1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirelyvoluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefro
2、m, is the sole responsibility of the user.”SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions.TO PLACE A DOCUMENT ORDER: +1 (724) 776-4970 FAX: +1 (724) 776-0790SAE WEB ADDRESS http:
3、/www.sae.orgCopyright 2002 Society of Automotive Engineers, Inc.All rights reserved. Printed in U.S.A.SURFACEVEHICLE400 Commonwealth Drive, Warrendale, PA 15096-0001RECOMMENDEDPRACTICEJ2576ISSUEDAPR2002Issued 2002-04Blade Fuses - 42 V SystemForewordThis SAE Recommended Practice has been developed by
4、: the Circuit Protection Task Force of theCircuit Protection and Switching Devices Committee. The objectives of the task force are to develop informationreports, recommended practices, and standards concerned with the requirements, design, and testing of circuitprotection components such as fuses, c
5、ircuit breakers, or other devices of similar purpose that are intended foruse in the electrical systems of vehicles.This document is intended as a guide toward the adoption of standard practices and is subject to change so as tokeep pace with experience and technical advances.TABLE OF CONTENTS1. Sco
6、pe . 22. References . 22.1 Applicable Documents 22.1.1 SAE Publications 22.1.2 ASTM Publications . 22.1.3 ISO Publications . 22.2 Related Publications . 32.2.1 SAE Publication 32.2.2 ISO Publication. 33. Definitions. 34. Test Requirements . 74.1 Test Equipment and Instrumentation 74.2 General Condit
7、ions. 104.3 Sample Sizes . 105. Test Procedures . 105.1 Electrical Testing 105.2 Mechanical and Environmental Testing 116. Performance Requirements 136.1 Electrical Test Requirements 136.2 Mechanical and Environmental Test Requirements. 14SAE J2576 Issued APR2002-2-7. General Requirements147.1 Desig
8、n Parameters . 147.2 Marking and Identification . 157.3 Testing Safety and Operational Advisory . 158. Test Sequence Chart 16Figure 1 Miniature Class Blade Fuse 4Figure 2 Standard Class Blade Fuse5Figure 3 Time Lag Class Blade Fuse6Figure 4 Miniature Class Blade Fuse Test Slug 7Figure 5 Standard Cla
9、ss Blade Fuse Test Slug8FIgure 6 Time Lag Class Blade Fuse Test Slug .9Figure 7 Transient Cycling Test Duty Cycle Format .11Figure 8 Blade Strength Test (Axis Orientation) . 12Figure 9 Test Sequence Chart 16Appendix A Example of Test Fixture Design 17Figure A1 Test Fixture Component Reference Drawin
10、g181. ScopeThis SAE Recommended Practice defines the blade fuse styles, test conditions, procedures, andperformance requirements for use in vehicle electrical power systems designed to the new motor vehicleindustry 42 V architecture. The intent of this document is to provide a framework for 58 V Bla
11、de Fusecharacteristics, serving the motor vehicle industry to establish standardization with respect to electricalperformance and mechanical requirements. This standardization shall lend itself to safe application practices;e.g., prevention of 32 V devices utilized inappropriately in 42 V electrical
12、 systems.Both the performance and mechanical requirements expressed herein are for the advancement of mobilityengineering and the development of safe application practices. They are not intended for the establishment ofdesign exclusions, patent rights, or franchising that engenders restraint of trad
13、e.2. References2.1 Applicable PublicationsThe following publications form a part of this specification to the extent specifiedherein. Unless otherwise specified, the latest issue of SAE publications shall apply.2.1.1 SAE PUBLICATIONSAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-00
14、01SAE J1034Engine Coolant Concentrate - Ethylene-Glycol TypeSAE J1284Blade Type Electric FusesSAE J1888High Current Time Lag Electric FusesSAE J2077Miniature Blade Type Electrical Fuses2.1.2 ASTM P UBLICATIONS (OR REFERENCED PROPERTIES)Available from ASTM, 100 Barr Harbor Drive, WestConshohocken, PA
15、 19428-2959.ASTM B 117Method of Salt Spray (Fog) TestingASTM No. 3 Oil2.1.3 ISO DOCUMENTSAvailable from ANSI, 25 West 43rd Street, New York, NY 10036-8002.ISO 1817 No. 1 OilISO 8820-3Road vehiclesFusesPart 3: Fuse-links with tabs (blade-type)SAE J2576 Issued APR2002-3-2.2 Related PublicationsThe fol
16、lowing publications are provided for information purposes only and are not arequired part of this specification.2.2.1 SAE PUBLICATIONAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001SAE J726Air Cleaner Test Code2.2.2 ISO DOCUMENTAvailable from ANSI, 25 West 43rd Street, New York,
17、 NY 10036-8002.ISO 8820-1Road vehiclesFusesPart 1: Definitions and general test requirements3. Definitions3.1 FuseA device designed to interrupt the electrical circuit when subjected to over-current. This action is to benonreversible, and the fuse is intended for replacement after the circuit malfun
18、ction has been corrected.3.2 Fuse HolderAn electro-mechanical assembly capable of accepting or otherwise providing termination to afuse device and providing termination capability to an electrical power source.3.3 Insulator BodyAn electrically non-conductive housing (e.g., plastic) that provides a s
19、upporting frameworkfor the conductive sections of the fuse assembly. May provide in supplemental fashion, a mechanical designform to facilitate keying or other interface relationship with a fuse holder or other power distribution moduleassembly, which would serve to distinguish a 58 V fuse from a 32
20、 V fuse.3.4 Fuse ElementThe section of the fuse conductive path that is by design the most susceptible area tooverload current conditions and when subjected to overload current in sufficient amount and duration,becomes disrupted effectively interrupting the current path to a non-conducting state. A
21、58 V fuse element willprovide for safe interruption of current under all conditions of overload.3.5 Terminal The terminal is that part of the fuse construction that makes the electro-mechanical conductiveconnection for the fuse assembly to its respective fuse holder device. The terminals are those p
22、ortions of thefuse extending from the insulator body on the respective fuse type footprint centerline.3.6 Rated CurrentThe rated current is the maximum continuous current the fuse is capable of passing for theminimum specified time as shown in the test procedures and performance requirements. It als
23、o serves toidentify the fuse nominal rated current value. While being a performance and identification value, end useapplications and circuit design factors may necessitate a continuous current rating less than the fuse ratedcurrent value.3.7 Rated VoltageThe rated voltage is the maximum voltage for
24、 which the fuse is designed. For this document,the rated voltage is 58 V. Rated voltage is not necessarily the same as operating voltage, which typically is lessthan the rated voltage in a vehicular electrical system. Rated voltage allows for the periodic voltage rise ortransient voltage spikes that
25、 occur in vehicular electrical systems.3.8 Voltage DropThe voltage drop is the voltage measured across the fuse circuit path passing the full ratedcurrent after specified time duration and under specific conditions of test.3.9 Breaking CapacityThe breaking capacity is a value of the respective fault
26、 current that a fuse (fuse element)is capable of interrupting in accordance with a specific test condition and performance criteria.3.10 Time/Current CharacteristicsThe relation of time for a fuse to operate (open) in proportion to a specific testcurrent, typically expressed in graphical form to rel
27、ate a time/current curve.SAE J2576 Issued APR2002-4-3.11 Operating TimesAn expression of time duration in minimum and maximum terms to indicate when a fuseshould operate (open) at a specified value of current in excess of the rated current.3.12 Miniature Class Blade FuseIndicates a 58 V rated fuse t
28、hat generally corresponds to the class of fuseidentified in SAE J2077 as a miniature blade type electrical fuse, however, it is mechanically coded to preventthe 32 V miniature blade type fuse from being interchanged in a 58 V application. Figure 1 depicts this class offuse basic format without mecha
29、nical coding provision incorporated.FIGURE 1MINIATURE CLASS BLADE FUSESAE J2576 Issued APR2002-5-3.13 Standard Class Blade FuseIndicates a 58 V rated fuse that generally corresponds to the class of fuseidentified in SAE J1284 as a blade type electrical fuse, however, it is mechanically coded to prev
30、ent the 32 Vversion blade type fuse from being interchanged in a 58 V application. The term “standard” in this context issolely intended to indicate that this fuse size is the first and oldest in the family of blade fuses to gain wide useand acceptance in the automotive industry. Figure 2 depicts th
31、is class of fuse basic format without mechanicalcoding provision incorporated.FIGURE 2STANDARD CLASS BLADE FUSESAE J2576 Issued APR2002-6-3.14 Time Lag Class Blade FuseIndicates a 58 V rated fuse that generally corresponds to the class of fuseidentified in SAE J1888 as a high current time lag blade
32、type electrical fuse, however, it is mechanically codedto prevent the 32 V high current time lag blade type fuse from being interchanged in a 58 V application. Figure3 depicts this class of fuse basic format without mechanical coding provision incorporated.FIGURE 3TIME LAG CLASS BLADE FUSESAE J2576
33、Issued APR2002-7-4. Test Requirements4.1 Test Equipment and Instrumentation4.1.1 POWER SUPPLYA regulated DC output power supply capable of delivering the current levels required for alltests shall be used. The supply voltage shall not exceed 58 V DC, have ripple not to exceed 0.5 V, and atime consta
34、nt of 2 ms or less.4.1.2 FUSE TEST SLUGSVerification of correct setup with the test holder shall require the use of test slugsconstructed of silver plated copper alloy CA110 per the dimensions of Figures 4, 5, and 6.FIGURE 4MINIATURE CLASS BLADE FUSE TEST SLUGSAE J2576 Issued APR2002-8-FIGURE 5STAND
35、ARD CLASS BLADE FUSE TEST SLUGSAE J2576 Issued APR2002-9-FIGURE 6TIME LAG CLASS BLADE FUSE TEST SLUG4.1.3 CONNECTING CABLES FOR ELECTRICAL TESTSConnecting cables shall be of multiple stranded copperconductor design. The cable sizes are listed in Table 1.TABLE 1WIRE SIZES FOR TESTSRated Current(Amps)
36、Cross-Sectional Area(mm2) SAE Wire Size1A thru 10 A 0.35 2215 A 0.50 2020 A 0.75 0.80 1825 A 1.0 1630 A 2.0 2.5 1435 A 40 A 3.0 4.0 1250 A 60 A 5.0 6.0 10SAE J2576 Issued APR2002-10-4.2 General Conditions4.2.1 Unless otherwise specified, tests are performed in still air at a room ambient environment
37、 of 23 C 3 C.4.2.2 Fuses that have been subjected to environmental testing where they are not installed in a test holder as partof the test and require post-environmental electrical testing shall have the terminal blades cleanedsufficiently to ensure proper electrical interface with the test holder.
38、4.2.3 TEST HOLDER SETUP INSTRUCTIONSFuses shall be mounted horizontally unless otherwise noted. Whentesting two or more fuses in series, the fuses shall be mounted no less than 150 mm apart and with no lessthan 600 mm of interconnecting cable, unless otherwise noted. All electrical tests shall be ma
39、de withmatched wire size, as shown in Table 1 and a standardized test module as shown in Appendix A. Theinterface voltage drop (VCD VAB) of the fixture shall not exceed 15 mv per terminal (30 mV total). Thevoltage check shall be made using the test slugs as referred to in 4.1.2.4.3 Sample SizesTest
40、sub-groups shall comply with the Test Sequence Chart shown in Section 8.5. Test Procedures5.1 Electrical Testing5.1.1 VOLTAGE DROPUsing the test holder and sample requirement from Test Sequence Chart, apply 100% ofrated current to the fuse under test and after 15 minutes elapsed time record the volt
41、age drop. Repeat for allfuses in each amperage sample group. See Figures 1, 2, 3, and note.NOTE Measurement points are located on the fuse terminals at a centered distance from the bottomdatum of the fuse body (1.5 mm) for all classes of fuse covered by this document.5.1.2 ISOLATION RESISTANCEAfter
42、a fuse sample group has been subjected to an over-current during a test andthe current path interrupted, the open-circuit resistance between the fuse terminals (blades) shall bemeasured using an appropriate volt/ohmmeter that is capable of performing the measurement at fuse ratedvoltage.5.1.3 TIME/C
43、URRENT CHARACTERISTICSUsing the test holder and sample requirement from Test Sequence Chartfor each level of test current required, apply current to the fuse under test per Table 2 and record the elapsedtime for the fuse to interrupt the current. Repeat for all fuses in each amperage sample group.NO
44、TE 100% and 110% tests are terminated after 100 hours of continuous operation assuming the fuseunder test has not interrupted current flow. 100% and 110% tests may be performed at anyconvenient voltage up to rated voltage. All other tests to be performed at rated voltage. 5.1.4 BREAKING CAPACITYUsin
45、g the test holder and sample requirement from Test Sequence Chart for each fuserated current, apply a test current of 1000 +5/0% A with a rise time of 2.5 ms 0.5 ms at 58 V DC +5%/0%V. Hold voltage for 30 s after interrupt.TABLE 2TIME/CURRENT TEST LEVELSMiniature andStandard Class Time Lag Class110%
46、 In 100% In135% In 135% In200% In 200% In350% In 350% In600% In 600% InSAE J2576 Issued APR2002-11-5.1.5 TRANSIENT CYCLINGUsing the test holder and sample requirement from Test Sequence Chart, subject thefuses to a peak current at 460% to 500% of rated current for fuse ratings 5 A or less and 540% t
47、o 600% forfuses over 5 A in rating using the pulse cycle curve shown in Figure 7. This test shall be performed for a totalof 50 000 cycles. 5.2 Mechanical and Environmental Tests5.2.1 VIBRATIONUsing the sample requirement from the Test Sequence Chart, the fuses shall be placed in asuitable test fixt
48、ure and subjected to a simple harmonic motion having amplitude of 0.75 mm (1.5 mm totalexcursion). The frequency shall be varied uniformly between the limits of 10 Hz to 55 Hz. The entire range of10 Hz to 55 Hz shall be traversed in approximately 1 minute. The motion shall be applied for a period of
49、2hours in each of three mutually perpendicular planes for a total elapsed time of 6 hours. Vibration testing isperformed without electrical current being passed through the fuses.FIGURE 7TRANSIENT CYCLING TEST DUTY CYCLE FORMATSAE J2576 Issued APR2002-12-5.2.2 STRENGTH OF B LADE FUSE TERMINALSUsing a suitable holding fixture for the test (refer to Figure 8) andsample requirement from the Test Sequence Chart, apply both push and pull forces to the fuse terminals inthe directions shown by Figure 8 and with t
