What is the difference between a pick-up coil and a holding coil?
What will be an ideal response?
Contactors that are designed to control direct current devices are generally of the clapper type because those exhibit a greater air gap between the movable and stationary load contacts. Because of the distance the armature must travel, these contactors often contain two coils connected in parallel. One coil is called the pick-up coil and the other is called the holding coil. The pick-up coil is designed for momentary duty only and the holding coil is designed for continuous duty. When the contactor is energized, both coils operate to create a strong electromagnetic field. When the armature closes, the pick-up coil is disconnected and the armature is held in place by the holding coil.
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