UL 248-7-2000 UL Standard for Safety Low-Voltage Fuses C Part 7 Class H Renewable Fuses (Second Edition Reprint with Revisions Through and Including February 9 2015)《低压熔断器 第7部分 H级可.pdf

1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 248-7 Low-Voltage Fuses Part 7: Class H Renewable FusesUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT A

2、UTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Low-Voltage Fuses Part 7: Class H Renewable Fuses, UL 248-7 Second Edition, Dated August 1, 2000 Summary of Topics This revision of ANSI/UL 248-7 is being issued to reaffirm approval as an Americ

3、an National Standard. No changes in requirements are involved. 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 system, or t

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8、cept 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 preceded by a SUPE

9、RSEDED REQUIREMENTS notice. FEBRUARY 9, 2015 UL 248-7 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 9, 2015 UL 248-7 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOU

10、T PERMISSION FROM UL Low-Voltage Fuses Part 7: Class H Renewable Fuses August 1, 2000 (Title Page Reprinted: February 9, 2015) Canadian Standards Association CAN/CSA-C22.2 No. 248.7-00 Second Edition Approved by Underwriters Laboratories Inc. UL 248-7 Second Edition ANSI/UL 248-7-2005 (R2015) Nation

11、al Association of Standardization and Certication of the Electrical Sector NMX-J-009/248/7-2000-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

12、 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

13、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

14、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 1-55324-238-6 Copyright 2000 CSA Group All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission o

15、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

16、terrupting rating 10 6 Marking .10 6.1 Marking of fuses 10 7 Construction .10 7.1 Dimensions .10 8 Tests .13 8.1 General 13 8.2 Verication of temperature rise and current-carrying capacity .13 8.3 Verication of overload operation 14 8.4 Verication of operation at rated voltage .14 AUGUST 11, 2005 NM

17、X-J-009/248/7-2000-ANCE CAN/CSA-C22.2 NO. 248.7-00 UL 248-7 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Preface This is the common UL, CSA, and ANCE Standard for Low-Voltage Fuses Part 7: Class H Renewable Fuses. This is the second edit

18、ion of CAN/CSA-C22.2 No. 248.7-00 (superseding the rst edition, published in 1996), the second edition of UL 248-7, and the rst edition of NMX-J-009/248/7-2000-ANCE. This Standard was prepared by a Technical Harmonization Committee comprised of members from Underwriters Laboratories, CSA Internation

19、al, 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 Committee are gratefully acknowledged. The present Mexican Standard was developed by

20、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 Subcommittee on Fuses and approved by the Technical Committee on Industrial Products unde

21、r 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 Standard. This ANSI/UL Standard for Safety consists of the Second Edition including revisi

22、ons through February 9, 2015. The most recent designation of ANSI/UL 248-7 as a Reaffirmed American National Standard (ANS) occurred on February 9, 2015. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page (front and back), or the Preface. Comments or proposal

23、s 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 purchase UL Standards, visit Comm 2000 at http:/m- or call toll-free 1-888-853-3503. Not

24、e: 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 Ide

25、ntical 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. Interpretations The interpretation by the SDO (Standards Development Organization) of an id

26、entical 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, a revision shall be proposed as soon as possible to each of the SDOs to more accura

27、tely reect the intent. FEBRUARY 9, 2015 NMX-J-009/248/7-2000-ANCE CAN/CSA-C22.2 NO. 248.7-00 UL 248-7 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL ANCE Effective Date The effective date for ANCE will be announced through the Diario Ocial

28、 de la Federation (Official Gazette) and is indicated on the cover page. AUGUST 2, 2010 NMX-J-009/248/7-2000-ANCE CAN/CSA-C22.2 NO. 248.7-00 UL 248-7 4AUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 2, 2010 NMX-J-009/248/7-2000-ANCE

29、CAN/CSA-C22.2 NO. 248.7-00 UL 248-7 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 be announced through CSA Informs or CSA Certication Notice. UL Effective Date This

30、edition of the standard is now in effect. AUGUST 11, 2005 NMX-J-009/248/7-2000-ANCE CAN/CSA-C22.2 NO. 248.7-00 UL 248-7 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL This page intentionally left blank. AUGUST 11, 2005 NMX-J-009/248/7-2000

31、-ANCE CAN/CSA-C22.2 NO. 248.7-00 UL 248-7 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL This page intentionally left blank. AUGUST 11, 2005 NMX-J-009/248/7-2000-ANCE CAN/CSA-C22.2 NO. 248.7-00 UL 248-7 7UL COPYRIGHTED MATERIAL NOT AUTHORI

32、ZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL This page intentionally left blank. AUGUST 11, 2005 NMX-J-009/248/7-2000-ANCE CAN/CSA-C22.2 NO. 248.7-00 UL 248-7 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Low-Vo

33、ltage Fuses Part 7: Class H Renewable 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 Clauses in this Part correspond to like numbered Clauses in Part 1. The req

34、uirements 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-009/248/7-2000-ANCE CAN/CSA C22.2 No. 248.1 UL 248-1. 1.1 Scope This Part applies to Class H Renewable fuses rated 600 A or less and eith

35、er 250 or 600 V ac. DC ratings are optional. 4 Classication Class H Renewable fuses have an interrupting rating of 10,000 A. Each of the voltage ratings, 250 V ac and 600 V ac, is divided into six body sizes with the maximum current rating, I n , for each size as specied in this Part. These fuses ar

36、e not classied as current limiting. Time-delay ratings are optional. These fuses may be restored to service after operation by the replacement of the renewal element with one recommended by the manufacturer. 5 Characteristics 5.2 Voltage rating For AC, the rating shall be 250 or 600 V ac in accordan

37、ce with dimensions shown in Figures A and B. The DC voltage rating may be different from the AC rating. 5.3 Current rating Refer to Figures A and B for range of current ratings in each body size for each voltage rating. AUGUST 11, 2005 NMX-J-009/248/7-2000-ANCE CAN/CSA-C22.2 NO. 248.7-00 UL 248-7 9U

38、L COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.5 Interrupting rating For AC 10,000 A For DC 10,000 A 6 Marking 6.1 Marking of fuses In addition to the requirements in Part 1: The fuse shall be marked Renewable and with the recommended rene

39、wal element. Each renewal element shall be marked in accordance with Part 1, Clause 6.1, Items a, b, and c. g) The fuse shall not be marked Current Limiting. 7 Construction 7.1 Dimensions Fuse dimensions are shown in Figures A and B. This is generated text for gtxt. AUGUST 1, 2000 NMX-J-009/248/7-20

40、00-ANCE CSA C22.2 NO. 248.7-00 UL 248-7 10UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL This is generated text for gtxt. Figure A Dimensions of ferrule type Class H Renewable fuses in mm (in) Note: The end caps shall be capable of being re

41、moved by a tool, e.g. a screwdriver or pliers. Rating Overall length of fuse Minimum length of ferrule Outside diameter of ferrule Volts Current I n ,A A a BC b 250 0 30 50.8 12.7 14.3 (2.00) (0.50) (0.56) 31 60 76.2 15.9 20.6 (3.00) (0.62) (0.81) 600 0 30 127.0 15.9 20.6 (5.00) (0.62) (0.81) 31 60

42、139.7 15.9 27.0 (5.50) (0.62) (1.06) a Tolerance: 0.79 mm ( 0.031 in). b Tolerance: 0.20 mm ( 0.008 in). AUGUST 11, 2005 NMX-J-009/248/7-2000-ANCE CSA C22.2 NO. 248.7-00 UL 248-7 11UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Figure B Dim

43、ensions of knife blade type Class H Renewable fuses in mm (in) Rating Overall length of fuse Minimum length of blade Minimum overall length of cylindrical body Minimum distance from mid- point of fuse to nearest live part Thickness of blade Width of blade Maximum dimension of cap including projectio

44、ns Volts Current I n ,A A a B b C c D d E e F f G 250 61 100 149.2 25.4 85.7 26.2 3.18 19.05 19.1 (5.88) (1.00) (3.38) (1.03) (0.125) (0.750) (0.75) 101 200 181.0 34.9 104.8 30.2 4.76 28.58 25.4 (7.12) (1.38) (4.12) (1.19) (0.188) (1.125) (1.00) 201 400 219.1 47.6 117.5 30.2 6.35 41.28 31.8 (8.62) (

45、1.88) (4.62) (1.19) (0.250) (1.625) (1.25) 401 600 263.5 57.2 131.8 38.9 6.35 50.80 38.1 (10.38) (2.25) (5.19) (1.53) (0.250) (2.000) (1.50) 600 61 100 200.0 25.4 136.5 44.4 3.18 19.05 22.2 (7.87) (1.00) (5.38) (1.75) (0.125) (0.750) (0.87) 101 200 244.5 34.9 155.5 57.2 4.76 28.58 28.6 (9.62) (1.38)

46、 (6.12) (2.25) (0.188) (1.125) (1.13) 201 400 295.3 47.6 181.0 63.5 6.35 41.28 38.1 (11.62) (1.88) (7.12) (2.50) (0.250) (1.625) (1.50) 401 600 339.7 57.2 208.0 68.3 6.35 50.80 44.5 (13.38) (2.25) (8.18) (2.69) (0.250) (2.000) (1.75) a Tolerances: 61 200 A, 1.57 mm ( 0.062 in); 201 600 A, 2.39 mm (

47、0.094 in). b One blade shall not be more than 1.57 mm (0.062 in) longer than the other blade. The effective length of the blade is measured from the blade end to the fuse body or other acceptable interference means in the blade, such as pins through the blades, a collar, or the like. c The length of

48、 the cylindrical body may be less than the indicated value if other acceptable interference means such as pins through the blades or collars are provided to prevent mounting the fuse in a fuseholder that will accommodate a fuse rated in the next lower bracket of current ratings. d The minimum distan

49、ce from midpoint of fuse to nearest live part may be reduced to 12.7 mm (0.50 in) minimum if the fuse is constructed so that phase-to-phase and phase-to-ground spacings in end-use equipment are maintained. e Tolerance: 0.08 mm ( 0.003 in). f Tolerance: 0.89 mm ( 0.035 in). AUGUST 11, 2005 NMX-J-009/248/7-2000-ANCE CSA C22.2 NO. 248.7-00