1PC 12V/24VDC 500A AMP 4 Pin Relay On/Off Car Auto Power Switch Plastic Double Batteries Isolator for Forklift Engineering
This product can be severed as main switch, automotive start relay and battery isolator. Put this relay between batteries as an isolator or in the main power.
Instantaneous energy can pass 500A. When working for a long time, the current is 200A.