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Hi,

By using two windings instead of one. One is a low resistance winding that provide the strong pulling force and a second one (the hold winding) to supply the holding force. When first turned on, both winding provide the strong pulling force needed to actuate the solenoid. As the plunger reaches its final on position, the strong winding is switched off by a built in switch actuated by the plunger. This winding arrangement is used extensively in car starters.

René

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