fuse tap protects original circuit and provide a lead for new circuit. These fuse taps allow for non-invasive installation of any 12/24v electrical accessory into your vehicle. Just crimp a fuse tap on the end of your bare wire, then plug and play at the fuse box. Compatible with low-profile mini blade fuses, Easy to add a fuse to protect car alarm, dash cam, GPS, Cell phone charger, DVD player, satellite radio etc.