1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 4248-12 Fuseholders Part 12: Class RUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTH
2、ER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Fuseholders Part 12: Class R, UL 4248-12 First Edition, Dated February 28, 2007 Summary of Topics This revision to ANSI/UL 4248-12 is being issued to update the UL approval date per a UL Standards reaffirmation of
3、ANSI/UL 4248-12, NMX-J-009/4248/12-ANCE, and CSA C22.2 No. 4248.12-07. 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 syst
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9、y a SUPERSEDED REQUIREMENTS notice. DECEMBER 21, 2012 UL 4248-12 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 21, 2012 UL 4248-12 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTR
10、IBUTION WITHOUT PERMISSION FROM UL Association of Standardization and Certication NMX-J-009/4248/12-ANCE First Edition CSA Group CSA C22.2 No. 4248.12-07 First Edition Underwriters Laboratories Inc. UL 4248-12 First Edition Fuseholders Part 12: Class R February 28, 2007 (Title Page Reprinted: Decemb
11、er 21, 2012) ANSI/UL 4248-12-2007 (R2012)UL 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 Standardization and Certication (ANCE), the Canadian Standards Associati
12、on (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 any time. Revisions to this standard will be made only after processing according to the standards development procedu
13、res 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 edition of the standard bearing the same date of issue as the CSA Group and
14、 UL pages. Copyright 2007 ANCE Rights reserved in favor of ANCE. ISBN 1-55436-049-8 2007 CSA Group All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission of the publisher. To purchase the CSA Group Standards and related publications, vi
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17、m- or call toll free 18888533503. This ANSI/UL Standard for Safety consists of the First Edition including revisions through December 21, 2012. The most recent designation of ANSI/UL 4248-12 as a Reaffirmed American National Standard (ANS) occurred on December 21, 2012. ANSI approval for a standard
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20、COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS Preface .4 1 General 6 1.1 Scope .6 4 Classication .6 5 Characteristics 6 5.1 Summary of characteristics 6 6 Marking 6 6.1 Marking of fuseholder .6 7 Construction 6 7.6 Contacts of a cart
21、ridge fuseholder 6 8 Tests 9 8.1 General .9 8.4 Verication of temperature rise 10 8.6A Verication of effectiveness of rejection member .12 8.6A.2 Acceptability of test results 12 FEBRUARY 28, 2007 NMX-J-009/4248/12-ANCE CSA C22.2 NO. 4248.12-07 UL 4248-12 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR
22、FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Preface This is the common ANCE, CSA Group, and UL standard for Fuseholders Part 12: Class R. It is the rst edition of NMX-J-009/4248/12-ANCE, the rst edition of CSA C22.2 No. 4248-12, and the rst edition of UL 4248-12. This common stan
23、dard was prepared by the Association of Standardization and Certication (ANCE), CSA Group, and Underwriters Laboratories Inc. (UL). The efforts and support of the CANENA Technical Harmonization Subcommittee 32B Fuseholders are gratefully appreciated. This standard is considered suitable for use for
24、conformity assessment within the stated scope of the standard. This standard was reviewed by the CSA Subcommittee on Low voltage fuses, under the jurisdiction of the CSA Technical Committee on Industrial Products and the CSA Strategic Steering Committee on Requirements for Electrical Safety, and has
25、 been formally approved by the CSA Technical Committee. This standard will be submitted to the Standards Council of Canada for approval as a National Standard of Canada. This standard has been approved by the American National Standards Institute (ANSI) as an American National Standard. A UL standar
26、d is current only if it incorporates the most recently adopted revisions, all of which are itemized on the transmittal notice that accompanies the latest set of revised requirements. Where reference is made to a specic number of samples to be tested, the specied number shall be considered a minimum
27、quantity. 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 standard is published as an id
28、entical standard for ANCE, CSA Group, and UL. An identical standard is a standard that is exactly the same 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 Th
29、e interpretation by the standards development organization of an identical or equivalent standard is based 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 t
30、ext has been identied, a revision is to be proposed as soon as possible to each of the standards development organizations to more accurately reect the intent. ANCE effective date The effective date for ANCE will be announced through the Diario Ocial de Ia Federacin (Official Gazette) and is indicat
31、ed on the cover page. DECEMBER 21, 2012 NMX-J-009/4248/12-ANCE CSA C22.2 NO. 4248.12-07 UL 4248-12 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CSA Group effective date The effective date for CSA Group will be announced through CSA Infor
32、ms or a CSA Group certication notice. UL effective date As of November 2, 2009 all products Listed or Recognized by UL must comply with the requirements in this standard. Between February 28, 2007 and November 2, 2009, new product submittals to UL may be evaluated under all requirements in this stan
33、dard or, if requested in writing, evaluated under presently effective requirements only. The presently effective requirements are contained in the tenth edition of UL 512. A UL effective date is one established by Underwriters Laboratories Inc. and is not part of the ANSI approved standard. DECEMBER
34、 21, 2012 NMX-J-009/4248/12-ANCE CSA C22.2 NO. 4248.12-07 UL 4248-12 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Fuseholders Part 12: Class R 1 General This Part is intended to be read together with the Standard for Fuseholders Part 1:
35、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, refer to the Standard for Fuseholders Part 1: General Requirement
36、s, 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 Fuses Part 12: Class R Fuses. 4 Classication 4.1 Class R fuseholder
37、s 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 of characteristics 5.1.3 Voltage and current rating 5.1.3.1 Class
38、 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 a 200,000 A. 6 Marking 6.1 Marking of fuseholder 6.1.1.1 In addition to the requ
39、irements 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. Class R fuseholders shall be provided with a rejection member
40、 to prevent the installation of fuses of other classes. FEBRUARY 28, 2007 NMX-J-009/4248/12-ANCE CSA C22.2 NO. 4248.12-07 UL 4248-12 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL This is generated text for gtxt. Figure 7.6A Class R fuseho
41、lder, 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 Minimum width of contact clip Diameter of ferrule Thickness of blade
42、 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) 53.97 (2.062) 6.35 (0.250) 600 30 101.6 (4.0) 12.7 (0.5) 20.62 (
43、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 Figure 7.6B for dimensions G, H, J, K, L, M, N, and I. a Tolerance
44、s 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). FEBRUARY 28, 2007 NMX-J-009/4248/12-ANCE CSA C22.2 NO. 4248.12-07 UL 4248-12 7UL CO
45、PYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Figure 7.6B Class R fuseholder, Blade type with rejection member FEBRUARY 28, 2007 NMX-J-009/4248/12-ANCE CSA C22.2 NO. 4248.12-07 UL 4248-12 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPR
46、ODUCTION 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 rejection member to end stop Maximum distance from center of rejection member
47、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/ maximum distance to center rejection member R 250 30 48.1 (1.892) 4.19 (0.
48、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) 15.7/17.07 (0.6108/0.672) 400 9.65 (0.380) 16.66 (0.655) 22.07/23.44 (0
49、.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 1135 (5.298) 6.6 (0.260) 2.06 (0.081) 2.03 (0.080) 137.31 (5.406) 22.99 (0.905) 100 6.48 (0.255) 7.14 (0.281) 10.92/12.29 (0.430/0.484) 200 6.48 (0.255) 11.9
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