ANSI UL 248-4-2000 UL Standard for Safety Low-Voltage Fuses C Part 4 Class CC Fuses (Second Edition Reprint with Revisions Through and Including December 1 2014).pdf

1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 248-4 Low-Voltage Fuses Part 4: Class CC FusesUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED

2、 FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Low-Voltage Fuses Part 4: Class CC Fuses, UL 248-4 Second Edition, Dated August 1, 2000 Summary of Topics This revision of ANSI/UL 248-4 is being issued to reaffirm approval as an American National Standa

3、rd. 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 December 1, 2014 will not be jointly issued by

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10、eceded by a SUPERSEDED REQUIREMENTS notice. DECEMBER 1, 2014 UL 248-4 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 1, 2014 UL 248-4 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DIS

11、TRIBUTION WITHOUT PERMISSION FROM UL LOW-VOLTAGE FUSES PART 4: CLASS CC FUSES August 1, 2000 (Title Page Reprinted: December 1, 2014) Canadian Standards Association CAN/CSA-C22.2 No. 248.4-00 Second Edition Approved by Underwriters Laboratories Inc. UL 248-4 Second Edition ANSI/UL 248-4-2005 (R2014)

12、 National Association of Standardization and Certication of the Electrical Sector NMX-J-009/248/4-2000-ANCE First EditionUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Commitment for Amendments This standard is issued jointly by the Associa

13、tion of Standardization and Certication (ANCE), the Canadian Standards Association (operating as “CSA Group”), and Underwriters Laboratories Inc. (UL). Comments or proposals for revisions on any part of the standard may be submitted to ANCE, CSA Group, or UL at anytime. Revisions to this standard wi

14、ll 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 means of a new edition or revised or additional pages bearing their date of issue. ANCE will incorporate the same revisions into a

15、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 1-55324-232-7 Copyright 2000 CSA Group All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permi

16、ssion of the publisher. Copyright 2014 Underwriters Laboratories Inc.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM 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

17、 5.5 Interrupting rating .9 5.6 Peak let-through current and clearing I 2 t characteristics 10 7 Construction .10 7.1 Dimensions .10 8 Tests .10 8.2 Verication of temperature rise and current-carrying capacity .11 8.3 Verication of overload operation 11 8.4 Verication of operation at rated voltage .

18、11 8.5 Verication of peak let-through current and clearing I 2 t characteristics .12 AUGUST 11, 2005 NMX-J-009/248/4-2000-ANCE CAN/CSA-C22.2 NO. 248.4-00 UL 248-4 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Preface This is the common UL

19、, CSA, and ANCE Standard for Low-Voltage Fuses Part 4: Class CC Fuses. This is the second edition of CAN/CSA-C22.2 No. 248.4-00 (superseding the rst edition, published in 1994), the second edition of UL 248-4, and the rst edition of NMX-J-009/248/4-2000-ANCE. This Standard was prepared by a Technica

20、l Harmonization Committee comprised of members from Underwriters Laboratories, CSA International, the National Association of Standardization and Certication of the Electrical Sector, the end product manufacturers, and material suppliers. The efforts and support of the members of the Technical Harmo

21、nization Committee are gratefully acknowledged. The present Mexican Standard was developed by the TC 32 Fuses from the Comite de Normalizacion de la Asociacion de Normalizacion y Certicacion, A.C., CONANCE, with the collaboration of the fuse manufacturers and users. This Standard was reviewed by the

22、 CSA Subcommittee on Fuses and approved by the Technical Committee on Industrial Products under the jurisdiction of the CSA Strategic Steering Committee on the Requirements for Electrical Safety. This Standard has been approved by the American National Standards Institute (ANSI) as an American Natio

23、nal Standard. This ANSI/UL Standard for Safety consists of the Second Edition including revisions through December 1, 2014. The most recent designation of ANSI/UL 248-4 as a Reaffirmed American National Standard (ANS) occurred on December 1, 2014. ANSI approval for a standard does not include the Co

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29、fective Date The effective date for ANCE will be announced through the Diario Ocial de la Federation (Official Gazette) and is indicated on the cover page. AUGUST 2, 2010 NMX-J-009/248/4-2000-ANCE CAN/CSA-C22.2 NO. 248.4-00 UL 248-4 4AUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION O

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31、be announced through either a CSA Informs or CSA Certication Notice. UL Effective Date This edition of the standard is now in effect. AUGUST 11, 2005 NMX-J-009/248/4-2000-ANCE CAN/CSA-C22.2 NO. 248.4-00 UL 248-4 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT

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34、AL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Low-Voltage Fuses Part 4: Class CC 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

35、 of the Clauses in this Part corresponds to like numbered Clauses in Part 1. The requirements of Part 1 apply unless modied by this Part. For Clauses not shown below, refer to the Standard for Low-Voltage Fuses Part 1: General Requirements, NMX-J-009/248/4-2000-ANCE CAN/CSA C22.2 No. 248.1 UL 248-1.

36、 1.1 Scope This Part applies to Class CC fuses rated 30 A or less and 600 V ac. DC ratings are optional. 4 Classication Class CC fuses are non-renewable and current limiting, with an interrupting rating of 200,000 A. Class CC fuses have one body size. Time-delay ratings are optional. 5 Characteristi

37、cs 5.2 Voltage rating For AC, the rating shall be 600 V ac. For DC, the voltage rating may be different from the AC rating. 5.3 Current rating 30 A or less. 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. AUGUST 11, 2

38、005 NMX-J-009/248/4-2000-ANCE CAN/CSA-C22.2 NO. 248.4-00 UL 248-4 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.6 Peak let-through current and clearing I 2 t characteristics Maximum values of peak let-through current and clearing I 2 t

39、are given in Table A. Table A Maximum peak let-through current and clearing I 2 t for Class CC fuses Current rating I n ,A Between threshold and 50 kA At 100 kA At 200 kA Peak let- through current, A I 2 t, ampere- squared seconds Peak let- through current, A I 2 t, ampere- squared seconds Peak let-

40、 through current, A I 2 t, ampere- squared seconds 0 15 3,000 2,000 3,000 2,000 4,000 3,000 16 20 3,000 2,000 4,000 3,000 5,000 3,000 21 30 6,000 7,000 7,500 7,000 12,000 7,000 7 Construction 7.1 Dimensions Fuse dimensions are shown in Figure A. This is generated text for gtxt. 8 Tests Figure A Dime

41、nsions of Class CC fuses in mm (in) Current rating I n , A Overall length Ferrule length Ferrule diameter Rejection length Rejection diameter A a B b C b K b M b 38.10 9.53 10.29 3.18 6.35 0 30 (1.500) (0.375) (0.405) (0.125) (0.250) a Tolerances: 0.79 mm (0.031 in). b Tolerances: 0.13 mm (0.005 in)

42、. AUGUST 1, 2000 NMX-J-009/248/4-2000-ANCE CSA C22.2 NO. 248.4-00 UL 248-4 10UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 8.2 Verication of temperature rise and current-carrying capacity 1.0 I n Temperature rise 1.1 I n Current-carrying c

43、apacity, I nf 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 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.

44、2.4 Acceptability of test results The maximum temperature rise shall not exceed the following: Contacts 75C; 8.3 Verication of overload operation Part 1, Table 4 Test 1 1.35 I n Test 3 2.0 I n Test 4 2.0 I n for time-delay fuses only (can be combined with Test 3). 8.4 Verication of operation at rate

45、d voltage 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 4a 100 kA Test 4b 50 kA Test 5b2I n Peak let-through current and clearing I 2 t recorded during Tests 1, 4a, and 4b. DC (optional) Part 1, Table 6 Test 1 Interruptin

46、g rating Test 2 Maximum energy AUGUST 11, 2005 NMX-J-009/248/4-2000-ANCE CSA C22.2 NO. 248.4-00 UL 248-4 11UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Test 5a 9.0 I n for time-delay fuses only Test 5c2I n 8.5 Verication of peak let-throu

47、gh current and clearing I 2 t characteristics 8.5.3 Acceptability of test results In addition to the requirements in Part 1: Peak let-through current and clearing I 2 t values recorded shall not exceed the limits specied in Clause 5.6. AUGUST 1, 2000 NMX-J-009/248/4-2000-ANCE CSA C22.2 NO. 248.4-00 UL 248-4 12