Normally closed relay applications.
Normally open relay vs normally closed.
Normally open vs normally closed electrical switch contacts.
Relays and contactors have two types of contacts each suited for different applications.
Think of your relay as if it were two ends of as wire.
Here are just a few systems that require normally closed relays.
In other words when voltage is applied to the relay contactor terminals this contact closes.
Normally open no contacts allow current when the relay or contactor is energized.
In these systems normally closed relays act as.
Normally closed nc contacts allow current through when the relay or contactor is not energized.
When it comes to electrical switches and contacts many people seem to be confused by the terms normally open no and normally closed nc the root of the problem seems to start with the fundamental concept of what it means to be open or closed this post attempts to clarify those concepts.
A normally closed relay is one that is a complete circuit and therefore allows voltage to pass through it until it gets a signal and then it opens the circuit.