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A contact operated by a stem with a bar on top.
Also known as: Momentary switch symbol, Normally open contact, Normally closed contact
A push button is drawn as a contact worked by a stem capped with a bar. Whether it makes or breaks the circuit is shown by which side of the contact the stem sits, and that difference between a normally-open and a normally-closed button is the whole of what a control drawing depends on.
Denotes a momentary switch that returns to its rest position when released.
Contexts: Technical drawing, Electrical equipment
Is drawn in normally-open and normally-closed forms, the difference being whether the contact is shown touching at rest, which control circuits depend on.
Contexts: Technical drawing, Electrical equipment
A short vertical stem capped with a horizontal bar, meeting a contact drawn as a line touching or lifted from a terminal.