NC

Definition	:	Normally Closed
Category	:	Academic & Science » Electronics
Country/Region	:	Worldwide
Popularity	:
Type	:	Initialism

What does NC mean?

Normally Closed (NC) and Normally Open (NO) describe the state, or position, of contacts in a spring-loaded switch (forces other than springs can be used, but spring-loaded switches are by far the most common). Switch contacts can be open or closed. Closed contacts can conduct current through the switch, while open contacts cannot conduct current. A spring-loaded switch uses spring force to hold the contacts in one position or the other. The switch can have multiple sets of contacts, so some contacts can be NC, while others are NO on the same switch.