UL 248-6-2020 pdf free download.Low-Voltage Fuses – Part 6: Class H Non-Renewable Fuses. 1.1 Scope This Part applies to Class H Non-Renewable fuses rated 600 A or less and either 250 or 600 V ac. DC ratings are optional. 4 Classification Class H Non-Renewable fuses have an interrupting rating of 1 0,000 A. Both of the voltage ratings 250 V ac and 600 V ac are divided into six body sizes with the maximum current rating in each size as specified in this Part. These fuses are not classified as current limiting. Time-delay ratings are optional. In Canada, 250 V ac fuses rated 1 5 – 60 A shall have a low melting point ″P″ (″D″ for time delay) characteristic. See Clauses 6.1 and 9.2. 5 Characteristics 5.2 Voltage rating For AC, the rating shall be 250 V ac or 600 V ac in accordance with dimensions shown in Figures A and B. The DC voltage rating may be different from the AC rating. 5.3 Current rating Refer to Figures A and B for range of current ratings in each body size for each voltage rating. 5.5 Interrupting rating For AC – 1 0,000 A For DC – 1 0,000 A 6 Marking 6.1 Marking of fuses In addition to the requirements in Part 1 : Fuses with a low melting point characteristic, for Canada, shall be marked with a ″P″ or with a ″D″ for time delay. g) The fuse shall not be marked ″Current Limiting.″ 7 Construction 7.1 Dimensions Fuse dimensions are shown in Figures A and B.UL 248-6 pdf download.
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