UL 248-11:2011 free download

UL 248-11:2011 free download Low-Voltage Fuses – Part 1 1 : Plug Fuses
1 General
NOTE-
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 numbering of the Clauses in this Part correspond to like numbered Clauses in Part 1.The requirements of Part 1 apply unless modified by this Part. For Clauses not shown below, refer to the Standard forLow-Voltage Fuses – Part 1 : General Requirements,NMX-J-O09/248/1-ANCE·CANCSA C22.2 No.248.1 UL 248-1.
1.1 Scope
This Part applies to plug fuses rated 30 A or less and 125 V ac(127 V ac for Mexico). DC ratings areoptional.
4 Classification
Plug fuses are non-renewable and not current limiting, with an interrupting rating of 10,000 A. Plug fusesare divided into 3 sub-classifications.Time-delay ratings are optional.
Edison-base
Plug fuses which are interchangeable for all current ratings. No rejection feature isused.See Figure A.
Type C
Plug fuses which have a non-interchangeable feature for 3 current ranges (0-15,16-2o, and 21 – 30 A).See Figure A.
Type s
Plug fuses which have a non-interchangeable feature for 11 current ranges (0.1一1，1.125 – 1.25;1.4 -1.6;1.8- 2.0;2.25-2.5;2.8-3.2;3.5一4; 4.5-5;5.6-6.25;7一15; and 16-30 A).See Figure B.
ln Canada only,Type C and Type s fuses may be used, and for all ratings 15 -30 A, these fuses shallhave low melting point “P”(“Dfor time delay) characteristics.
5 Characteristics
5.2 Voltage rating
For AC, the rating shall be 125 V ac or, for fuses intended for installation in Mexico, the rating shall be127 V ac.
The DC voltage rating may be different from the AC rating.
5.3 Current rating
30 A and less.
5.5 Interrupting rating
For AC – 1 0,000 A
For DC – 1 0,000 A
6 Marking
6.1 Marking of fuses
c) voltage rating is optional;
d) interrupting rating is optional;
e) fuse classification is optional; and
g) a plug fuse shall not be marked ″Current Limiting.″
In addition to the requirements in Part 1 : Fuses for United States shall have a prominent hexagonal feature when rated 1 5 A or less. Fuses for Canada shall have a low melting point characteristic and shall be marked with a ″P″ or with a ″D″ for time delay.
7 Construction
7.1 Dimensions
Fuse dimensions are shown in Figures A and B.