Fast-acting, marine grade ATO Fuses open quickly to protect circuits from overloads and short circuits.It's a good idea to keep several spares of the most popular sizes of Sierra ATO Style Fuses on board to replace blown fuses while out on the water. ATO fuses have a fuse element that is open or exposed on the bottom of the fuse between the blades. Blade type fuses can be mounted in fuse blocks, in-line fuse holders or fuse clips. These fuses are color coded for amperage rating identification.0.207"W x 0.752"H x 0.76"LAvailable in commonly used amperage ratingsVisible indication of blown conditionFive fuses per package