Signals & Electrical
Changeover contact
One common contact switches between an NO and an NC contact.
IN ONE SENTENCE
It gives you both normally-open and normally-closed choices from one switching mechanism.
In normal English
Often labelled COM, NO and NC. When the switch changes state, COM disconnects from one contact and connects to the other.
Why would I use it?
Use it when you need flexibility in how a switch or relay is wired.
THINK OF IT LIKE…
A railway point choosing one of two tracks.
Related terms
NO/NC, SPDT, relay
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