TAPCO Electrical Power Toggle Switches - Grainger Industrial Supply

Refers to the number and type of contacts a device has for controlling connections.

SPST this represents a single-pole, single-throw switch. They control one circuit and have contacts that are normally open (NO) or normally closed (NC).
SPDT this represents a single-pole, double-throw switch. They control one circuit and have changeover contacts.
SP3T this represents a single-pole, triple-throw switch. They control one circuit and have contacts that are normally open (NO) or normally closed (NC).
DPST this represents a double-pole, single-throw switch. They control one circuit and have contacts that are normally open (NO) or normally closed (NC).
DPDT this represents a double-pole, double-throw switch. They control two circuits and have changeover contacts.
3PST this represents a three-pole, single-throw switch. They control one circuit and have contacts that are normally open (NO) or normally closed (NC).
3PDT this represents a three-pole, double-throw switch. They control two circuits and have changeover contacts.
4PST this represents a four-pole, single-throw switch. They control one circuit and have contacts that are normally open (NO) or normally closed (NC).
4PDT this represents a four-pole, double-throw switch. They control two circuits and have changeover contacts.

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