What magnetic force is required to close a reed switch ?

force MAGNETIC Reed Switch
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What magnetic force is required to close a reed switch ?

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Minimum force – expressed in ampere-turns, will cause the reeds to close, and is called the just-operate force. Since the force between the poles increases as the gap decreases, a force of approximately half the just-operate force will maintain the operated state. Speed of operation of the reed switch is determined by the excess of operating force over the just-operate force.

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