The m-Series Mini Dual Circuit Plus Battery Switch in black is a great choice. It can switch two isolated battery banks at the same time or combine them for all loads. The make before break contact design ensures power - free switching between battery banks. This switch has a 3 - position setup, allows battery combination, and doesn't have an alternator field disconnect. With a maximum voltage of 32V DC, it has a continuous rating of 300A, an intermittent rating of 450A (5 min), 10 - sec cranking rating of 1000A, and 1 - min cranking rating of 650A. It has 2 battery inputs, needs 1.12in (28.45 mm) cable clearance for 4/0 AWG cables, and requires 4/0 AWG (120mm²) cables to meet ratings. The mounting holes accept #10 screws, and the terminal stud size is 3/8'-16 (M10) with a torque of 120 in - lb (13.56 Nm). It weighs 0.80lb (0.36 kg). WARNING: This product can expose you to chemicals like di(2 - ethylhexyl)phthalate (dehp), known in California to cause cancer, birth defects or other reproductive harm. More info at P65Warnings.ca.gov. Specifications: No AFD, 3 positions, 300a continuous amperage, box dimensions 3'H x 4'W x 7'L, 0.6 lbs weight, UPC 632085601126. Owner's Manual (pdf).



Using this battery switch is easy. First, make sure your battery cables are the right size (4/0 AWG or 120mm²). Connect the battery inputs to your battery banks. You can use it to switch between two isolated battery banks or combine them. When you turn the switch, thanks to its special design, there won't be a power interruption. Remember, this switch has 3 positions, so choose the one that suits your needs. As for maintenance, keep it clean and dry. Check the terminal studs regularly to make sure they're tightened to the recommended torque of 120 in - lb (13.56 Nm). Also, be aware that this product contains chemicals that can be harmful. For more information about these chemicals, visit P65Warnings.ca.gov.