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Thursday, 31 March 2016

What is the full meaning of spst

What is the full meaning of SPST


SPST 

        Single Pole Single Throw. These have two terminals which can be connected or disconnected. Including two for the coil, such a relay has four terminals in total. It is ambiguous whether the pole is normally open or normally closed. The terminology "SPNO" and "SPNC" is sometimes used to resolve the ambiguity.

single pole single throw symbol

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