I am looking to buy some limit switches for my machine that I am nearing completion on and I found these. I am using a G540 and the recommended power supply that is rated for 48v and 7.3a.
http://cgi.ebay.com/4-CNC-Limit-Swit...item3ca09fcd51
Specs say that they are rated for 4 amps at 125 volts AC. and 1/2 amp at 125 vdc. And that these can be connected normally closed or normally open via the three sets of screw lugs.