1、Function: Dual battery selector switch can switch isolated battery packs to all loads or combine battery packs to all loads, make before break contact design allows switching without interrupting power. 2、Current: The 300A continuous rating is safe for installation on gasoline powered boats and the 400A intermittent rating is the maximum amount of current that can be loaded for a specified minimum period of time. 3、For Use with 2 Batteries: Isolator switch allows selection between batteries for starting and charging or operation of both in parallel. This switch can be used with 6‑32V. 4、Universal Application: Dual battery disconnect switch is universal, can be widely used for marine, boat, RV, big truck, modified car. 5、15mm Studs: Nickel plated copper studs for maximum conductivity and rust resistance, studs can accept M8 ring terminals, 15mm stud length accepts multiple cable terminals.