Using the supplied bolt attach switch to battery post. This is rated at 125 amps continuous 500amps surge.

Perko Compact Medium Duty Main Battery Disconnect Switch
Side mount battery disconnect switch. Side mount compact battery disconnect switch is easy to install on negative battery side post only battery is disconnected by unscrewing the knob a few turns and reconnected by tightening the knob knob can be removed completely to deter theft compact size fits most battery compartments. Improve safety and security of stored vehicles. Battery doctor battery disconnects also improve safety and security of stored vehicles rvs and seasonal equipment. To connect the switch disconnect the wire on the negative terminal of your battery. Stop unwanted battery drain helps prevent theft tampering and unauthorized use. Mount on negative battery post easy to disconnect electrical power on any vehicle without tools.
Battery doctor dual battery disconnects mount on the negative battery side that make disconnecting and reconnecting the battery quick and easy. To disconnect the switch use a wrench to loosen the nuts then unplug the switch on the negative side. Eliminates battery drain on idle batteries. Insert the screws and tighten them securely with a wrench. You will not loose your radio seat alarm or mirror settings as this unit comes with all you need to keep the memory and save your vehicles battery. Product description anti theft battery disconnect switch and battery saver will fit both side post and top post.
Prevents shorts and fires when working on electrical systems. Insert the ⅜ inch hole into the terminal and then attach the battery wire to the other end. Disconnect ground cable from battery and attach it to mounting flange side of the threaded hole on the switch. Used for side mount post. Easy to install instructions. Turn black knob fully clockwise to connect battery power.
The mounting flange on the thru hole must contact the battery post.