I guess everyone has heard of air circuit breaker. So, why is the air circuit breaker called an air circuit breaker? What does it have to do with air? To understand this problem, you must first understand the classification of air circuit breakers and their working principles.
Circuit breakers can be divided into high-voltage circuit breakers and low-voltage circuit breakers according to the scope of their use, that is, the location of installation. The air circuit breaker used in our homes is another type of low-voltage circuit breaker. If we divide it according to the arc extinguishing method of the switch, then the circuit breaker can be divided into more oil circuit breakers, less oil circuit breakers, sulfur hexafluoride circuit breakers, vacuum circuit breakers, compressed air circuit breakers, air circuit breakers, SF6 combination electrical appliances.
Air circuit breakers are used in our homes. As long as the current in the circuit exceeds the rated current of the air circuit breaker, the air circuit breaker will automatically open and then cut off the power supply. This can effectively prevent the circuit from burning due to excessive current. When the air circuit breaker automatically turns off the switch, an arc will be generated at this time, and the air circuit breaker uses air as the arc extinguishing medium to automatically cut off the circuit. Therefore, air circuit breakers are mainly named according to their arc extinguishing method. The arc extinguishing medium of air circuit breakers is air.
Arc extinguishing principle of air circuit breaker
As mentioned above, the arc extinguishing medium of air circuit breaker is air, so how does it use air to extinguish arc? Air circuit breaker arc extinguishing is a very complicated process.
Due to some reason, the air circuit breaker trips. At the moment when the air circuit breaker trips, the contacts of the air circuit breaker will separate, and an arc will occur between the separated contacts. At this time, the arc current The direction of the magnetic field generated is opposite to the magnetic field induced by the arc extinguishing grid of the air circuit breaker and can attract each other. As a result, the arc will be pulled toward the arc-extinguishing grid by the attractive force, so that the arc will be elongated until it enters the arc-extinguishing grid, where it can be rapidly cooled and extinguished. This is such a process that the generated arc is extinguished. Lose.
In fact, it boils down to one point: it is called an air circuit breaker because it uses air as the arc extinguishing medium.
