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The relay are switching devices activated by signals.

Normally open relay contact symbol. Of these contact forms the following are particularly common. Form a contacts make contacts are normally open contacts. Normally closed nc contacts allow current through when the relay or contactor is not energized. The contacts open when the relay activates to break the circuit.

Now let s go through a real world example of normally open and normally closed contacts that we are all familiar with. Relays and contactors have two types of contacts each suited for different applications. Changeover contact this is the changeover contact of a relay that is closed or connected with one terminal known as normally closed terminal when the relay is deactivated the other terminal. It is the contact of relay that is in closed position when there is no power supplied.

Rarely are these familiar examples good for learning but a 3 way switch is an excellent example of using normally open and normally closed switches. In other words when voltage is applied to the relay contactor terminals this contact closes. The national association of relay manufacturers and its successor the relay and switch industry association define 23 distinct forms of electrical contact found in relays and switches. Time delay relay contacts must be specified not only as either normally open or normally closed but whether the delay operates in the direction of closing or in the direction of opening.

The following is a description of the four basic types of time delay relay contacts. Most of the time a small voltage or current is used to switch other voltages or higher currents that may be electromechanical or fully electronic type.

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