UL 4248-12-2018 UL Standard for Safety Fuseholders C Part 12 Class R (Second Edition).pdf

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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

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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

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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

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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