UL 248-14:2000 pdf download Low-Voltage Fuses一Part 14: Supplemental Fuses
1.1 Scope
This Part applies to supplemental fuses rated 60 A or less intended only for supplementary overcurrentprotection where branch circuit or equivalent applications are not involved. DC ratings are optional.
4 Classification
Supplemental fuses are constructed so they cannot be installed in fuseholders intended for fuses coveredin the other Parts of the Low-Voltage Fuse Standard series. Time-delay ratings are optional.
5 Characteristics
5.2 Voltage rating
The DC voltage rating may be different from the AC rating!
5.3 Current rating
60 A or less
5.5 Interrupting rating
For AC – 10,000 A unless otherwise specified below.
The DC interrupting rating may be different from the AC rating.
a) Microfuse: 50 A minimum interrupting rating
b) A fuse rated 250 V ac may have a dual interrupting rating. This rating shall be 10,000 A at125 V ac and a lower interrupting rating at 250 V ac as specified in Table A.
c) Fuses rated less than 125 V ac may have an interrupting rating less than 10,000 A.
d) Fuses with interrupting ratings greater than 10,000 A shall be rated 50,000 A or 100,000 A.
AC.
5.6 Peak let-through current and clearing 2t characteristicsNot specified.
6Marking
6.1 Marking of fuses
All required markings shall appear on the smallest package.
The term “Supplemental Fuse” is the appropriate fuse classification, but it does not have to be markedNeither a fuse nor its package shall bear a marking which states or implies that the fuse is current-limiting
Except for microfuses, the minimum marking on the fuse shall be:
a) the manufacturer’s name, trademark, or both;
b) current rating; and
c) voltage rating.
For microfuses, the smallest package shall be marked with the required information, except the fuse shalbe marked to indicate its current rating. lndication of current rating units, e.g. A, is not mandatory on thefuse. Color coding of microfuses is an acceptable type of marking and,when used, the applicable colorcode scheme shall be marked on the smallest package.
The designation “D may be used as a substitute for “Time Delay” (for qualifying fuses only).
7 Construction
7.1 Fuse dimensions
The dimensions of a supplemental fuse are not specified, except envelope dimensions are given for themicrofuse in Part 1, Clause 22.7.2.
8 Tests
8.1 General
8.1.1 Types of tests
Required test samples are shown in Table 1.

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