UL 248-7:2000 pdf download Low-Voltage Fuses – Part 7: Class H Renewable Fuses
General
NOTE –
This Part is intended to be read together with the Standard for Low-Volage Fuses – Part 1: General Requirements, hereafterrelerred to as Part 1. The numbering of the Clauses in this Part correspond to like numbered Clauses in Part 1. The requirementsof Part 1 apply unless modified by this Part. For Clauses not shown below, reler to the Standard for Low-Voltage Fuses – Part 1.General Requirements,NMX-J-009/248/7-2000-ANCE CAN/CSA C22.2 No.248.1 UL 248-1.
1.1 Scope
This Part applies to Class H Renewable fuses rated 600 A or less and either 250 or 600 V ac. DC ratingsare optional.
4 Classification
Class H Renewable fuses have an interrupting rating of 10,000 A. Each of the voltage ratings, 250 V acand 600 V ac, is divided into six body sizes with the maximum current rating, ln, for each size as specifiedin this Part. These fuses are not classified as current limiting. Time-delay ratings are optional.
These fuses may be restored to service after operation by the replacement of the renewal element withone recommended by the manufacturer.
5 Characteristics
5.2 Voltage rating
For AC, the rating shall be 250 or 600 V ac in accordance with dimensions shown in Figures A and BThe 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 : The fuse shall be marked ″Renewable″ and with the recommended renewal element.
Each renewal element shall be marked in accordance with Part 1 , Clause 6.1 , Items a, b, and c.
g) The fuse shall not be marked ″Current Limiting.″
7 Construction
7.1 Dimensions
Fuse dimensions are shown in Figures A and B.
UL 248-7:2000 pdf download
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