dc-rated contactors [RE-wrenches]

[Christopher Freitas - OutBack Power]

You can get DC rated mercury displacement relays fairly easily for 48 
vdc systems.  I am sure connect energy or other would have them.  BE 
SURE THEY ARE MADE TO SWITCH DC - not AC - as they use a different gas 
internally (hydrogen for DC vs. helium for AC).  There has been reports 
of contactors exploding (releasing mercury) when AC versions were 
accidentally used.  

For this reason you might also look at the Kilovac 200 amp 360 vdc UL 
listed contactor.  I've seen them listed for about 80$ or so.  Very nice 
product - but I have never seen a 48 vdc coil version.   

Christopher Freitas
OutBack Power Systems, Inc.
cfreitas at outbackpower.com  www.outbackpower.com
Tel 360 435 6030  Arlington WA USA

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