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- Pole = A
movable arm in the switch.
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- Throw =
The number of contacts that are affected by a single movement of a pole.
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- SPST
(Single-pole, single-throw): Turns a single circuit on or off.
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- SPDT (Single-pole, double-throw): Controls the flow of current to two
different circuits. When one contact is open the other is closed and
vise versa.
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DPST
(Double-pole, single-throw): Allows simultaneous opening or closing
of two sets of contacts. Both contact arms are mechanically linked so
that they move with a single switch action.
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DPDT
(Double-pole, double-throw): Connects one set of contacts to either
of two other sets of contacts.
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