Just got a few of these in and had the opportunity to try one out today. It worked very well (at 24 VDC)
http://www.ebay.com/itm/381740526079?_trksid=p2060353.m2749.l2649&ssPageName=STRK:MEBIDX:IT
http://www.ebay.com/itm/381740526079?_trksid=p2060353.m2749.l2649&ssPageName=STRK:MEBIDX:IT