Yes, the specs are right. Up to 60v DC and up to 300 amps. Would I use it? Probably not. I paid five times that for a Blue Seas disconnect switch. Now maybe I overpaid, but Blue Seas is a trusted vendor here on the forum. I would be reluctant to put my trust in a $10 disconnect switch. If you used the switch only when there was no load/charge it would work. But that one time that you need to shutdown the system under a heavy load/charge? I think the potential in your system is beyond what that $10 switch can handle.