S506-315-R is a time-delay fuse designed for circuit protection applications requiring low breaking capacity. It features a 5 x 20 mm physical size with a glass tube and nickel-plated brass endcap construction, rated at 250 Vac with a 315 mA nominal current rating. The fuse exhibits a cold resistance of 0.450 O and a typical DC melting current of 0.621 A, with a typical melting point of 250 mV. Designed to IEC 60127-2/3 standards and their extensions, this fuse provides reliable protection with time-delay characteristics that allow brief current surges while protecting against sustained overcurrent conditions. It is widely used in industrial control systems, consumer electronics, and power distribution applications where selective protection and coordination with other circuit elements are required.