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Author Topic: 120V Relays  (Read 9993 times)
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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.
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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
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DC coil, AC contacts / whatever you call them... Should've mentioned that.
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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.
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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

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Will those handle 120 VAC though? As in on the switched contacts?

It seems that little rectangular blue relays are popular...
« Last Edit: November 30, 2010, 08:57:25 pm by Jeremy1998 » Logged

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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?  smiley-wink

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

Lefty

« Last Edit: November 30, 2010, 09:22:39 pm by retrolefty » Logged

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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.
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I have no idea how young you might be grasshopper.  smiley-wink
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12... I'm like a baby grasshopper.
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Have you considered solid state relays ?.  Much easier to interface to the arduino......
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Notice that solid state relays don't switch 100% off.
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Notice that solid state relays don't switch 100% off.

What? I'm so confused.
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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.
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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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