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Old 06-28-2007, 03:28 PM
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NO is Normally Open
NC is Normally Closed
In a DPDT (Double Pole - Double Throw) switch or relay
double pole means two relay circuits, double throw means each relay circuit switches between two contacts, one contact is closed(NC) and the other is open(NO) when the relay is de-energized. Energize the relay and the closed contact will open and the open contact will close.
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