1、Function: Power On Off switch prevents any current from being drawn from the battery when your RV, van, boat, or car is not in use, to extend battery life. 2、Parameter: The switch has a crank rating that withstands 675A for 30 seconds, 450A intermittent for 5 minutes, and 300A continuously, protecting against fluctuations during ignition. 3、Power Saving: The battery circuit shut off switch help eliminate any power draw from the battery when vehicle or boat is not in use, disconnects the battery safely. 4、Easy to Use: The simple design is easy to read and to operate, simply turn the knob to either the on, off or plus position, and a satisfying click will let you know it's changed. 5、Practical: This battery isolator switch is used for 32V DC systems to isolate and secure the electrical system, tand the casing design allows for front or rear panel mounting.