1, contactor contacts are easy to stick. First of all, it is necessary to check whether the load has exceeded the capacity of the contactor, and then use the circuit to protect the contacts when it is determined that the capacity of the contactor is indeed greater than the load power.

2. Contact damage is mainly caused by arc ablation. In order to reduce the generation of arc, varistor elements can be connected in parallel at both ends of the contact, which can significantly reduce the generation of arc and greatly improve the service life of the contactor.

Extended data

Contact system maintenance:

1. Check whether the positions of dynamic and static contacts are aligned and whether the three phases are closed at the same time. If there is any problem, adjust the contact spring;

2, check the contact wear degree, wear depth shall not exceed 65438±0mm, contact burning, desoldering, must be replaced in time; When slightly burned, it generally does not affect the use. Sandpaper is not allowed to be used when cleaning contacts, and plastic files should be used;

3. Measure the interphase insulation resistance, and the resistance shall not be less than10mΩ; ;

4, check whether the auxiliary contact action is flexible, contact stroke should comply with the specified value, check whether the contact is loose, found the problem, should be repaired or replaced in time.

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