Transfer Switch
What is the cheapest, most compact, simplest transfer switch I can buy? It only has to switch 120V, 15 amps max.
Forum Discussion
brulaz wrote:MEXICOWANDERER wrote:
To try and atone for my screwup may I suggest...?
http://www.ebay.com/itm/YC-GP-DPDT-2-YuCo-Power-Relay-110-120V-AC-Coil-30Amp-2-Pole-DPDT-Heavy-Duty-U-/282382602316?hash=item41bf50904c:g:G8cAAOSwXYtYukSS
I KNOW this style of relay can carry 30 amps of 240 vac either NO or NC. Matter of fact I like THIS relay even better. Transparent. Can view action and can view contact point.
Oh shoot I screwed myself. Now, I have GOT to order some of these...
Last year I got the NTE version of that switch, without the transparent case, for US$43 (C$57), on Amazon. But after buying a plastic electrical box to mount it in, and the wire strain reliefs for the box, and wiring it all in, I found it makes an insistent hummmmm when the coil is engaged and generates a fair amount of heat. It works fine though.
So am beginning to wish I had just bought a premade DC coil version like the 30A Prog Dynamics PD5110010 which I can get for C$88 on amazon.ca
Prog Dyn 30A Transfer Switch
And ok, I'm convinced. It's a good idea to switch BOTH hot and neutral!
Brulaz señor please check the imprinted label on the relay that hums. You received a DIRECT CURRENT (DC) 110 vdc relay. Whether by mistake or intention I cannot tell you.
These relays operate SILENTLY - period. And they do not heat up via the magnetic coil. I have purchased 100+ of these relays in 40+ years so my answer here is not guesswork. The Miss Kelley 2, or example has eighteen of these relays. By their accident they had 33 amperes passing through the NC contacts on the Bridge relay and I found the issue by accident they were running a pair of AC heaters off the same receptacle.
Now REVERSE the problem. Install a 120 volt AC relay in a 110 volt DC circuit. The relay will chatter badly. The magnetics lose about 30% if misapplied.
EDIT EDIT EDIT EDIT EDIT EDIT
I just now ran across this excellent piece in PDF format explaining this more in detail...
http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=13C3250_AppNote&DocType=CS&DocLang=EN
