Q) What are the indicators of mechanical life of contactors?
Following are the indicators of the end of mechanical life.
1)For E shaped magnets, air gap between the central limbs is reduced to zero. This is indicated when there is rubbing of paint on the central pole face of the upper magnet.
2)Broken shading ring of magnet.
3)Flaring of magnet pole faces, hence difficulty in removing coil.
4)Incurable humming
5)Sluggish operation
6)Contactor does not drop off
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