Principle of AC contactor km in power supply circuit

AC contactor is a kind of conducting power switch used in AC natural environment, which is more commonly used in various operating routes at present. It has the characteristics of under voltage maintenance, zero voltage release maintenance, reliable operation, stable characteristics, high actual operation frequency, convenient maintenance and so on.

In the specific application, the key of AC contactor is to connect the power switch in the power circuit of AC power supply system to complete the long-distance access and power off

When the electromagnetic induction coil of AC contactor is connected with the power supply, the electromagnetic field is caused by the current passing through the coil, which makes the static iron core generate sufficient suction. It gets rid of the recoil force of the reaction force springing yellow and the working pressure spring plate of the moving contact, and draws the moving iron core. In addition, it pushes the transmission system rod to change the situation of the moving contact Kuqa contact, in which the three pairs of open and close main contact are closed, Two pairs of open and close auxiliary contacts on both sides of the main contact are closed, and two pairs of normally closed auxiliary contacts are broken. When the power of the electromagnetic induction coil is turned off, because the electromagnetic induction suction of the iron core subsides, the moving iron core is released under the action of the yellow spring force of the reaction force, and each contact also changes with the initial condition of the repair. When the coil voltage of AC contactor is working at 80% ~ 105% rated voltage, it can ensure that everything is pulled in and released normally. When the voltage is too high, the equivalent circuit tends to saturation state, the coil current will expand, and the coil will be damaged when it is more serious. When the voltage is too low, the electromagnetic induction force is not enough, the moving iron core can not be pulled in or pulled out, and the coil current will expand, which will cause the coil overheating and damage.