A new current-limiting fuse

Increasing concentration of power combined with the desire for more compact switchgear assemblies has created a demand for small, totally enclosed, high-interrupting-capacity fuses suitable for potential and operating transformer protection. The current-limiting fuse meets these requirements for it is inherently a high-interrupting-capacity fuse of low current rating and can be totally enclosed in a small space. The theory and construction of previous current-limiting fuses are briefly described. The theory and construction of a new current-limiting fuse is given. The new fuse is simple in theory and construction. Its fundamental elements can be separated, studied, and tested, making it possible to predict an unusual degree of reliability and freedom from voltage surges. Test results confirm the reliability, high interrupting capacity, and freedom from voltage surges of the new fuse.