Compatibility: The top post knife edge main switch is suitable for battery side post terminals with 3/8'' holes and only for negative battery terminals. 250A continuous and 750A momentary at DC 12V. It is widely used in most vehicles such as cars, boats, trucks, RVs, ATVs and other electrical equipment. Heavy Duty: The battery disconnect switch is made of durable pure copper material, which has good electrical conductivity and can ensure your safety in use. In addition, it is very hard and reliable, resistant to corrosion, rust, oxidation or breakage. Reduce Battery Consumption: When your car needs to be idle for a long period of time, long periods of non-use will shorten the life of your battery, making you have to replace it. Our battery cut-off switch will help you isolate and protect the electrical system from battery leakage which greatly extends the life of your battery. Such a small tool can prevent your battery from being damaged and save the cost and time of repair. Easy to Use: The car battery cut-off switch is designed with a vertical knife blade, so you can simply lift the knife to cut off the power, which is very fast and easy. It not only helps reduce battery consumption, but also prevents short circuits and fires while the electrical system is working.