The BEP 721 Battery Selector Switch is a top - notch heavy - duty switch. It shares the same module as the 720, with removable plates and a back cover. While BEP Marine recommends isolated battery systems, the 721 offers an easy and cost - effective way to separate two batteries. Note that selector switches can't protect electronics from harmful engine starting spikes. The 721 has great specifications: 350 Amps DC continuous rating between common B1 or B2, 500 Amps DC continuous rating between common B1 + B2, 500 Amps DC intermittent rating, 1500 Amps DC cranking rating, 48 Volts DC voltage rating. It has a 1 - 2 - Both - off selector operation, can be recessed or surface - mounted, has 3 x 10mm (3/8') termination stud size, tin - plated copper studs and nuts, dimensions of 102 x 102 x 90H (4 x 4 x 3.5H'), and is ignition protected.
Using the BEP 721 Battery Selector Switch is easy. First, decide whether you want to connect Battery 1, Battery 2, both batteries, or turn it off. You can mount it either recessed or on the surface according to your needs. When it comes to safety, remember that this switch can't protect your electronics from engine starting spikes, so you may need additional protection for sensitive devices. For maintenance, regularly check the tin - plated copper studs and nuts. If they show signs of corrosion, clean them gently. Keep the switch in a dry place to prevent damage. Also, make sure the voltage doesn't exceed the 48 - volt DC rating. That way, your switch will keep working well for a long time.
