The trip mechanism of the switch is a set of linkage devices. When the main contact is closed by the operating mechanism, it is locked by the lock hook in the closed position.
If a fault occurs in the circuit, the relevant trip unit will act to disengage the lock hook in the trip mechanism, so that the main contact is quickly broken by the release spring. According to different maintenance functions, the trip unit can be divided into an overcurrent release and a voltage loss release.
There are three types of tripping methods: thermal, electromagnetic and double tripping. When the line is generally overloaded, the overload current can not make the electromagnetic tripper act, but can cause a certain amount of heat to the hot element air switch, causing the bimetal to be bent upwards by heating, pushing the lever to disengage the hook from the lock, The main contacts are disconnected and the power is turned off. When the line is short-circuited or severely overloaded, the short-circuit current exceeds the instantaneous tripping setting current value, and the electromagnetic tripper generates a sufficient suction force to suck the armature and the impact lever, so that the hook rotates around the rotating shaft seat and disengages the lock. The lock buckles the three main contacts under the action of the reaction force spring to cut off the power.
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