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Will stray capacitance affect the life of the contacts?

The actual switching takes place during the first 50 nanoseconds. Any stray capacitance may be charged up to the load voltage or potentially common mode voltages at the time of switch closure.  In this case the contacts will switch that voltage with its associated current.  This can degrade the contacts very quickly causing them to stick. Adding  resistance in series with the reed switch will reduce the inrush current and prolong the life.

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