The Cooper Bussmann 30 amp brass cartridge fuses are designed as 1-time fuses that are non-current limiting. These class K5 cartridges are intended for use in light-duty, general-purpose circuit applications. Protect lighting, heating and other circuits not subject to temporary surges and where available short-circuit currents are relatively low.
For general purpose circuits, size at amp rating of circuit
Non one-time fuses do not have any appreciable degree of time delay and thus should not be specified in circuits where large transients or motor overloads occur