Enjoy greater peace of mind with the Battery Doctor 20304 Battery Isolator Switch. Installation and usage is fast and simple. It offers an effective way to ensure that you control access to your battery, improving the safety and security of your stored vehicles, RVs and seasonal equipment. This Battery Doctor switch is a battery disconnect that mounts on the negative battery side so that disconnecting and reconnecting the battery is quick and easy. It's an effective way to stop unwanted battery drain and help prevent theft, unauthorized use or tampering when your vehicle is unattended. It offers 100A continuous at 12V with surge capabilities up to 500A surge at 12V. This rotary switch is RoHS compliant. It requires a 0.75″ hole for mounting.