Wide Application: Suitable for 12-48V systems to isolate and secure the electrical system, it can be used alone or locked together with other switches. It's widely used in cars, boats, RVs, campers, travel trailers, trucks, tractor, ATVs, UTVs, battery banks, and other electrical devices Battery ON/Off Switch: Used for DC 12V-48 V power systems, ON/OFF 2 positions; Rating: 275A DC continuous (1hr), 455A DC intermittent (5 min), 1250A DC cranking (10 sec). Stud Size: 2x3/8" (10mm) Safety Protection: This rv battery power cut switch comes with 2pcs copper conductive sheets extension mounting brackets, do not need additional battery cables or lugs, isolate the electrical system easily and safely, eliminate any power draw from the battery when vehicle or boat is not in use Note: This battery switch is specifically designed for 15-17mm negative battery terminals, don't force the product onto terminals that exceed the specified size. This product is divided into positive(+) and negative(-) two models, please choose according to demand Package Includes: 1 battery switch, 2 copper conductive sheets, 1 x negative battery terminal connector, 1 pure copper standard top post negative, 4 stainless steel mounting screws and caps, 1 Y wrench, 1 hex key Convenience & Quick: This battery disconnect switch is installed on the negative of the battery, direct fit and no modifications, after a simple assembly, hook up to top post of battery negative directly. Equipped with Y wrench and hex key for easy installation Heavy Duty Battery Kill Switch: The housing of the battery switch is made of ABS plastic, durable made for safety use; M10 tinned copper studs and nuts, 2pcs copper conductive sheet for safer and more reliable conductivity; rear cover insulates terminals against any short of circuits