UL 248-12:2000 pdf download – Low-Voltage Fuses – Part 12:Class R Fuses.
The Canadian Standards Association, which operates under the name CSA International (GSA), provides certification services for manufacturers who, under license from CSA, wish to use the appropriate registered CSA Marks on certain products of their manufacture to indicate conformity with CSA Standards.
CSA Certification for a number of products is provided in the interest of maintaining agreed-upon standards of quality, peilormance, interchangeability and’or safety. as appropriate. Where applicable, certification may form the basis for acceptance by inspection authorities responsible for enforcement of regulations. Where feasible, programs will be developed for additional products for which certification is desired by producers, consumers or other interests.
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Products in substantial accord with this Standard but which exhibit a minor difference or a new feature may be deemed to meet the Standard providing the feature or difference is found acceptable utilizing appropriate CSA Certification and Testing Division Operating Procedures. Products which comply with this Standard shall not be certified if they are found to have additional features which are inconsistent with the intent of this Standard. Products shall not be certifiable if they are discovered to contravene applicable laws or regulations.
Testing techniques, test procedures and instrumentation frequently must be prescribed by the CSA
Certification and Testing Division in addition to the technical requirements contained in Standards of GSA.
In addition to markings specified in the Standard, the CSA Certification and Testing Division may require
special cautions, markings and instructions that are not specified by the Standard.
Some tests required by CSA Standards may be Inherently hazardous. The Association neither assumes nor accepts any responsibility for any injury or damage that may occur during or as the result of tests, wherever performed, whether performed in whole or in part by the manufacturer or the Association, and whether or not any equipment, facility or personnel for or in connection with the test is furnished by the manufacturer or the Association.
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I General
NOTEThÉs Pail is intended to be read togelfler v.Wh the Standard For Low- Vottage Fuses – Part 1: General Requirements. hereafter
reteired to as Part I. The number*ig or The Clauses In This Pair coiresponds to Ske numbered Clauses in Part 1. The requirements of Part I apply ur*ss modifIed by this Parr For Clauses riot SfIOi,ri bek,w, refer to ifi Standard For Low Vofta Fue$ – Part F:
Ger,e,at Requirements. NMX-J-OO924&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 R fuses are divded into sub—dasses RK1 and RK5 and are physically interchangeable for the same current and voltage ratings. Class RKI fuses have lower specified maximum peak let-through current and clearing 121 characteristics. Each of the voltage ratings. 250 and 600 V ac, is divided into six body sizes. The maximum 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.