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UL 248-9 Ed. 3-2025

Low-Voltage Fuses - Part 9: Class K Fuses - Published Date: December 10, 2025

1.1 This Part is intended to be read together with the Standard for Low-Voltage Fuses – Part 1: General Requirements, hereafter referred to as Part 1. The titles of the Clauses in this Part correspond to the similarly titled Clauses in Part 1. The requirements of Part 1 apply unless modified by this Part. For the Part 1 requirements, refer to the Standard for Low-Voltage Fuses – Part 1: General Requirements, NMX-J-009-248/1-ANCE / CSA C22.2 No. 248.1 / UL 248-1.  1.2 This Part applies to Class K fuses rated 600 A or less and either 250 or 600 V ac. DC ratings are optional.

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