Originally Posted by Dylan
Looks like it might be a relay?
Normally with a relay, you'd need at least three connectors on the bottom - one for +12 to activate the relay (grounded through the case), and a guzinta and guzouta terminal. With only two terminals on this one, I'm at a loss - perhaps a circuit breaker (although it appears to be labeled with "12 v", not a current rating), perhaps something else. Really hard to tell.