The Littelfuse 313/315 Slo-Blo fuse is designed to provide broad application requirements with reliable performance and cost-effective circuit protection. The fuse's unique design includes an indicating feature, where discoloration of the glass body instantly identifies the fuse upon opening, eliminating guesswork and time-consuming circuit testing. It offers the same quality performance characteristics as the standard 3AG Slo-Blo fuse and is suitable for use in appliance or utilization equipment to provide individual protection for components or internal circuits.