Relay from arduino (5V) to switch on/off mains (24V) circuit

Other Hardware General Electronics
1

Hi,

Due to the vast range of option available I'm having difficulty finding an appropriate relay for my project.

I have successfully written the code for my project but I now need to find a relay (preferably a PCB mountable one) that I can use to control the circuit on and off.

If anyone could offer and help/guidance, it would be greatly appreciated!!

2

I doubt that the mains voltage is 24V. Please correct the title.

I do not know of a single relay that can be controlled by an Arduino and can control 240 volts, but I suspect that there are Solid State Relays that can do this. It may be simpler and more obtainable to use the Arduino to control a relay that controls another relay.

3

Sorry for my limited understanding.

I need a relay to control the output of this power supply.

Does that make it a little clearer?

4

Hi,
I agreed with vaj4088 for his recommendation of using a solid state. Since it is a opto couple interface it will give you isolation between the micro and the high voltage.

5

If you just want to switch the output of that PS then a normal 12Vdc 10A or above relay will do, switched from the arduino by a transistor

This relay will do the job

http://www.maplin.co.uk/p/12v-dc-20a-spdt-relay-n93ed

You will need a 12V power source to supply the coil via the transistor

6

There are dozens and dozens of relay boards available for the Arduino that will do what you require. I am not sure I understand some replies here!

Here is a 5V relay board that is opto coupled, can be controlled directly from an Arduino output pin, and will switch 240V AC. This one is from China, but it shows you what you need to order.