Push button (NC) symbol
Also called Normally closed push button, Stop button
A momentary switch that opens while it is pressed. Normally closed: the circuit is made until pushed.
What the push button (NC) symbol means
A momentary switch that opens while it is pressed. Normally closed: the circuit is made until pushed.
ANSI and IEC symbols
Where you see it
Stop buttons in motor control circuits, so a broken wire stops the motor instead of letting it run.
What is written next to it
On a schematic, the push button (NC) usually carries its designator, such as PB2 STOP or S0, and the button colour.
Related symbols
Frequently asked questions
What does the push button (NC) symbol look like?
On ANSI drawings: Two terminals with a bridging bar below them, touching, and a plunger. In IEC 60617: A break contact with a dashed link to the push-button operator.
Is the push button (NC) symbol the same in IEC and ANSI?
No. A break contact with a dashed link to the push-button operator.
Where is a push button (NC) used?
Stop buttons in motor control circuits, so a broken wire stops the motor instead of letting it run.
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