Class RK1 & RK5 Fuses

Name brands like: Bussman, Gould Shawmut, Littelfuse, Tron to name a few;

These were the earliest type of current-limiting fuse developed. Their single-element, silver link design enables them to provide fast-acting overload and short circuit protection. When used to protect inductive loads such as motors, solenoids, and transformers they must be greatly oversized to prevent opening the fuses on harmless inrush currents.

In these cases though they only provide short circuit protection.

There applications can be:

a. Resistance heaters
b. Lighting circuits
c. Non-inductive loads

Molded case circuit breaker load centers and Panelboards have increased interrupting rating when used with these fuses. Refer to the Panelboard/loadcenters manufacture's literature to more information.