1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 4248-12 Fuseholders Part 12: Class R STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT
2、AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Fuseholders Part 12: Class R, UL 4248-12 Second Edition, Dated January 19, 2018 Summary of Topics The Second Edition of the Standard for Safety for Fuseholders Part 12: Class R, UL 4248-12, has
3、been issued to reect the latest ANSI approval date and to incorporate the following proposal. Correction to dummy fuse dimensions. The revised requirements are substantially in accordance with Proposal(s) on this subject dated August 4, 2017. All rights reserved. No part of this publication may be r
4、eproduced, 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 without warranty of any kind, either expressed or implied, including but not limited to, the
5、implied warranties of merchantability 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 Stan
6、dard, 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. Users of the electronic versions of ULs Standards for Safety agree
7、 to defend, indemnify, and hold 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. JANUARY 19
8、, 2018 UL 4248-12 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JANUARY 19, 2018 UL 4248-12 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Association o
9、f Standardization and Certication NMX-J-009-4248-12-ANCE Second Edition CSA Group CAN/CSA-C22.2 No. 4248.12-18 Second Edition Underwriters Laboratories Inc. UL 4248-12 Second Edition Fuseholders Part 12: Class R January 19, 2018 ANSI/UL 4248-12-2018UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER
10、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 proposal
11、s 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 mea
12、ns 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 2018 ANCE Rights reserved in favor of ANCE. ISBN 978-1-4883-1159-8 2018
13、CSA Group All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission of the publisher. This Standard is subject to review within ve years from the date of publication, and suggestions for its improvement will be referred to the appropriate
14、committee. To submit a proposal for change, please send the following information to inquirescsagroup.org and include Proposal for change in the subject line: Standard designation (number); relevant clause, table, and/or gure number; wording of the proposed change; and rationale for the change. To p
15、urchase CSA Group Standards and related publications, visit CSA Groups Online Store at shop.csa.ca or call toll-free 1-800-463-6727 or 416-747-4044. Copyright 2018 Underwriters Laboratories Inc. To purchase UL Standards, visit COMM 2000 at http:/m- or call toll free 18888533503. This ANSI/UL Standar
16、d for Safety consists of the Second Edition. The most recent designation of ANSI/UL 4248-12 as an American National Standard (ANSI) occurred on January 19, 2018. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page (front and back), or the Preface. Comments or
17、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 https:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic c
18、opy of a Standard 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.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONT
19、ENTS PREFACE 4 1 General 5 1.1 Scope .5 4 Classication .5 5 Characteristics 5 5.1 Summary of characteristics 5 6 Marking 5 6.1 Marking of fuseholder .5 7 Construction 5 7.6 Contacts of a cartridge fuseholder 5 8 Tests 8 8.1 General .8 8.4 Verication of temperature rise .9 8.6A Verication of effectiv
20、eness of rejection member .11 8.6A.2 Acceptability of test results 11 JANUARY 19, 2018 NMX-J-009-4248-12-ANCE CAN/CSA-C22.2 NO. 4248.12-18 UL 4248-12 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PREFACE This is the harmonized ANCE, CSA G
21、roup, and UL standard for Fuseholders - Part 12: Class R. It is the second edition of NMX-J-009-4248-12-ANCE, the second edition of CAN/CSA-C22.2 No. 4248-12, and the second edition of UL 4248-12. This edition of CAN/CSA-C22.2 No. 4248-12 supersedes the previous edition published on February 28, 200
22、7. This edition of UL 4248-12 supersedes the previous edition published on February 28, 2007. This harmonized standard was prepared by the Association of Standardization and Certication, (ANCE), CSA Group and Underwriters Laboratories Inc. (UL). The efforts and support of the Technical Harmonization
23、 Subcommittee, CANENA Technical Harmonization Subcommittee 32B Low Voltage Fuses on the Harmonization of Electrotechnical Standards of the Nations of the Americas (CANENA), are gratefully acknowledged. are gratefully appreciated. This standard is considered suitable for use for conformity assessment
24、 within the stated scope of the standard. This standard was reviewed by the CSA Subcommittee on Fuses and Fuseholders, under the jurisdiction of the CSA Technical Committee on Industrial Products and the CSA Strategic Steering Committee on Requirements for Electrical Safety, and has been formally ap
25、proved by the CSA Technical Committee. This standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group. This standard has been approved by the American National Standard
26、s Institute (ANSI) as an American National Standard. Application of Standard Where reference is made to a specic number of samples to be tested, the specied number is to be considered a minimum quantity. Note: Although the intended primary application of this standard is stated in its scope, it is i
27、mportant 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 standard is published as an identical standard for ANCE, CSA Group, and UL. An identical standard is a standard that is exactly the same
28、 in technical content except for national differences resulting from conicts in codes and governmental regulations. Presentation is word for word except for editorial changes. Interpretations The interpretation by the standards development organization of an identical or equivalent standard is based
29、 on the literal text to determine compliance with the standard in accordance with the procedural rules of the standards development organization. If more than one interpretation of the literal text has been identied, a revision is to be proposed as soon as possible to each of the standards developme
30、nt organizations to more accurately reect the intent. JANUARY 19, 2018 NMX-J-009-4248-12-ANCE CAN/CSA-C22.2 NO. 4248.12-18 UL 4248-12 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Fuseholders Part 12: Class R 1 General This Part is intend
31、ed to be read together with the Standard for Fuseholders Part 1: General Requirements, hereafter referred to as Part 1. The numbering 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,
32、refer to the Standard for Fuseholders Part 1: General Requirements, NMX-J-009-4248-ANCE CSA C22.2 No. 4248.1 UL 4248-1. 1.1 Scope 1.1.2 These requirements cover fuseholders intended for use with Class R Fuses as described in NMX-J-009/248/12-2000-ANCE, CSA C22.2 No. 248.12, UL 248-12, Low-Voltage Fu
33、ses Part 12: Class R Fuses. 4 Classication 4.1 Class R fuseholders have a short-circuit withstand rating of 200,000 A. Class R fuseholders are rated 250 V or 600 V, and are divided into six body sizes in each voltage rating corresponding to the Class R fuse body sizes. 5 Characteristics 5.1 Summary
34、of characteristics 5.1.3 Voltage and current rating 5.1.3.1 Class R fuseholders shall be rated 250 V or 600 V. 5.1.3.2 Class R fuseholders shall be rated 30, 60, 100, 200, 400, or 600 A. 5.1.4 Withstand rating 5.1.4.1 Class R fuseholders shall have a short-circuit withstand rating of 200,000 A. 6 Ma
35、rking 6.1 Marking of fuseholder 6.1.1.1 In addition to the requirements of Part 1, the fuseholder shall be marked Use Class R Fuses. 7 Construction 7.6 Contacts of a cartridge fuseholder 7.6.1 The dimensions of a Class R fuseholder shall be as specied in Figure 7.6A or 7.6B, whichever is applicable.
36、 Class R fuseholders shall be provided with a rejection member to prevent the installation of fuses of other classes. JANUARY 19, 2018 NMX-J-009-4248-12-ANCE CAN/CSA-C22.2 NO. 4248.12-18 UL 4248-12 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FR
37、OM UL This is generated text for gtxt. Figure 7.6A Class R fuseholder, Ferrule contact type with rejection member Tabs shown are a typical end-stop conguration. Class of fuse Potential rating of fuse, volts Current rating of fuse, amperes Dimensions, mm (in) BCDE Distance a between contact clips Min
38、imum width of contact clip Diameter of ferrule Thickness of blade R 250 30 25.4 (1.0) 12.7 (0.5) 14.27 (0.562) 60 44.45 (0.750) 15.88 (0.625) 20.62 (0.812) 100 101.6 (4.0) 22.22 (0.437) 3.18 (0.125) 200 114.3 (4.5) 31.75 (1.250) 4.75 (0.187) 400 127.0 (5.0) 44.44 (1.750) 6.35 (0.250) 600 152.4 (6.0)
39、 53.97 (2.062) 6.35 (0.250) 600 30 101.6 (4.0) 12.7 (0.5) 20.62 (0.812) 60 107.95 (0.250) 15.88 (0.625) 26.97 (1.062) 100 152.4 (6.0) 22.22 (0.875) 3.18 (0.125) 200 177.8 (7.0) 31.75 (1.250) 4.75 (0.187) 400 203.2 (8.0) 44.44 (1.750) 6.35 (0.250) 600 228.6 (9.0) 53.97 (2.062) 6.35 (0.250) NOTE See F
40、igure 7.6B for dimensions G, H, J, K, L, M, N, and I. a Tolerances for the B dimensions are: 60 A or less: plus 0.79 mm (0.031 in) and minus 1.57 mm (0.062 in); 100 and 200 amperes: plus 1.57 mm (0.062 in) and minus 0.79 mm (0.031 in); 400 and 600 amperes: plus 2.36 mm (0.093 in). JANUARY 19, 2018 N
41、MX-J-009-4248-12-ANCE CAN/CSA-C22.2 NO. 4248.12-18 UL 4248-12 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Figure 7.6B Class R fuseholder, Blade type with rejection member JANUARY 19, 2018 NMX-J-009-4248-12-ANCE CAN/CSA-C22.2 NO. 4248.12
42、-18 UL 4248-12 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Figure 7.6B continued Class of fuse Potential rating of fuse, volts Current rating of fuse, amperes Dimensions, mm (in) GHJK a L b MN c I Minimum distance from center of rejecti
43、on member to end stop Maximum distance from center of rejection member to end stop Maximum width of rejection member Contact above rejection member Extension of rejection member from inside surface of clip Maximum distance frm end of rejection member to end stop Rejection member opening Minimum/ max
44、imum distance to center rejection member R 250 30 48.1 (1.892) 4.19 (0.165) 1.65 (0.065) 2.03 (0.080) 48.41 (1.906) 10.29 (0.405) 60 72.6 (2.860) 4.98 (0.196) 2.06 (0.081) 2.03 (0.080) 73.81 (2.906) 16.64 (0.655) 100 6.48 (0.255) 7.14 (0.281) 10.92/12.29 (0.430/0.484) 200 6.48 (0.255) 11.91 (0.469)
45、15.7/17.07 (0.6108/0.672) 400 9.65 (0.380) 16.66 (0.655) 22.07/23.44 (0.869/0.923) 600 12.83 (0.505) 19.84 (0.781) 26.82/28.19 (1.056/1.110) 600 30 123 (4.860) 4.98 (0.196) 2.06 (0.081) 2.032 (0.080) 124.61 (4.906) 16.64 (0.655) 60 134.6 (5.298) 6.6 (0.260) 2.06 (0.081) 2.03 (0.080) 137.31 (5.406) 2
46、2.99 (0.905) 100 6.48 (0.255) 7.14 (0.281) 10.92/12.29 (0.430/0.484) 200 6.48 (0.255) 11.91 (0.469) 15.7/17.07 (0.618/ 0.672) 400 9.65 (0.380) 16.66 (0.656) 22.07/23.44 (0.869/0.923) 600 12.83 (0.505) 19.84 (0.781) 26.82/28.19 (1.056/1.110) NOTE See Figure 7.6A for dimensions B, C, D and E. a Column
47、 K tolerance: + 0.79 mm (0.031 in), dimension E multiplied by 0.5. b Column L tolerance: 0.41 mm (0.016 in), +0.000. c Column N tolerance: 0.000, +1.52 mm (0.060 in). 8 Tests 8.1 General 8.1.1 Types of tests 8.1.1.1.1 Each fuseholder shall be subjected to the tests as specied in Part 1, with the add
48、ition of the following: e) verication of effectiveness of rejection member. JANUARY 19, 2018 NMX-J-009-4248-12-ANCE CAN/CSA-C22.2 NO. 4248.12-18 UL 4248-12 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 8.4 Verication of temperature rise 8
49、.4.3 Test method 8.4.3.1 With dummy fuses in place and carrying rated current continuously, the temperature on a material or component or electrical insulation shall not exceed the values in Table 8.4B. 8.4.3.2 Dummy fuses shall be unplated copper and shall conform to the dimensions in Table 8.4A. 8.4.3.3 The
