Relays: Single Throw vs Double Throw

Relays: https://www.rspsupply.com/c-1620-relays.aspx

Today we want to talk in a little more about relays. Specifically, about NO contacts and NC contacts. Why does it matter and how does it affect the type of relay we might need.

* All relays have a set of contacts, these contacts allow electricity to pass through them when they are in the closed position (or when they are touching each other)

* Depending on the function we need in a relay, we can use a NO contact or a normally closed contact.

o Normally Open Contacts

* The contacts will not be touching each other in it’s normal state (that is when the coil is not acting on the contact)

* When the coil is energized, the normally open contact will be pulled against the other stationary contact into a closed state

* At this point, electricity will be able to pass through the contacts.

* A relay that is normally open is providing power when the coil is energized.

* Lets look at how this works

o Normally closed contacts

* The contacts WILL be touching each other in the relay’s normal state (when the coil is not acting on the contacts)

* When the coil is energized, the contact will be pull away from the other stationary contact, thus opening the circuit.

* At this point electricity that was previously flowing when the contacts were closed, will no longer be flowing when the coil is energized.

* It is important to note that the contact side of a normally closed relay will be energized. So at any given point either the coil side or contact side will have power to it.

* Let me show you how this works

o Double Throw Relay

* There are also relays that give us both options in the same relay. This is called a double throw relay

* What is important to not about a double throw relay is that we have the ability to control two different circuits with the same relay.

* So a double throw relay will let us wire one circuit to the normally open side, and another circuit to the normally closed side.

* When the coil is energized the normally closed contact will open and the normally open side will close.

* They both use the same power, or common.

o Let’s take a look at a few examples to better demonstrate how this works.

Get the FULL video transcript here: https://www.rspsupply.com/education/a-83-relays-single-throw-vs-double-throw/
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