Push button (NO) symbol
Also called Normally open push button, Start button, Momentary switch
A momentary switch that closes only while it is pressed. Normally open: no contact until pushed.
What the push button (NO) symbol means
A momentary switch that closes only while it is pressed. Normally open: no contact until pushed.
ANSI and IEC symbols
Where you see it
Start buttons, reset buttons and momentary commands in motor control circuits.
What is written next to it
On a schematic, the push button (NO) usually carries its designator, such as PB1 START or S1, and the button colour.
Related symbols
Frequently asked questions
What does the push button (NO) symbol look like?
On ANSI drawings: Two terminals with a bridging bar above them, not touching, and a plunger. In IEC 60617: A make contact with a dashed link to the push-button operator.
Is the push button (NO) symbol the same in IEC and ANSI?
No. A make contact with a dashed link to the push-button operator.
Where is a push button (NO) used?
Start buttons, reset buttons and momentary commands in motor control circuits.
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