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Low-voltage circuit breaker model selection

By:Nader Updated:September 09,2020 11:21AM

The air switch is a switch that trips as long as there is a short circuit, the switch forms a loop.

When the line is short-circuited or severely overloaded, the short-circuit current exceeds the instantaneous tripping setting current value, and the electromagnetic tripping device generates enough suction force to attract the armature and hit the lever, so that the hook rotates upwards around the shaft seat and the lock is released , The lock breaks the three main contacts under the action of the reaction spring to cut off the power supply.

When a general overload occurs in the circuit, although the overload current cannot make the electromagnetic release actuate, it can cause the thermal element to generate a certain amount of heat, prompting the bimetallic sheet to be heated upwards, pushing the lever to disengage the hook and the lock, and then the main contact The head is disconnected and the power supply is cut off.

Circuit breaker: It has the function of over-current and short-circuit automatic tripping, with demagnetization and arc extinguishing device, which can be used to connect and cut off large current;

Air switch: A type of circuit breaker. Its arc extinguishing device is exposed to the air and can eliminate the arc in an air medium environment. This type of electrical appliance is generally used in low-voltage circuits.

Consider the number of poles and rated current when selecting the model (it can be 1.5-2.5 times the rated current of the load)