When the circuit of the miniature circuit breaker is generally overloaded, the overload current cannot activate the electromagnetic release.
When the circuit of the miniature circuit breaker is generally overloaded, the overload current cannot activate the electromagnetic release, but it can generate a certain amount of heat for the heating element, causing the bimetal to be bent upward by the heat, and pushing the lever to disengage the hook from the lock. , break the main contact, cut off the power
The main contact is closed by the operating mechanism (manual or electric), and its contact system can not only turn on or off the normal working current due to the arc extinguishing device but also quickly cut off the normal operating current in the event of a fault. Several times the fault current, which can effectively protect the electrical equipment in the circuit
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 the different protection effects, the trip unit can be divided into an overcurrent release and a voltage loss release.
Under normal conditions, the armature of the overcurrent release is released; in the event of a severe overload or short circuit fault, the coil in series with the main circuit will generate a strong electromagnetic attraction to attract the street iron and open the hook. , the main contact is disconnected. The operation of the Undervoltage release is exactly the opposite. When the voltage is normal, the electromagnetic attraction attracts the armature and the main contact is closed. Once the voltage is severely dropped or powered down, the armature is released and the main contact is opened. When the power supply voltage returns to normal, it must be re-closed before it can work, achieving voltage loss protection.
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