Contactor working principle is: after when the contactor coil, coil generates a magnetic field,
The magnetic field produced by static iron core produces a steady magnetic force attracts the iron core, as well as leading AC contactor action, normally closed contacts disconnect, normally open contact is closed, the two are linked. When the coil power, the magnetic force disappeared, armature is released under the action of the spring release, making contacts recovery, normally open disconnect, normally closed contacts are closed. DC contactors with temperature switch works the principle is similar to
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