Switch Ways and Poles
Switch Ways and Poles Diagram
Sometimes this is written in a kind of shorthand. Here's an example of the four types you're most likely to meet.
|SPST||Single Pole, Single Throw|
|SPDT||Single Pole, Double Throw|
|DPST||Double Pole, Single Throw|
|DPDT||Double Pole, Double Throw|
These are the only widely used shorthand abbreviations, as these are the most widely used switches.
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