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Topic: 120V Relays (Read 11452 times) previous topic - next topic

Jeremy1998

Well, Christmas is too close to do this this year, so I want to do a big project next year.

For that, I need 120 volt relays. I need about a 3 amp rating each, just to be safe.

Before you go all nuts on me saying "Mains are dangerous! You can kill yourself!" I want to state something that I am quite proud of:

I have meen woking with mains since before I was out of diapers. I am 12 now... I have had my share of shocks, and I know how to work mains.

retrolefty

Relays have two key specifications, coil voltage and contact ratings. Did you mean with 120vac coils or some DC voltage coils?

If 120vac coils then these are pretty attractively priced:


http://www.allelectronics.com/make-a-store/item/RLY-453/120-VAC-RELAY-DPDT-12-AMPS//1.html

http://www.goldmine-elec-products.com/prodinfo.asp?number=G16440

Lefty

Jeremy1998

DC coil, AC contacts / whatever you call them... Should've mentioned that.

Jeremy1998

Also, I only need SPST.

The coil needs to be 5V DC to be interfaced with Arduino through a transistor.
The switch part needs to be 120VAC, for mains voltage. I am expecting about 2 amps, so 3 would be safe.

retrolefty

5vdc coil relays with that large a contact rating are not as common but this one is well priced and should work fine.


http://www.allelectronics.com/make-a-store/item/RLY-499/5-VDC-SPDT-6A-RELAY/1.html


Jeremy1998

#5
Dec 01, 2010, 02:56 am Last Edit: Dec 01, 2010, 02:57 am by Jeremy1998 Reason: 1
Will those handle 120 VAC though? As in on the switched contacts?

It seems that little rectangular blue relays are popular...

retrolefty

#6
Dec 01, 2010, 03:22 am Last Edit: Dec 01, 2010, 03:22 am by retrolefty Reason: 1
Quote
Will those handle 120 VAC though? As in on the switched contacts?


Typically questions like that are best answered by reading the manufacures datasheet. Typing the part number in for a google search will usually find a datasheet like here: http://www.hascorelays.com/electro_klt_series.asp

And reading the contacts tells you, yes, the contacts are rated for 120vac. So it's a good question but did you think I would recommend a part that wouldn't match your specs?  ;)

So learn to fish grasshopper and you will never go hungry for lack of information.

Lefty


Jeremy1998

A) No, you wouldn't tell me anything that woudn't work.
B) Did you really call me a young grasshopper? I don't hear many people say that anymore.

retrolefty

I have no idea how young you might be grasshopper.  ;)

Jeremy1998

12... I'm like a baby grasshopper.

pluggy

Have you considered solid state relays ?.  Much easier to interface to the arduino......
http://pluggy.is-a-geek.com/index.html

bld

Notice that solid state relays don't switch 100% off.
captain-slow.dk | non contagious!

Jeremy1998

Quote
Notice that solid state relays don't switch 100% off.


What? I'm so confused.

bld

A solid state relay don't switch off the same way as a relay with moving parts in.

When a 'normal' relay is switched off, it is switched off, and absolutely nothing going through it.

But when a solid state relay is off, it is still a bit on, but with such a high resistance that most things wont be able to do anything. But if you connect a power saving bulb, neon light, or something like that, they might just turn their brightness down when you switch them off.
captain-slow.dk | non contagious!

Jeremy1998

What about Christmas lights? That is the main use. That and blow up thingies (santa, ect.).

Also, I need some of them rated at roughly 15 amps, to run the air pumps to those blow-ups.

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