Is there a reason not to use the contactors Auber sells when building a 240v electric kettle? The price seems reasonable.http://www.auberins.com/index.php?main_page=product_info&products_id=129
I just installed one on my rig. It works like a dream. I got it really fast too. I ordered it on a Wednesday morning and got it Friday morning.
I used one, works great, no complaints! And for $19 or whatever it is, it was about $50 cheaper than buying one locally.
Gives me confidence that my lines are fully shut off when I flip that switch
These by far are more superior, but Aubers will work. I definitely recommend using contactors either way. http://www.homebrewtalk.com/f16/contactors-e-brew-heating-elements-273489/
I use 2 auber contactors and they work fine
I used these 30 Amp 120 Volt coil contactors and have been quite pleased - http://www.amazon.com/gp/product/B001KGSJ74/ref=oh_o06_s00_i00_details
A real steal for only $6.50 each.
BlakeElectric BIAB Build | BIAB Mesh False Bottom | Controller/Fermentation Chest