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One moving blade between two fixed contacts.
Also known as: Change-over contact, SPDT contact, Form C contact, Blade between two contacts
A changeover contact connects a common terminal to one of two others and never to both — there is a brief moment during transfer when it touches neither. That break-before-make behaviour is what the symbol asserts, and a make-before-break version is drawn differently.
Denotes a contact set transferring a common terminal between a normally closed and a normally open contact.
Contexts: Electrical equipment
Is break-before-make by default: the moving contact leaves one fixed contact before reaching the other, so the circuit is momentarily open.
Contexts: Electrical equipment
Is called single-pole double-throw in switch terminology and Form C in relay terminology, for the same arrangement.
Contexts: Electrical equipment
A short angled line pivoting at one end, its free end resting against one of two short fixed strokes set above and below it.