What do the acronyms N/O , N/C and C/O mean ?

Issue:
What do the abbreviations NO, NC, and C/O mean?

Product Line:
Relays and Timers

Environment:
All Relays and Timers

Resolution:
These are typical European Union acronyms . N/O indicates a Normally Open ( N.O.) contact that is single throw . N/C indicates a Normally Closed ( N.C.) contact that is single throw . C/O indicates a Changeover contact ( often noted as a Form C contact ) that is double throw to open and closed positions .

Released for: Schneider Electric USA