Normally open contact symbol
Also called NO contact, Make contact, Relay contact NO
A contact that is open while the relay is de-energised and closes when the coil is energised.
What the normally open contact symbol means
A contact that is open while the relay is de-energised and closes when the coil is energised.
ANSI and IEC symbols
Two parallel lines, as on a ladder diagram. It looks like a capacitor, so read it in context.
ANSI SVGWhere you see it
Seal-in (holding) contacts, interlocks and outputs in control circuits.
What is written next to it
On a schematic, the normally open contact usually carries the designator of the coil that operates it, such as CR1, and often the terminal numbers (13-14).
Related symbols
Frequently asked questions
What does the normally open contact symbol look like?
On ANSI drawings: Two parallel lines, as on a ladder diagram. It looks like a capacitor, so read it in context. In IEC 60617: A hinged blade drawn open.
Is the normally open contact symbol the same in IEC and ANSI?
No. A hinged blade drawn open. The IEC 60617 number is S00227.
Where is a normally open contact used?
Seal-in (holding) contacts, interlocks and outputs in control circuits.
- In production since 2014
- Thousands of daily users
- On MODEC FPSO projects since 2016