Switch Definitions

NC Normally Closed ON
NO Normally Open OFF
( ) Momentary Action
SPDT Single Pole Double Throw 2 or 3 Positions
SPST Single Pole Single Throw 2 Positions
3PDT Three Pole Double Throw 2 or 3 Positions
4PDT Four Pole Double Throw 2 or 3 Positions
DPDT Double Pole Double Throw 2 or 3 Positions
DPST Double Pole Double Throw 2 Positions
NO/NC 3 Poles Wired either/or
Rotary Poles then Positions