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single pole single throw (SPST)

A circuit breaker is a switch that establishes or releases an electrical connection via its switching contact. Depending on the design, a distinction is made between on-off switches with one switching contact, referred to as a single-pole on-off switch, or with two switching contacts, referred to as a double-pole on-off switch.

The Anglo-Saxon acronyms for these two designs are Single Pole Single Throw (SPST) and Double Pole Single Throw (DPST) and thus indicate the number of contact paths.

Switch designs Circuit

Switch designs Circuit

breakers are available in single pole and double pole designs. Whereas in the single-pole version one switching contact can open or close a connection, in the double-pole version, DPST, there are two switching contacts that are mechanically connected to each other. With such a DPST switch, two connections are always switched or released simultaneously. On-off switches are available with mechanical tripping, electromechanical and as electronic on-off switches.

Informationen zum Artikel
Englisch: single pole single throw - SPST
Updated at: 02.10.2008
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