An air break circuit breaker is a type of circuit breaker that uses air to extinguish the arc that forms when the contacts open. This type of circuit breaker is typically used in high-voltage applications, where the arc is more likely to be sustained.
Air break circuit breakers work by using a set of contacts that are separated by an air gap. When the contacts open, the air in the gap is ionized, creating an arc. The arc is then extinguished by the flow of air through the gap.
The amount of air that is required to extinguish the arc is determined by the voltage of the circuit. Higher voltages require more air to extinguish the arc.
Air break circuit breakers are typically used in applications where the voltage is above 600 volts. They are also used in applications where the current is high, such as in power distribution systems.
Air break circuit breakers are reliable and have a long service life. However, they are also more expensive than other types of circuit breakers, such as molded case circuit breakers.
Here is a diagram of an air break circuit breaker:
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