Looking for SPDT Relay 12Volt Coil Load 30Amp 120/240VAC

[bendiy]

I'm trying to find a good relay to switch a heating element from 120V to 240V. It should be SPDT and handle at least 30 Amps. I want it to have a 12 volt coil so I can easily control it via automation.

I'm finding a lot of 30A SPDT relays, but I think they are for 12V DC Automotive uses and cannot handle switching 120/240VAC.

What are you guys using for this?

Here's some I'm finding, but I don't know if they will work.
http://www.mouser.com/Search/ProductDetail.aspx?qs=%2bLh6ltJumVTzl%2bM5d0pymA==

http://www.mouser.com/Search/ProductDetail.aspx?qs=Z6du6qo9UsZRRCMC9q8VHA==

http://www.ebay.com/itm/ONE-12V-DC-...t=Car_Audio_Video&hash=item2a15d708c9&vxp=mtr

 

[Maxkling]

http://www.automationdirect.com/adc...en-Style,_40A_(AD-PR40_Series)/AD-PR40-1C-12D

Also just looking the first one you listed should work also.

 

[bendiy]

I'm not sure about the datasheet on the first one:
http://www.onlinecomponents.com/viewer.aspx?p=11725634

It shows the Normally Open (N.O. Load) as 30 Amps and the Nomally Closed (N.C. Load) as 10 Amps. I think I would want the normally closed, fail safe circuit to be the 120V and the one that closes when the coil is powered to be the high voltage, 240V. That way if the relay fails, it's on a lower voltage. A 5500W element is going to draw at least 11 Amps when running on 120V (1375W) instead of 240V. I need a relay that is rated up to 15 Amps on the NC load and 30 Amps on the NO load.

 

[bendiy]

I'm still trying to dig up a good source for these. All the relays under $10 are either not rated for enough amps or are DC only. I can get DPDT relays to do this for about $7.50, but I'm trying to cram two relays (SPDT to switch between 120V and 240V & DPDT for main shutoff) into a small box and I want to save space and get a SPDT for around $5 or less.

 

[TonyG]

You might check out this guy:
http://www.alliedelec.com/search/productdetail.aspx?SKU=70132358#tab=specs
Looks like the spec sheet for 125/240VAC switching is 30 amps for N.O. and 15 amps for N.C.

 

[grandequeso]

you can find 24v coil relays and step down transformers really cheap as they are extremely common in the hvac field. Basically every air conditioner has a set of each inside it.

 

[thargrav]

Here is one that's panel mountable, with 12 VDC coil, and contacts rated at 30A & up to 277 VAC for $13.92.

http://www.digikey.com/product-detail/en/T92P11D22-12/PB349-ND/290991

For the price & mounting convenience you could just wire one side.

 

[stamandster]

There are some on ebay for HVAC controls. I've seen 240v SPDT.