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Old 12-14-2011, 08:17 PM   #5313 (permalink)
harlequin2
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You should DEFINITELY put a diode across the contactor coil. Cathode to +, anode to - and it needs a PIV rating of a couple or more times the supply voltage with a current rating equal to the coil current. If you don't fit a diode, the inductive spike generated when you open the contactor will destroy most things.
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