UL 248-12:2000 pdf download Low-Voltage Fuses – Part 1 2: Class R Fuses
General
NOTE-
This Part is intended to be read together with the Standard for Low-Voltage Fuses – Part 1: General Requirements, hereafterrefered to as Part 1. The numbering of the Clauses in this Part corresponds to like numbered Clauses in Part 1. The requirementsof Pat 1 apply unless modified by this Part. For Clauses not shown below, refer to the Standard for Low-Voltage Fuses – Part 1:General Requirements,NMX-J-009/248/12-2000-ANCE + CSA C22.2 No.248.1 UL 248-1.
1.1 Scope
This Part applies to Class R fuses rated 600 A or less and either 250 or 600 V ac. DC ratings are optional.
4 Classification
Class R fuses are non-renewable and current-limiting. with an interrupting rating of 200,000 A. Class Pfuses are divided into sub-classes RK1 and RK5 and are physically interchangeable for the same currentand voltage ratings. Class RK1 fuses have lower specified maximum peak let-through current and clearing’t characteristics. Each of the voltage ratings, 250 and 600 V ac, is divided into six body sizes. Themaximum current rating, in, for each size is specified in this Standard. Time-delay ratings are optional.
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 B.
The DC voltage rating may be different from the AC rating.
5.3 Current rating
Refer to Figure A for range of current ratings in each body size for each voltage rating.
5.5 Interrupting rating
For AC – 200,000 A
For DC, the preferred ratings are 10,000, 20,000, 50,000, 100,000, 150,000, or 200,000 A.
UL 248-12:2000 pdf download
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