Electrical / Electronic Switches Abbreviation and Symbols

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Electrical / Electronic Switches Abbreviation and Symbols

The following chart provides several common electro-mechanical switch drawing symbols and abbreviations. The switch illustrations may be used on mechanically actuated switches, membrane switches, or circuit mounted switches.

Abbreviation Nomenclature Description Switch Symbol
SPST Single pole, single throw Two terminals connected together or not connected.
SPDT Single pole, double throw A simple change form switch: Common is connected either to L1 or to L2.
SPCO Single pole changeover
or Single pole, centre off
Identical to SPDT. Suppliers may use SPCO for switches which are stable in off position while position the center and SPDT for those which do not.
DPST Double pole, single throw Identical to two SPST switches mechanical connected.
DPDT Double pole, double throw Identical to two SPDT switches mechanically connected.
DPCO Double pole changeover
or Double pole, centre off
Identical to two DPDT. Suppliers may use DPCO for switches which are stable in off position while position in the center.

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