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Switch Circuit

This is the path that the electricy travels. The number of poles is determined by the number of contacts. The number of throws indicates how many positions that are used to direct the current. Here are some examples of the most common styles:

SPST - 2 terminals (Single Pole Single Throw)
SPDT - 3 terminals (Single Pole Double Throw)
DPST - 4 terminals (Double Pole Single Throw)
DPDT - 6 terminals (Double Pole Double Throw)
Other examples:
SP5T - 6 terminals (Single Pole Five Throw)
3PST - 6 terminals (Three Pole Single Throw)
3PDT - 9 terminals (Three Pole Double Throw)

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