When the contactor coil is energized, the coil current will generate a magnetic field, and the generated magnetic field will make the static iron core generate electromagnetic attraction to attract the moving iron core, which will drive the AC contactor to move, so that the normally closed contact will be disconnected and the normally open contact will be closed, which are linked. When the coil is powered off, the electromagnetic attraction disappears, and the armature trips under the action of the trip spring, so that the contacts are reset, the normally open contacts are disconnected, and the normally closed contacts are closed. The working principle of DC contactor is somewhat similar to that of temperature switch.
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Precautions:
Before installing the contactor, check the technical data on the product nameplate and coil (such as rated current, voltage, working frequency, power-on duration, etc.). ) meet the actual use requirements.
Manually opening and closing the movable parts of the contactor requires the product to move flexibly without jamming. Some contactors are coated with anti-rust oil on the pole surface of the iron core, so the anti-rust oil on the pole surface of the iron core should be wiped clean during use, so as to avoid oil dirt sticking and power failure of the contactor.
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