scope:

This specification defines the qualification program for low voltage, supplemental fuses. Fuses covered will be limited to axial-leaded, radial-leaded and surface mount configurations having a current rating of no greater than 60 A, maximum voltage rating of 600 VAC/DC and interrupting rating of 10,000 A maximum. The qualification program is defined in table 1, and the flow diagram. Specification sheets can be added, as required, to define specific products or to cover unique / specific requirements. This document does not relieve the suppliers of their responsibility to maintain their own company's internal qualification program and the fuses shall continue to meet all applicable requirements of UL 248-14 / CSA-C22.2 No. 248.14.

Three types of fuses are covered in this specification. They include:

Type I - The type I fuse is designed to operate (open) within a given time period at 200% overload. The remainder of this specification is written with the 200% overload test as the standard.

Type II - The type II fuse is designed to operate (open) within a given time period at 250% overload. For a Type II fuse, the 250% overload shall be substituted throughout this specification where 200% overload is noted. All other requirements shall continue to be met.

Type III - The type m fuse is designed to operate (open) within a given time period at 300% overload. For a Type m fuse, the 300% overload shall be substituted throughout this specification where 200% overload is noted. All other requirements shall continue to be met. 

Preconditioning

This process is intended to simulate exposure to the thermal and cleaning environments of the assembly process before qualification testing. The component assembly process simulation requirements for different types of processes are described in annex A.