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What does NOPN stand for?

NOPN stands for Normally Open

This definition appears rarely

Other Resources:
We have 1 other meaning of NOPN in our Acronym Attic

Samples in periodicals archive:

Mounted using a clip-in fixed mounting, the switch is available with either two normally open and two normally closed contacts with an optional auxiliary set of contacts, or four normally open or normally closed contacts with optional auxiliaries.
The switch is available with either two normally open and two normally closed contacts with an optional auxiliary set of contacts, or four normally open or normally closed contacts with optional auxiliaries.
Visitors will have free access to properties in St Helens which are either not normally open or would charge an entrance fee.
It gives people a chance to visit some beautiful gardens which are not normally open to the public.