The Littelfuse 313/315 Series Slo-Blo fuse is designed to meet a broad range of application requirements, offering reliable performance and cost-effective circuit protection. The fuse's unique indicating design instantly identifies discoloration upon opening, eliminating guesswork and time-consuming circuit testing. It is suitable for use in appliances and utilization equipment, providing individual protection for components or internal circuits. The fuse is constructed with a glass body, nickel-plated brass cap, and tin-plated copper leads, ensuring durability and reliability. It operates effectively within a temperature range of -55°C to +125°C and meets various industry standards including MIL-STD-202G for terminal strength, solderability, vibration, humidity, and salt spray resistance.