answersLogoWhite

0


Best Answer

A relay is an electrically actuated switch. There are a number of contacts actuated by a soleniod. When the solenoid is energized the position of the contacts changes, "throwing" the switch. The terminology of switches and relay contacts is as such: (number)p-(st(no/nc)/dt) The number followed by p is the number of poles. This is the number of independent "switches" in the unit. The (number)p may be replaced with sp (single pole) meaning 1p or dp (double pole) meaning 2p. ST stands for single throw, there is only two contacts for each pole. ST is usually suffixed with NO or NC in relays standing for normally open and normally closed. Normally open contacts conduct when the solenoid is energized. Normally closed contacts conduct when the soleniod if off. DT stands for double throw, meaning that there are 3 contacts per pole: a common contact, a NO contact, and a NC contact. So: a 3p-st NO relay has 3 switches that close when energized. a sp-dt relay has one 3 contact switch. An electrically actuated 3-way switch, if you will. a dp-st NC relay has one switch that opens when the solenid is energized.

User Avatar

Wiki User

โˆ™ 2007-06-03 23:37:40
This answer is:
User Avatar
Study guides

Add your answer:

Earn +20 pts
Q: What does a relay do?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Related questions

Where is the fan relay?

The fan relay is in the relay box next to the battery...it says fan relay on it.


What is auxiliary relay?

An auxiliary relay is a back-up relay in case the primary relay fails.


What is pick up of a relay?

The "pick up" of a relay is a setting at which the relay will begin to operate. Such as an overcurrent relay - if the pickup is set to 5A, when 5A is flowing through the relay, the relay will operate.


How many swim in a relay team?

It depends what relay you mean - a normal relay has four swimmers (e.g. an IM relay or a freestyle relay) bu relays such as a cannon relay can have more


Which relay is the starter relay on a 1994 Buick lesabre?

Which relay is the starter relay on a 1994 buick lesabre


Where is the relay switch on a 2002 Chevy Cavalier?

THE relay switch? Which one? The Light relay, AC relay? Turn signal relay? Be more specific.


How many people swim in a relay team?

It depends what relay you mean - a normal relay has four swimmers (e.g. an IM relay or a freestyle relay) bu relays such as a cannon relay can have more


How to find out if a relay is bad?

Swap relay with another like relay.


What is the difference between a relay and an auxiliary relay from constructionapplication poin of view?

I think aux relay is part of relay


Inhibitor relay location 1990 Nissan Stanza?

the inhibitor relay is between the a/c relay and the cornering relay


Earth fault relay and an overcurrent relay Methods to energise an earth fault relay?

Earth fault relay and an over current relay Methods to energies an earth fault relay with simulation diagram?


What is the relay located with the fuel pump relay on a 1991 S10 blazer?

That other relay should be the AC compressor relay.

People also asked