SWITCH SPDT Centre Off 3 position Mini Changeover 5pk electronics EXPO A28011

Switch Reference Guide - SPST, SPDT, DPST, DPDT

SP and DP refer to single pole and double pole, ST and DT refer to single throw and Double throw. 

• SP: Single Pole, one circuit controlled by the switch.
• DP: Double Pole two independent circuits controlled by the switch which are mechanically linked.
  Note: “Pole” should not be confused with “Terminal”. The DPST switch, for example has four terminals however is a Double Pole  (DP) and not a four pole (4P) switch.
  
• ST: Single Throw, closes a circuit at only one position. The center position is off.
• DT: Double Throw, closes a circuit in the up or down position (On-On). A Double Throw switch can also have a center position  such as On-Off-On.
• SPST - On-Off
• DPST - On-Off  - Both load terminals can be energized at the same time. They are independent of each other and could be of  different voltages.
• SPDT - On-On  - Only one of the loads can be energized at a time
• DPDT - On-On  - Functions like two separate SPDT switches operated by the same actuator. Only two loads can be On at a  time.
• SPDT - On-Off-On  - Only one of the loads can be energized at a time.
• DPDT - On-Off-On  - Functions like two separate SPDT switches operated by the same actuator. Only two loads can be On at a  time

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