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It's rated and designed for 50 amps, uses #8 wire with shield (=GND), which connects directly to the battery terminals (+ and -). It's used with radios, intercoms and combinations of both and provides surge, overload and reverse polarity protection.

Via the MX7777, perhaps I wasn't clear on that point in the post above.

Use the MX7777 suppressor for all your supplies, it's wired to the battery and provides the protection you need for all your accessories. Problem may be finding the cables, but they are out there. Image below shows location of the unit (disregard the mess around it).