75920 Cole Hersee master disconnect switch. High amperage capacity: 300A at 12V DC. This switch protects vehicles against tampering, theft and battery drain. Protects from hazards during vehicle servicing, and can be locked-out or tagged-out. 75920 provides an effective emergency power cutoff and can be used in both positive or in negative path applications. The Cole Hersee 75920 is waterproof and dustproof to IP67 (immersible). Switch can be located in the best location, regardless of environment. Large divider on base of the 75920 prevents accidental shorting of high energy cables. Fits standard master disconnect mounting pattern. Knob is secured in place with a set screw.