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 The toggle switch

 is a very basic device that illustrates its internal schematic and external features. Operating the lever/arm opens and closes switch contacts.

 

Operating levers on toggle switches are sometimes ganged so that more than one circuit is operated.

The simplest switch has two contact surfaces that provide a link between circuits; these links are referred to as poles.

 

 Switch contacts can be normally open or closed and this is normally marked on the switch (NO/NC). The number of circuits that can be linked by a single switch operation is called the throw. The simplest form of switch would be single-pole, single-throw (SPST). Schematics of switch configurations are commonly found in aircraft.

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