1、Low-Voltage Fuses Part 3: Class CA and CB FusesAugust 1, 2000CSA InternationalCSA C22.2 No. 248.3-00Second EditionUnderwriters LaboratoriesInc.UL 248-3Second EditionNational Association ofStandardization andCertification of the ElectricalSectorNMX-J-009/248/3-2000-ANCEFirst EditionCommitment for Ame
2、ndmentsThis Standard is issued jointly by the National Association of Standardization andCertification of the Electrical Sector (ANCE), CSA International, and UnderwritersLaboratories Incorporated (UL). Amendments to this Standard will be made onlyafter processing according to the Standards writing
3、procedures by ANCE, CSA,and UL.Revisions of this Standard will be made by issuing revised or additional pagesbearing their date of issue. A UL Standard is current only if it incorporates themost recently adopted revisions, all of which are itemized on the transmittal noticethat accompanies the lates
4、t set of revised requirements.Copyright 2000ANCERights reserved in favorof ANCEISBN 1-55324-230-0Copyright 2000CSA InternationalAll rights reserved. Nopart of this publicationmay be reproduced inany form whatsoeverwithout the priorpermission of thepublisher.ISBN 0-7629-0553-0Copyright 1996,2000Under
5、writersLaboratories Inc.Update No. 3CAN/CSA-C22.2 No. 248.3-00August 2005Note: General Instructions for CSA Standards are now called Updates. Please contact CSA Information Products Sales or visit www.ShopCSA.ca for information about the CSA Standards Update Service.Title: Low-Voltage Fuses Part 3:
6、Class CA and CB Fuses originally published August 2000Revisions issued: Update No. 2 November 2004If you are missing any updates, please contact CSA Information Products Sales or visit www.ShopCSA.ca.The following revisions have been formally approved and are marked by a vertical line in the margin
7、on the attached replacement pages:Revised Title page, copyright page, Contents, Preface, and Clauses 1 and 8.2.4New NoneDeleted Foreword (ANCE) and Foreword (UL)CAN/CSA-C22.2 No. 248.3-00 originally consisted of 14 pages, each dated August 2000. It now consists of the following pages:August 2000 101
8、2 and 14November 2004 CoverAugust 2005 19 and 13Update your copy by inserting these revised pages.Keep the pages you remove for reference.Low-Voltage Fuses Part 3: Class CA and CB FusesAugust 1, 2000(Title Page Reprinted: August 11, 2005)Canadian StandardsAssociationCAN/CSA-C22.2 No. 248.3-00Second
9、EditionUnderwriters LaboratoriesInc.UL 248-3Second EditionANSI/UL 248-3-2005National Association ofStandardization andCertification of the ElectricalSectorNMX-J-009/248/3-2000-ANCEFirst EditionCommitment for AmendmentsThis Standard is issued jointly by the National Association of Standardization and
10、Certification of the Electrical Sector (ANCE), CSA International, and UnderwritersLaboratories Incorporated (UL). Amendments to this Standard will be made onlyafter processing according to the Standards writing procedures by ANCE, CSA,and UL.Revisions of this Standard will be made by issuing revised
11、 or additional pagesbearing their date of issue. A UL Standard is current only if it incorporates themost recently adopted revisions, all of which are itemized on the transmittal noticethat accompanies the latest set of revised requirements.Copyright 2000,2005 ANCERights reserved in favorof ANCEISBN
12、 1-55324-230-0Copyright 2000Canadian StandardsAssociationAll rights reserved. Nopart of this publicationmay be reproduced inany form whatsoeverwithout the priorpermission of thepublisher.ISBN 0-7629-0553-0Copyright 1996,2005UnderwritersLaboratories Inc.CONTENTSPreface .41 General 91.1 Scope .94 Clas
13、sification .95 Characteristics 95.2 Voltage rating 95.3 Current rating 95.5 Interrupting rating 105.6 Peak let-through current and clearing I2t characteristics 107 Construction .107.1 Dimensions .108 Tests .128.2 Verification of temperature rise and current-carrying capacity .128.3 Verification of o
14、verload operation 138.4 Verification of operation at rated voltage .138.5 Verification of peak let-through current and clearing I2t characteristics .14AUGUST 11, 2005 NMX-J-009/248/3-2000-ANCE CAN/CSA-C22.2 NO. 248.3-00 UL 248-3 3PrefaceThis is the common UL, CSA, and ANCE Standard for Low-Voltage F
15、uses Part 3: Class CA and CBFuses. This is the second edition of CAN/CSA-C22.2 No. 248.3-00 (superseding the first edition,published in 1996), the second edition of UL 248-3, and the first edition of NMX-J-009/248/3-2000-ANCE.This Standard was prepared by a Technical Harmonization Committee comprise
16、d of members fromUnderwriters Laboratories, CSA International, the National Association of Standardization andCertification of the Electrical Sector, the end product manufacturers, and material suppliers. The effortsand support of the members of the Technical Harmonization Committee are gratefully a
17、cknowledged.The present Mexican Standard was developed by the TC 32 Fuses from the Comite de Normalizacion dela Asociacion de Normalizacion y Certificacion, A.C., CONANCE, with the collaboration of the fusemanufacturers and users.This Standard was reviewed by the CSA Subcommittee on Fuses and approv
18、ed by the TechnicalCommittee on Industrial Products under the jurisdiction of the CSA Strategic Steering Committee on theRequirements for Electrical Safety.This Standard has been approved by the American National Standards Institute (ANSI) as an AmericanNational Standard.The most recent designation
19、of ANSI/UL 248-3 as an American National Standard (ANSI) occurred onAugust 1, 2005.This ANSI/UL 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 propos
20、als 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 StandardsDevelopment System (CSDS) at http:/.Note: Although the intended primary application of this Standard is stated in its Scope, it
21、is important to note that it remains theresponsibility of the users of the Standard to judge its suitability for their particular purpose.Level of HarmonizationThis trinational standard is published as an Identical Standard. An identical standard is a standard that isthe same in technical content ex
22、cept for conflicts in Codes and Governmental Regulations. Presentationis word for word except for editorial changes.InterpretationsThe interpretation by the SDO (Standards Development Organization) of an identical standard shall bebased on the literal text to determine compliance with the standard i
23、n accordance with the proceduralrules of the SDO. If more than one interpretation of the literal text has been identified, a revision shall beproposed as soon as possible to each of the SDOs to more accurately reflect the intent.ANCE Effective DateThe effective date for ANCE will be announced throug
24、h the Diario Oficial de la Federation (OfficialGazette) and is indicated on the cover page.AUGUST 11, 2005NMX-J-009/248/3-2000-ANCE CAN/CSA-C22.2 NO. 248.3-00 UL 248-34CSA Effective DateThe effective date for CSA will be announced through CSA Informs or CSA Certification Notice.UL Effective DateThis
25、 edition of the standard is now in effect.AUGUST 11, 2005 NMX-J-009/248/3-2000-ANCE CAN/CSA-C22.2 NO. 248.3-00 UL 248-3 5This page intentionally left blank.AUGUST 11, 2005NMX-J-009/248/3-2000-ANCE CAN/CSA-C22.2 NO. 248.3-00 UL 248-36AUGUST 11, 2005 NMX-J-009/248/3-2000-ANCE CSA C22.2 NO. 248.3-00 UL
26、 248-3 7Foreword (CSA) The Canadian Standards Association (CSA) develops standards under the name Canadian StandardsAssociation, and provides certification and testing under the name CSA International. CSA Internationalprovides certification services for manufacturers who, under license from CSA, wi
27、sh to use the appropriateregistered CSA Marks on certain products of their manufacture to indicate conformity with CSA Standards. CSA Certification for a number of products is provided in the interest of maintaining agreed-uponstandards of quality, performance, interchangeability and/or safety, as a
28、ppropriate. Where applicable,certification may form the basis for acceptance by inspection authorities responsible for enforcement ofregulations. Where feasible, programs will be developed for additional products for which certification isdesired by producers, consumers, or other interests. In perfo
29、rming its functions in accordance with itsobjectives, CSA does not assume or undertake to discharge any responsibility of the manufacturer or anyother party. The opinions and findings of the Association represent its professional judgement given withdue consideration to the necessary limitations of
30、practical operation and state of the art at the time theStandard is processed. Products in substantial accord with this Standard but which exhibit a minor difference or a new feature maybe deemed to meet the Standard providing the feature or difference is found acceptable utilizingappropriate CSA In
31、ternational Operating Procedures. Products that comply with this Standard shall not becertified if they are found to have additional features which are inconsistent with the intent of this Standard.Products shall not be certifiable if they are discovered to contravene applicable laws or regulations.
32、 Testing techniques, test procedures, and instrumentation frequently must be prescribed by CSAInternational in addition to the technical requirements contained in Standards of CSA. In addition tomarkings specified in the Standard, CSA International may require special cautions, markings, andinstruct
33、ions that are not specified by the Standard. Some tests required by CSA Standards may be inherently hazardous. The Association neither assumesnor accepts any responsibility for any injury or damage that may occur during or as the result of tests,wherever performed, whether performed in whole or in p
34、art by the manufacturer or the Association, andwhether or not any equipment, facility, or personnel for or in connection with the test is furnished by themanufacturer or the Association. Manufacturers should note that, in the event of the failure of CSA International to resolve an issue arisingfrom
35、the interpretation of requirements, there is an appeal procedure: the complainant should submit thematter, in writing, to the Secretary of the Canadian Standards Association. If this Standard is to be used in obtaining CSA Certification please remember, when making application forcertification, to r
36、equest all current Amendments, Bulletins, Notices, and Technical Information Letters thatmay be applicable and for which there may be a nominal charge. For such information or for furtherinformation concerning CSA Certification, please address your inquiry to Applications and CustomerService, CSA In
37、ternational, 178 Rexdale Boulevard, Toronto, Ontario, Canada M9W 1R3. This page intentionally left blank.AUGUST 11, 2005NMX-J-009/248/3-2000-ANCE CAN/CSA-C22.2 NO. 248.3-00 UL 248-38Low-Voltage Fuses Part 3: Class CA and CB Fuses1 GeneralNOTE This Part is intended to be read together with the Standa
38、rd for Low-Voltage Fuses Part 1: General Requirements, hereafterreferred to as Part 1. The numbering of the Clauses in this Part correspond to like numbered Clauses in Part 1. The requirementsof Part 1 apply unless modified by this Part. For Clauses not shown below, refer to the Standard for Low-Vol
39、tage Fuses Part 1:General Requirements, NMX-J-009/248/3-2000-ANCE CAN/CSA C22.2 No. 248.1 UL 248-1.1.1 ScopeThis Part applies to Class CA and CB fuses rated 60 A or less and 600 V ac. DC ratings are optional.4 ClassificationClass CA and CB fuses are non-renewable and current limiting, with an interr
40、upting rating of 200,000 A.Class CA fuses have one body size. Class CB fuses are divided into two body sizes. The maximumcurrent rating, In, for each size is specified in this Part.5 Characteristics5.2 Voltage ratingFor AC, the rating shall be 600 V ac.The DC voltage rating may be different from the
41、 AC rating.5.3 Current ratingClass CA fuses shall be rated 30 A or less.Class CB fuses shall be rated 60 A or less. Refer to Figure B for range of current ratings in each bodysize.AUGUST 11, 2005 NMX-J-009/248/3-2000-ANCE CAN/CSA-C22.2 NO. 248.3-00 UL 248-3 95.5 Interrupting ratingFor AC 200,000 AFo
42、r DC, the preferred ratings are 10,000, 20,000, 50,000, 100,000, 150,000, or 200,000 A.5.6 Peak let-through current and clearing I2t characteristicsMaximum values of peak let-through current and clearing I2t are given in Table A.Table A Maximum peak let-through current and clearing I2t for Class CA
43、and CB fuses at 200kAClass and current rating In, Peak let-through current,I2t, ampere-squared secondsAAClass CA 8,000 6,000Class CB1 30 10,000 10,00031 60 15,000 60,0007 Construction7.1 DimensionsFuse dimensions are shown in Figures A and B.This is generated text for figtxt.AUGUST 1, 2000NMX-J-009/
44、248/3-2000-ANCE CSA C22.2 NO. 248.3-00 UL 248-3108.2.3.1 Fuses rated 600 A or lessIn addition to the requirements in Part 1: At the conclusion of the temperature rise test, the test currentshall be increased without interruption to 1.1 Infor a period of not less than 15 min. Temperature is notto be
45、monitored during this time.8.2.4 Acceptability of test resultsIn addition to the requirements in Part 1: The maximum temperature rise shall not exceed the following:Contacts 75C8.3 Verification of overload operationPart 1, Table 4Test 1 1.35 InTest 3 2.0 In8.4 Verification of operation at rated volt
46、ageFor AC Part 1, Table 5Test 1 200 kATest 2 Maximum energyTest 3 Threshold ratio. The maximum threshold ratio shall be 60.Test 5b2InPeak let-through current and clearing I2t recorded during Test 1.For DC Part 1, Table 6Test 1 Interrupting ratingTest 2 Maximum energyTest 5c2InAUGUST 11, 2005 NMX-J-0
47、09/248/3-2000-ANCE CSA C22.2 NO. 248.3-00 UL 248-3 138.5 Verification of peak let-through current and clearing I2t characteristics8.5.3 Acceptability of test resultsPeak let-through current and clearing I2t values recorded shall not exceed the limits specified in Table A.AUGUST 1, 2000NMX-J-009/248/
48、3-2000-ANCE CSA C22.2 NO. 248.3-00 UL 248-314Update No. 2 C22.2 No. 248.3-00 November 2004 Note: General Instructions for CSA Standards are now called Updates. Please contact CSA Information Products Sales or visit www.ShopCSA.ca for information about the CSA Standards Update Service. Title: Low-Vol
49、tage Fuses Part 3: Class CA and CB Fuses originally published August 2000 The following revisions have been formally approved: Revised Outside front cover, inside front cover, and title page New None Deleted None CSA C22.2 No. 248.3-00 originally consisted of 16 pages each dated August 2000. It now consists of the following pages: August 2000 316 November 2004 Cover, title page, and copyright page Update your copy by inserting these revised pages. Keep the pages you rem
