The air circuit breaker is a switch that will trip as long as there is a short circuit. When the line is short-circuited or heavily overloaded, the short-circuit current exceeds the instantaneous trip current setting and the electromagnetic release generates sufficient suction to attract the armature and strike the lever, causing the hook to rotate around the shaft seat and release the lock. When the release is tripped, the three main contacts are separated by the action of the return spring, thus interrupting the power supply.

When the line is generally overloaded, although the overload current cannot cause the electromagnetic release to operate, it can cause the heating element to generate a certain amount of heat, which causes the bimetallic plate to bend upwards when heated, pushing the lever to disengage the hook and the lock, and releasing the main contact The head is disconnected and the power is cut off. As there are many types of insulation, there are oil switches, vacuum switches and other inert gas (sulphur hexafluoride gas) switches. The air circuit breaker is a circuit breaker that uses air to quench the arc, hence the name air circuit breaker. Air is used to extinguish the arc generated during switching. That's why it's called an air switch.

Circuit breaker: It has the function of overcurrent and short circuit automatic tripping, and has a degaussing arc extinguishing device, which can be used to connect and disconnect large currents; air switch: a type of circuit breaker, its arc extinguishing device is exposed to air The arc can be extinguished in the air medium environment, and this type of electrical equipment is generally used in low voltage circuits.

1. The difference in voltage levels: In general, the applicable voltage level of air switches is below 500V, while circuit breakers can usually be applied to various voltage levels above 220V.

2. The breaking capacity is different: the load and short-circuit current that the general circuit-breaker can withstand is greater.

3. The difference between arc extinguishing medium and method: The arc extinguishing medium and method of circuit breakers include not only air circuit breakers, but also vacuum circuit breakers, multi-oil circuit breakers, less oil circuit breakers, sulphur hexafluoride circuit breakers, etc.

4. The difference between support equipment: Generally speaking, the measurement of circuit breaker, logic and supporting equipment of the execution part of the mechanism is more complicated than that of air circuit breaker.