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.