1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 248-5 Low-Voltage Fuses Part 5: Class G 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 5: Class G Fuses, UL 248-5 Second Edition, Dated August 1, 2000 Summary of Topics This revision of ANSI/UL 248-5 is being issued to reaffirm approval as an American National Standard
3、. 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 January 5, 2015 will not be jointly issued by UL,
4、 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. All rights reserved. No part of this publication may be reproduced, stored in a retrieval
5、 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 without warranty of any kind, either expressed or implied, including but not limited to, the implied warranties of merchantab
6、ility or tness for any purpose. In no event will UL be liable for any special, incidental, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or any other damages arising out of the use of or the inability to use this Standard, even if UL or an authorize
7、d 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 of the form of the claim. Users of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold
8、UL harmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. The requirements in this Standard are now
9、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 for requirements that have been revised and that have a future effective date are located after the Standard, and are prece
10、ded by a SUPERSEDED REQUIREMENTS notice. JANUARY 5, 2015 UL 248-5 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JANUARY 5, 2015 UL 248-5 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBU
11、TION WITHOUT PERMISSION FROM UL Low-Voltage Fuses Part 5: Class G Fuses August 1, 2000 (Title Page Reprinted: January 5, 2015) Canadian Standards Association CAN/CSA-C22.2 No. 248.5-00 Second Edition Approved by Underwriters Laboratories Inc. UL 248-5 Second Edition ANSI/UL 248-5-2005 (R2015) Nation
12、al Association of Standardization and Certication of the Electrical Sector NMX-J-009/248/5-2000-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 Association of
13、 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 will be m
14、ade 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 new edi
15、tion 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 1-55324-234-3 Copyright 2000 CSA Group All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission o
16、f the publisher. Copyright 2015 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 5.5 In
17、terrupting rating .9 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 temperature rise and current-carrying capacity .12 8.3 Verication of overload operation 12 8.4 Verication of operation at rated voltage .12 8.5
18、Verication of peak let-through current and clearing I 2 t characteristics .13 AUGUST 11, 2005 NMX-J-009/248/5-2000-ANCE CAN/CSA-C22.2 NO. 248.5-00 UL 248-5 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Preface This is the common UL, CSA,
19、and ANCE Standard for Low-Voltage Fuses Part 5: Class G Fuses. This is the second edition of CAN/CSA-C22.2 No. 248.5-00 (superseding the rst edition, published in 1996), the second edition of UL 248-5, and the rst edition of NMX-J-009/248/5-2000-ANCE. This Standard was prepared by a Technical Harmon
20、ization 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 Harmonization
21、 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 CSA Sub
22、committee 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 National Stan
23、dard. This ANSI/UL Standard for Safety consists of the Second Edition including revisions through January 5, 2015. The most recent designation of ANSI/UL 248-5 as a Reaffirmed American National Standard (ANS) occurred on January 5, 2015. ANSI approval for a standard does not include the Cover Page,
24、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 at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. To purc
25、hase 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 stated 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 particu
26、lar purpose. Level of Harmonization This trinational standard is published as an Identical Standard. An identical standard is a standard that is the same in technical content except for conicts in Codes and Governmental Regulations. Presentation is word for word except for editorial changes. Interpr
27、etations The interpretation by the SDO (Standards Development Organization) of an identical standard shall be based on the literal text to determine compliance with the standard in accordance with the procedural rules of the SDO. If more than one interpretation of the literal text has been identied,
28、 a revision shall be proposed as soon as possible to each of the SDOs to more accurately reect the intent. JANUARY 5, 2015 NMX-J-009/248/5-2000-ANCE CAN/CSA-C22.2 NO. 248.5-00 UL 248-5 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL ANCE Ef
29、fective Date The effective date for ANCE will be announced through theDiario Ocial de la Federation (Official Gazette) and is indicated on the cover page. AUGUST 2, 2010 NMX-J-009/248/5-2000-ANCE CAN/CSA-C22.2 NO. 248.5-00 UL 248-5 4AUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR
30、 DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 2, 2010 NMX-J-009/248/5-2000-ANCE CAN/CSA-C22.2 NO. 248.5-00 UL 248-5 4B No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CSA Effective Date The effective date for CSA will b
31、e 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-009/248/5-2000-ANCE CAN/CSA-C22.2 NO. 248.5-00 UL 248-5 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSIO
32、N FROM UL This page intentionally left blank. AUGUST 11, 2005 NMX-J-009/248/5-2000-ANCE CAN/CSA-C22.2 NO. 248.5-00 UL 248-5 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL This page intentionally left blank. AUGUST 11, 2005 NMX-J-009/248/5-
33、2000-ANCE CAN/CSA-C22.2 NO. 248.5-00 UL 248-5 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL This page intentionally left blank. AUGUST 11, 2005 NMX-J-009/248/5-2000-ANCE CAN/CSA-C22.2 NO. 248.5-00 UL 248-5 8UL COPYRIGHTED MATERIAL NOT AUT
34、HORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Low-Voltage Fuses Part 5: Class G 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 Cla
35、uses in this Part correspond 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-009/248/5-2000-ANCE CAN/CSA C22.2 No. 248.1 UL 248-1. 1.1 Scope T
36、his Part applies to Class G fuses rated 20 A or less, 600 V ac; 21 60 A, 480 V ac. DC ratings are optional. 4 Classication Class G fuses are non-renewable and current limiting, with an interrupting rating of 100,000 A. Class G fuses are divided into four body sizes. The maximum current rating, I n ,
37、 for each size is specied in this Part. Time-delay ratings are optional. 5 Characteristics 5.2 Voltage rating For AC, the rating shall be 600 V ac for the02 0Abody sizes, and 480 V ac for the 21 60 A body sizes. The DC voltage rating may be different from the AC rating. 5.3 Current rating Refer to F
38、igure A for range of current ratings in each body size. 5.5 Interrupting rating For AC 100,000 A For DC, the preferred ratings are 10,000, 20,000, 50,000, or 100,000 A. AUGUST 11, 2005 NMX-J-009/248/5-2000-ANCE CAN/CSA-C22.2 NO. 248.5-00 UL 248-5 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER R
39、EPRODUCTION 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 at 100,000 A are given in Table A. Table A Maximum peak let-through current and clearing I 2 t for Class G fuses Curren
40、t rating I n , A Peak let-through current, A I 2 t, ampere-squared seconds 1 1,000 800 3 1,500 1,200 6 2,000 1,800 10 3,000 2,800 15 4,000 3,800 20 5,000 5,000 25 6,000 6,000 30 7,000 7,000 35 8,000 14,000 40 8,500 17,000 45 9,000 18,500 50 9,500 21,000 60 10,500 25,000 7 Construction 7.1 Dimensions
41、 Fuse dimensions are shown in Figure A. This is generated text for gtxt. AUGUST 1, 2000 NMX-J-009/248/5-2000-ANCE CSA C22.2 NO. 248.5-00 UL 248-5 10UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Figure A Dimensions of Class G fuses in mm (i
42、n) Current rating I n ,A Overall length of fuse Minimum length of ferrule Outside diameter of ferrule A a BC b 0 15 33.3 7.1 10.3 (1.31) (0.28) (0.41) 16 20 35.7 7.1 10.3 (1.41) (0.28) (0.41) 21 30 41.3 7.1 10.3 (1.62) (0.28) (0.41) 31 60 57.2 12.7 10.3 (2.25) (0.50) (0.41) a Tolerance: 0.8 mm ( 0.0
43、3 in) b Tolerance: 0.15 mm ( 0.006 in) AUGUST 1, 2000 NMX-J-009/248/5-2000-ANCE CSA C22.2 NO. 248.5-00 UL 248-5 11UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 8 Tests 8.2 Verication of temperature rise and current-carrying capacity 8.2.3
44、Test Method 1.0 I n Temperature rise 1.1 I n Current-carrying capacity, 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
45、15 min. Temperature is not to be monitored during this time. 8.2.4 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 T e s t32I n T e s t42I n for time delay only (can be combin
46、ed with Test 3) 8.4 Verication of operation at rated voltage For AC Part 1, Table 5 Test 2 Maximum energy Test 3 Threshold ratio. The maximum threshold ratio shall be 60. Test 4a 100 kA Test 5b2I n Peak let-through current and clearing I 2 t recorded during Test 4a. For DC Part 1, Table 6 Test 1 Int
47、errupting rating Test 2 Maximum energy AUGUST 11, 2005 NMX-J-009/248/5-2000-ANCE CSA C22.2 NO. 248.5-00 UL 248-5 12UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Test 5a9I n for time delay only Test 5c2I n 8.5 Verication of peak let-through
48、 current and clearing I 2 t characteristics 8.5.3 Acceptability of test results Peak let-through current and clearing I 2 t values recorded shall not exceed the limits specied in Table A. AUGUST 1, 2000 NMX-J-009/248/5-2000-ANCE CSA C22.2 NO. 248.5-00 UL 248-5 13UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 1, 2000 NMX-J-009/248/5-2000-ANCE CSA C22.2 NO. 248.5-00 UL 248-5 14 No Text on This Page
