Gigavac makes a low amp draw contactor I think it is the "TA" variety, but draws about 90ma.  I have the GX11 contactor rated for about 150amps.

Web stie:  http://www.gigavac.com/products/contactors/datasheets/gx11/index.htm

By the way - they are a great company to deal with. I originally bought the reg contacotr and they exchanged it out for the high efficiency one at no charge.

Dan Ballin