The Littelfuse 313/315 Series Slo-Blo[®] fuse is a time-lag fuse designed for a broad range of applications requiring reliable performance and cost-effective circuit protection. Its unique indicating design, which shows discoloration upon opening, eliminates guesswork and reduces circuit testing time. This fuse offers the same quality performance characteristics as standard 3AG Slo-Blo[®] fuses and is suitable for use in appliances and utilization equipment to provide individual protection for components or internal circuits. It features a glass body, nickel-plated brass cap, and tin-plated copper leads, meeting MIL-STD-202G standards for terminal strength, solderability, and various environmental conditions.