Single pole, double throw mini relay with bracket, no diode.
This spdt relay has hundreds of applications in the marine, RV, equipment, and automotive industries. It is one of the most popular relays.
Terminals 85, 86, 87, 87a, and 30, typical wiring method is as follows: There are other ways to wire it, but this is the most common. 85 and 86; 85 is ground and 86 is 12v switched power from a remote location. 87 is battery power (usually a heavier wire) 30 is the output terminal to feed the load 30 amp, 50 amp max momentary load - 12VDC