This Stinger 80 amp relay can be used as a battery isolator. When you use more than 1 battery in your car, you want to isolate them when the engine is not running. This prevents excess wear on the batteries because they will not be able to drain themselves.
Or use it to switch a very high current load with a small current. Use it for high powered air compressors, etc.
For a more heavy duty relay, check out our Stinger 200 amp relay.