Normally Open Relay Switch

Normally closed nc contacts allow current through when the relay or contactor is not energized.

Normally open relay switch.

Spst no single pole single throw normally open relays have a single form a contact or make contact. When current is applied to its coil the generated magnetic field switches the armature and closes the contact so you can say that it turned on the. Nc is normally closed i e. Normally open no contacts allow current when the relay or contactor is energized.

Form a contacts make contacts are normally open contacts. 1no1nc is generally used to describe contactors industrial power relays and manual switches like emergency stop buttons. We can tell this switch is a normally open no switch because it is drawn in an open position. The contacts are normally closed and open when the switch is actuated.

Of these the following are commonly encountered. Now let s go through a real world example of normally open and normally closed contacts that we are all familiar with. The national association of relay manufacturers and its successor the relay and switch industry association define 23 distinct electrical contact forms found in relays and switches. Of these contact forms the following are particularly common.

No is normally open i e. Ehdis 2 pack car truck motor heavy duty heavy duty 5 pin 80a 12v on off normally open spdt relay socket plug 5 wire automotive 4 4 out of 5 stars 217 12 99 12. The contacts are normally open and close when the switch is actuated. 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. Relays and contactors have two types of contacts each suited for different applications.