ANSI UL 248-3-2000 UL Standard for Safety Low-Voltage Fuses C Part 3 Class CA and CB Fuses (Second Edition Reprint with Revisions Through and Including November 20 2014).pdf

1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 248-3 Low-Voltage Fuses Part 3: Class CA and CB FusesUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUT

2、HORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Low-Voltage Fuses Part 3: Class CA and CB Fuses, UL 248-3 Second Edition, Dated August 1, 2000 Summary of Topics This revision of ANSI/UL 248-3 is being issued to reaffirm approval as an American N

3、ational Standard. No changes in requirements are involved. As noted in the Commitment for Amendments statement located on the back side of the title page, UL, CSA, and ANCE are committed to updating this harmonized standard jointly. However, the revision pages dated November 20, 2014 will not be joi

4、ntly issued by UL, CSA, and ANCE as these revision pages only address UL ANSI approval dates. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. The revisions are are substantially in accordance with Proposal(s) on t

5、his subject dated October 3, 2014. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provides this Standard as is w

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7、ss of data, or any other damages arising out of the use of or the inability to use this Standard, even if UL or an authorized UL representative has been advised of the possibility of such damage. In no event shall ULs liability for any damage ever exceed the price paid for this Standard, regardless

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9、le purchaser is storing an electronic Standard on the purchasers computer system. The requirements in this Standard are now in effect, except for those paragraphs, sections, tables, gures, and/or other elements of the Standard having future effective dates as indicated in the preface. The prior text

10、 for requirements that have been revised and that have a future effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. NOVEMBER 20, 2014 UL 248-3 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM U

11、L NOVEMBER 20, 2014 UL 248-3 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Low-Voltage Fuses Part 3: Class CA and CB Fuses August 1, 2000 (Title Page Reprinted: November 20, 2014) Canadian Standards Association CAN/

12、CSA-C22.2 No. 248.3-00 Second Edition Approved by Underwriters Laboratories Inc. UL 248-3 Second Edition ANSI/UL 248-3-2005 (R2014) National Association of Standardization and Certication of the Electrical Sector NMX-J-009/248/3-2000-ANCE First EditionUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTH

13、ER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Commitment for Amendments This standard is issued jointly by the Association of Standardization and Certication (ANCE), the Canadian Standards Association (operating as “CSA Group”), and Underwriters Laboratories Inc. (UL). Comments or propo

14、sals for revisions on any part of the standard may be submitted to ANCE, CSA Group, or UL at anytime. Revisions to this standard will be made only after processing according to the standards development procedures of ANCE, CSA Group, and UL. CSA Group and UL will issue revisions to this standard by

15、means of a new edition or revised or additional pages bearing their date of issue. ANCE will incorporate the same revisions into a new edition of the standard bearing the same date of issue as the CSA Group and UL pages. Copyright 2005 ANCE Rights reserved in favor of ANCE ISBN 1-55324-230-0 Copyrig

16、ht 2000 CSA Group All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission of the publisher. Copyright 2014 Underwriters Laboratories Inc.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION F

17、ROM UL CONTENTS Preface .4 1 General 9 1.1 Scope .9 4 Classication .9 5 Characteristics 9 5.2 Voltage rating 9 5.3 Current rating 9 5.5 Interrupting rating 10 5.6 Peak let-through current and clearing I 2 t characteristics 10 7 Construction .10 7.1 Dimensions .10 8 Tests .12 8.2 Verication of temper

18、ature rise and current-carrying capacity .12 8.3 Verication of overload operation 13 8.4 Verication of operation at rated voltage .13 8.5 Verication of peak let-through current and clearing I 2 t characteristics .14 AUGUST 11, 2005 NMX-J-009/248/3-2000-ANCE CAN/CSA-C22.2 NO. 248.3-00 UL 248-3 3UL CO

19、PYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Preface This is the common UL, CSA, and ANCE Standard for Low-Voltage Fuses Part 3: Class CA and CB Fuses. This is the second edition of CAN/CSA-C22.2 No. 248.3-00 (superseding the rst edition, publ

20、ished in 1996), the second edition of UL 248-3, and the rst edition of NMX-J-009/248/3-2000-ANCE. This Standard was prepared by a Technical Harmonization Committee comprised of members from Underwriters Laboratories, CSA International, the National Association of Standardization and Certication of t

21、he Electrical Sector, the end product manufacturers, and material suppliers. The efforts and support of the members of the Technical Harmonization Committee are gratefully acknowledged. The present Mexican Standard was developed by the TC 32 Fuses from the Comite de Normalizacion de la Asociacion de

22、 Normalizacion y Certicacion, A.C., CONANCE, with the collaboration of the fuse manufacturers and users. This Standard was reviewed by the CSA Subcommittee on Fuses and approved by the Technical Committee on Industrial Products under the jurisdiction of the CSA Strategic Steering Committee on the Re

23、quirements for Electrical Safety. This Standard has been approved by the American National Standards Institute (ANSI) as an American National Standard. This ANSI/UL Standard for Safety consists of the Second Edition including revisions through November 20, 2014. The most recent designation of ANSI/U

24、L 248-3 as a Reaffirmed American National Standard (ANS) occurred on November 20, 2014. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page (front and back), or the Preface. Comments or proposals for revisions on any part of the Standard may be submitted to UL

25、 at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. To purchase UL Standards, visit Comm 2000 at http:/m- or call toll-free 1-888-853-3503. Note: Although the intended primary application of this Standard is s

26、tated in its Scope, it is important to note that it remains the responsibility of the users of the Standard to judge its suitability for their particular purpose. Level of Harmonization This trinational standard is published as an Identical Standard. An identical standard is a standard that is the s

27、ame in technical content except for conicts in Codes and Governmental Regulations. Presentation is word for word except for editorial changes. Interpretations The interpretation by the SDO (Standards Development Organization) of an identical standard shall be based on the literal text to determine c

28、ompliance with the standard in accordance with the procedural rules of the SDO. If more than one interpretation of the literal text has been identied, a revision shall be proposed as soon as possible to each of the SDOs to more accurately reect the intent. NOVEMBER 20, 2014 NMX-J-009/248/3-2000-ANCE

29、 CAN/CSA-C22.2 NO. 248.3-00 UL 248-3 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL ANCE Effective Date The effective date for ANCE will be announced through the Diario Ocial de la Federation (Official Gazette) and is indicated on the cove

30、r page. AUGUST 2, 2010 NMX-J-009/248/3-2000-ANCE CAN/CSA-C22.2 NO. 248.3-00 UL 248-3 4AUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 2, 2010 NMX-J-009/248/3-2000-ANCE CAN/CSA-C22.2 NO. 248.3-00 UL 248-3 4B No Text on This PageUL COP

31、YRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CSA Effective Date The effective date for CSA will be announced through CSA Informs or CSA Certication Notice. UL Effective Date This edition of the standard is now in effect. AUGUST 11, 2005 NMX-J-0

32、09/248/3-2000-ANCE CAN/CSA-C22.2 NO. 248.3-00 UL 248-3 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL This page intentionally left blank. AUGUST 11, 2005 NMX-J-009/248/3-2000-ANCE CAN/CSA-C22.2 NO. 248.3-00 UL 248-3 6UL COPYRIGHTED MATERIA

33、L NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL This page intentionally left blank. AUGUST 11, 2005 NMX-J-009/248/3-2000-ANCE CAN/CSA-C22.2 NO. 248.3-00 UL 248-3 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION F

34、ROM UL This page intentionally left blank. AUGUST 11, 2005 NMX-J-009/248/3-2000-ANCE CAN/CSA-C22.2 NO. 248.3-00 UL 248-3 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Low-Voltage Fuses Part 3: Class CA and CB Fuses 1 General NOTE This Par

35、t 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 modied by this Part. For Clauses n

36、ot shown below, refer to the Standard for Low-Voltage Fuses Part 1: General Requirements, NMX-J-009/248/3-2000-ANCE CAN/CSA C22.2 No. 248.1 UL 248-1. 1.1 Scope This Part applies to Class CA and CB fuses rated 60 A or less and 600 V ac. DC ratings are optional. 4 Classication Class CA and CB fuses ar

37、e non-renewable and current limiting, with an interrupting rating of 200,000 A. Class CA fuses have one body size. Class CB fuses are divided into two body sizes. The maximum current rating, I n , for each size is specied in this Part. 5 Characteristics 5.2 Voltage rating For AC, the rating shall be

38、 600 V ac. The DC voltage rating may be different from the AC rating. 5.3 Current rating Class CA fuses shall be rated 30 A or less. Class CB fuses shall be rated 60 A or less. Refer to Figure B for range of current ratings in each body size. AUGUST 11, 2005 NMX-J-009/248/3-2000-ANCE CAN/CSA-C22.2 N

39、O. 248.3-00 UL 248-3 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 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. 5.6 Peak let-through current and clearin

40、g I 2 t characteristics Maximum values of peak let-through current and clearing I 2 t are given in Table A. Table A Maximum peak let-through current and clearing I 2 t for Class CA and CB fuses at 200 kA Class and current rating I n , Peak let-through current, I 2 t, ampere-squared seconds AA Class

41、CA 8,000 6,000 Class CB 1 30 10,000 10,000 31 60 15,000 60,000 7 Construction 7.1 Dimensions Fuse dimensions are shown in Figures A and B. This is generated text for gtxt. AUGUST 1, 2000 NMX-J-009/248/3-2000-ANCE CSA C22.2 NO. 248.3-00 UL 248-3 10UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER RE

42、PRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Figure A Dimensions of Class CA fuses in mm Maximum overall length Maximum outside diameter Maximum blade width Thickness of blade Distance between mounting centers Width of slot Minimum length of slot Maximum overall height Maximum overall body

43、length ACD E FH a J b PS min max 56 14.5 11.2 0.78 1.50 44.5 4.5 5.5 14.5 36.5 a Tolerance 0.5 mm. b It is permissible to extend the xing slots or form open-ended slots. AUGUST 1, 2000 NMX-J-009/248/3-2000-ANCE CSA C22.2 NO. 248.3-00 UL 248-3 11UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPR

44、ODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL This is generated text for gtxt. 8 Tests 8.2 Verication of temperature rise and current-carrying capacity 8.2.3 Test method 1.0 I n Temperature rise 1.1 I n Current-carrying capacity, I nf Figure B Dimensions of Class CB fuses in mm Current rating

45、I n , A Overall length Maximum outside diameter Blade width Thickness of blade Blade offset from axis Maximum overall body length ACDENS min. max. min. max. min. max. min. max. 0 30 56.5 62.0 14.5 10.8 13.0 0.78 1.50 3.2 3.8 36.5 31 60 65.0 69.0 17.5 14.5 15.5 1.20 1.60 3.2 3.8 39.5 AUGUST 1, 2000 N

46、MX-J-009/248/3-2000-ANCE CSA C22.2 NO. 248.3-00 UL 248-3 12UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 8.2.3.1 Fuses rated 600 A or less In addition to the requirements in Part 1: At the conclusion of the temperature rise test, the test

47、current shall be increased without interruption to 1.1 I n for a period of not less than 15 min. Temperature is not to be monitored during this time. 8.2.4 Acceptability of test results In addition to the requirements in Part 1: The maximum temperature rise shall not exceed the following: Contacts 7

48、5C 8.3 Verication of overload operation Part 1, Table 4 Test 1 1.35 I n Test 3 2.0 I n 8.4 Verication of operation at rated voltage For AC Part 1, Table 5 Test 1 200 kA Test 2 Maximum energy Test 3 Threshold ratio. The maximum threshold ratio shall be 60. Test 5b2I n Peak let-through current and cle

49、aring I 2 t recorded during Test 1. For DC Part 1, Table 6 Test 1 Interrupting rating Test 2 Maximum energy Test 5c2I n AUGUST 11, 2005 NMX-J-009/248/3-2000-ANCE CSA C22.2 NO. 248.3-00 UL 248-3 13UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 8.5 Verication of peak let-through cur