《UL-248-3-2005.pdf》由会员分享，可在线阅读，更多相关《UL-248-3-2005.pdf（20页珍藏版）》请在三一文库上搜索。
1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 248-3 ISBN 0-7629-0553-0 Low-Voltage Fuses Part 3: Class CA and CB Fuses UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL -,-,- UL C
2、OPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Underwriters Laboratories Inc. (UL) 333 Pfi ngsten Road Northbrook, IL 60062-2096 UL Standard for Safety for Low-Voltage Fuses Part 3: Class CA and CB Fuses, UL 248-3 Second Edition, Dated August 1
3、, 2000 Revisions: This Standard contains revisions through and including August 11, 2005. Summary of Topics This revision for ANSI/UL 248-3 includes revisions to the verifi cation of temperature rise and current-carrying capacity requirements. Text that has been changed in any manner is marked with
4、a vertical line in the margin. The revised requirements are substantially in accordance with ULs Bulletin(s) on this subject dated November 4, 2004. The bulletin(s) is now obsolete and may be discarded. The revisions dated August 11, 2005 include a reprinted title page (page1) for this Standard. As
5、indicated on the title page (page 1), this UL Standard for Safety is an American National Standard. Attention is directed to the note on the title page of this Standard outlining the procedures to be followed to retain the approved text of this ANSI/UL Standard. The UL Foreword is no longer located
6、within the UL Standard. For information concerning the use and application of the requirements contained in this Standard, the current version of the UL Foreword is located on ULStandardsInfoNet at: http:/ The master for this Standard at ULs Northbrook Office is the official document insofar as it r
7、elates to a UL service and the compliance of a product with respect to the requirements for that product and service, or if there are questions regarding the accuracy of this Standard. ULs Standards for Safety are copyrighted by UL. Neither a printed copy of a Standard, nor the distribution diskette
8、 for a Standard-on-Diskette and the fi le for the Standard on the distribution diskette should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. All rights reserved. No part of this pub
9、lication 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. Revisions of UL Standards for Safety are issued from time to time. A UL Standard for Safety is current only
10、if it incorporates the most recently adopted revisions. UL provides this Standard as is without warranty of any kind, either expressed or implied, including but not limited to, the implied warranties of merchantability or fi tness for any purpose. AUGUST 11, 2005 UL 248-3tr1 -,-,- UL COPYRIGHTED MAT
11、ERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL In no event will UL be liable for any special, incidental, consequential, indirect or similar damages, including loss of profi ts, lost savings, loss of data, or any other damages arising out of the use of or th
12、e 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 of the form of the claim. UL will attempt to answer support requ
13、ests concerning electronic versions of its Standards. However, this support service is offered on a reasonable efforts basis only, and UL may not be able to resolve every support request. UL supports the electronic versions of its Standards only if they are used under the conditions and operating sy
14、stems for which it is intended. ULs support policies may change from time-to-time without notifi cation. UL reserves the right to change the format, presentation, fi le types and formats, delivery methods and formats, and the like of both its printed and electronic Standards without prior notice. Pu
15、rchasers of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage, claim, or judgement (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storin
16、g an electronic Standard on the purchasers computer system. If a single-user version electronic Standard was purchased, one copy of this Standard may be stored on the hard disk of a single personal computer, or on a single LAN fi le-server or the permanent storage device of a multiple-user computer
17、in such a manner that this Standard may only be accessed by one user at a time and for which there is no possibility of multiple concurrent access. If a multiple-user version electronic Standard was purchased, one copy of the Standard may be stored on a single LAN fi le-server, or on the permanent s
18、torage device of a multiple-user computer, or on an Intranet server. The number of concurrent users shall not exceed the number of users authorized. Electronic Standards are intended for on-line use, such as for viewing the requirements of a Standard, conducting a word search, and the like. Only one
19、 copy of the Standard may be printed from each single-user version of an electronic Standard. Only one copy of the Standard may be printed for each authorized user of a multiple-user version of an electronic Standard. Because of differences in the computer/software/printer setup used by UL and those
20、 of electronic Standards purchasers, the printed copy obtained by a purchaser may not look exactly like the on-line screen view or the printed Standard. An employee of an organization purchasing a UL Standard can make a copy of the page or pages being viewed for their own fair and/or practical inter
21、nal use. The requirements in this Standard are now in effect, except for those paragraphs, sections, tables, fi 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 effect
22、ive date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. New product submittals made prior to a specifi ed future effective date will be judged under all of the requirements in this Standard including those requirements with a specifi ed future effective date, u
23、nless the applicant specifi cally requests that the product be judged under the current requirements. However, if the applicant elects this option, it should be noted that compliance with all the requirements in this Standard will be required as a condition of continued Listing, Recognition, and Fol
24、low-Up Services after the effective date, and understanding of this should be signifi ed in writing. Copyright 2005 Underwriters Laboratories Inc. AUGUST 11, 2005 UL 248-3tr2 UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL This Standard cons
25、ists of pages dated as shown in the following checklist: PageDate 1-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . August 11, 2005 10-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . August 1, 2000 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . August 11, 2005 14 . . . . . . . . . . .
27、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . August 1, 2000 AUGUST 11, 2005 UL 248-3tr3 -,-,- UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 11,
28、2005 UL 248-3tr4 No Text on This Page UL 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: August 11, 2005) Canadian Standards Association CAN/CSA-C22.2 No. 248
29、.3-00 Second Edition Underwriters Laboratories Inc. UL 248-3 Second Edition ANSI/UL 248-3-2005 National Association of Standardization and Certifi cation of the Electrical Sector NMX-J-009/248/3-2000-ANCE First Edition -,-,- UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBU
30、TION WITHOUT PERMISSION FROM UL Commitment for Amendments This Standard is issued jointly by the National Association of Standardization and Certifi cation of the Electrical Sector (ANCE), CSA International, and Underwriters Laboratories Incorporated (UL). Amendments to this Standard will be made on
31、ly after processing according to the Standards writing procedures by ANCE, CSA, and UL. Revisions of this Standard will be made by issuing revised or additional pages bearing their date of issue. A UL Standard is current only if it incorporates the most recently adopted revisions, all of which are i
32、temized on the transmittal notice that accompanies the latest set of revised requirements. Copyright 2000, 2005 ANCE Rights reserved in favor of ANCE ISBN 1-55324-230-0 Copyright 2000 Canadian Standards Association All rights reserved. No part of this publication may be reproduced in any form whatso
33、ever without the prior permission of the publisher. ISBN 0-7629-0553-0 Copyright 1996, 2005 Underwriters Laboratories Inc. -,-,- UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS Preface . . . . . . . . . . . . . . . . . . . . . . . .
34、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 1.1 Scope
35、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 4 Classifi cation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
36、. . . . . .9 5 Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 5.2 Voltage rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
37、 . . . . . . . . . . . . .9 5.3 Current rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 5.5 Interrupting rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
38、. . . . . . . . . . . . . .10 5.6 Peak let-through current and clearing I2t characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 7 Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
39、 . . . . .10 7.1 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 8 Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
40、. . . . . . . . . . . . . . .12 8.2 Verifi cation of temperature rise and current-carrying capacity . . . . . . . . . . . . . . . . . . . . . . .12 8.3 Verifi cation of overload operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 8.4 Verifi cat
41、ion of operation at rated voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 8.5 Verifi cation of peak let-through current and clearing I2t characteristics . . . . . . . . . . . . . . .14 AUGUST 11, 2005NMX-J-009/248/3-2000-ANCE CAN/CSA-C22.2 NO. 248.3-00 UL
42、248-33 UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Preface This is the common UL, CSA, and ANCE Standard forLow-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 fi rs
43、t edition, published in 1996), the second edition of UL 248-3, and the fi 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 an
44、d Certifi cation of the 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 Normalizacio
45、n de la Asociacion de Normalizacion y Certifi cacion, 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 Stee
46、ring Committee on the Requirements for Electrical Safety. This Standard has been approved by the American National Standards Institute (ANSI) as an American National Standard. The most recent designation of ANSI/UL 248-3 as an American National Standard (ANSI) occurred on August 1, 2005. This ANSI/U
47、L Standard for Safety, which consists of the Second edition with revisions through August 11, 2005, is under continuous maintenance, whereby each revision is ANSI approved upon publication. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals
48、should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. 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 particular 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 confl icts in Codes and Governmental Regulations. Prese