB: There are mainly two types of ACB are available. Splitting up the arc into a number of series arcs also increases the arc voltage. As the length of arc path is increased, the resistance of the path is increased, and hence to maintain the same arc current more voltage is required to be applied across the arc path. It may increase the arc voltage by lengthening the arc path. As the temperature of arc plasma is decreased, the mobility of the particle in arc plasma is reduced hence more voltage gradient is required to maintain the arc. This circuit breaker increases the arc voltage by mainly three different ways, It may increase the arc voltage by cooling the arc plasma. Arc voltage is defined as the minimum voltage required maintaining the arc. For interrupting arc it creates an arc voltage in excess of the supply voltage. The air circuit breaker does the same but in different manner. The main aim of all kind of circuit breaker is to prevent the reestablishment of arcing after current zero by creating a situation where in the contact gap will withstand the system recovery voltage. Working principle of Air Circuit Breaker: The working principle of this breaker is rather different from those in any other types of circuit breakers.
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