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.QUESTIONS REGARDING THIS DOCUMENT: (412) 772-8512 FAX: (412) 776-0243TO PLACE A DOCUMENT
3、 ORDER; (412) 776-4970 FAX: (412) 776-0790Copyright 1990 Society of Automotive Engineers, Inc.All rights reserved. Printed in U.S.A.SURFACEVEHICLE400 Commonwealth Drive, Warrendale, PA 15096-0001STANDARDSubmitted for recognition as an American National StandardJ1888ISSUEDNOV90Issued 1990-11HIGH CURR
4、ENT TIME LAG ELECTRIC FUSESForewordThis Document has not changed other than to put it into the new SAE Technical Standards BoardFormat.1. ScopeThe fuses shown in Figure 1 are for use in motor vehicles, boats, and trailers to protect electricalwiring. This SAE Standard is for the construction shown a
5、nd is not intended to restrict the design and use ofother configurations and materials capable of meeting the vehicle requirements.2. References2.1 Applicable PublicationsThe following publications form a part of this specification to the extent specifiedherein. The latest issue of SAE publications
6、shall apply.2.1.1 SAE PUBLICATIONSAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.SAE J1034Engine Coolant ConcentrateEthylene-Glycol TypeSAE J1128 JUN87Low Tension Primary Cable2.1.2 ASTM PUBLICATIONAvailable from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.AS
7、TM B 117Method of Salt Spray (Fog) Testing3. Definitions3.1 FuseA device designed to interrupt the electrical circuit when subjected to overcurrents. This action is to benonreversible, and the fuse is intended to be replaced after the circuit malfunction has been corrected.4. Part 1Design Parameters
8、4.1 MaterialsThe fuses shall have nonconductive bodies capable of withstanding vehicle environmentalconditions as set forth in this document. Terminals shall have a suitable finish which will assure corrosionprotection and satisfactory mechanical and electrical properties.4.2 ConstructionThe fuse sh
9、all consist of a terminal and element combination securely attached to anonconductive fuse body. Fuse terminals shall be exposed through the top portion of the fuse body to allow forinspection of the electrical continuity of the fuse while it is engaged in a fuseblock or fuseholder. Fuseelements sha
10、ll be visible through the body. Typical overall dimensions are shown in Figure 1.SAE J1888 Issued NOV90-2-FIGURE 1OVERALL FUSE DIMENSIONS4.3 Marking(Initially and After Environmental Exposure)Fuses shall be marked on the fuse body with theamperage, voltage rating, and manufacturers name or trademark
11、. In addition, the fuses shall be color codedas shown in Table 1. Markings shall be legible at the conclusion of all tests set forth in this document.SAE J1888 Issued NOV90-3-5. Part 2Performance Requirements5.1 Ampere RatingThis document covers ampere ratings up to and including 120 amps. Preferred
12、 ampereratings are shown in Table 1. These ratings were determined at 24 C ambient temperature using a testprocedure as detailed in 6.1 of this document.5.1.1 WIREThe wire construction determines the maximum ampere capacity for a particular circuit. Table 2shows various cable constructions and their
13、 matched fuse ampere rating. Other wire construction such asPVCs and matched fuse combinations may be developed.5.1.2 TEMPERATUREFigure 2 represents the typical ampere capacity change with respect to ambienttemperature. The use of fuses in ambient temperature beyond the limits shown is not recommend
14、ed.TABLE 1PREFERRED AMPERE RATINGS AND COLOR CODESAmpere Rating Color20 Yellow30 Green40 Amber50 Red60 Blue70 Tan80 Natural100 Violet120 PinkTABLE 2MATCHED CABLE GAUGEFuse Ampere RatingCable Gauge (mm2)20 1.0 multistrand30 2.0 multistrand40 3.0 multistrand50 5.0 multistrand60 5.0 multistrand70 8.0 m
15、ultistrand80 8.0 multistrand100 13.0 multistrand120 16.0 multistrandNOTEWire type is cross-link polyethylene (GLX) as described in SAE specification J1128(June, 1987).SAE J1888 Issued NOV90-4-FIGURE 2AMBIENT TEMPERATURE EFFECT ON AMPACITY (TYPICAL)SAE J1888 Issued NOV90-5-5.1.3 LOADINGIt is recommen
16、ded that the fuses not be loaded above 70 to 80% of their rerated ampere capacitybased on ambient temperature and the use of their matched cable size. In addition, it is furtherrecommended that actual performance be verified through testing experimentally in the vehicle.NOTE The specific ampere capa
17、city of a fuse is a function of the particular electrical system beingutilized. To aid in determining the actual capacity change, several factors should be consideredby the application engineer. These factors include ambient temperature, wire size, insulatingmaterial, and connecting clips.5.2 Voltag
18、e RatingFuses shall be capable of interrupting at any voltage up to and including 32 V.5.3 Maximum Voltage DropThe maximum voltage drop (in millivolts) at rated current across the fuse shall be asshown in Table 3.5.4 PerformanceTests shall be conducted within a temperature range of 24 C 5 C, which i
19、s considered roomambient within this specification.5.4.1 AMPERE RATING TESTSFuses shall carry 100% of rated current continuously for a minimum of 100 h.Opening times for 135%, 200%, 350%, and 600% of rated current are listed in Table 4.TABLE 3MAXIMUM VOLTAGE DROP OF FUSE AT RATED CURRENTFuse Rating
20、(Amps) Max. Voltage Drop (mV)20 12030 12040 12050 12060 13070 13080 130100 130120 130SAE J1888 Issued NOV90-6-5.4.2 INTERRUPTING CAPACITY TESTThe fuses shall be capable of interrupting 1000 + 5%/0 A at 32 + 5%/0 V D.C. with a circuit time constant up to 2.5 ms. After testing, the fuse body shall be
21、intact and no damageto the standard test module or the fuse such as to prevent removal of the fuse shall be allowed.5.4.3 CURRENT CYCLING TESTFuses shall meet the requirements of 5.4.1 after current cycling for a minimum of250 000 cycles (cf.; 6.3).5.4.4 TRANSIENT CURRENT CYCLINGFuses shall meet the
22、 requirements of 5.4.1 after a minimum of 50 000 cyclesof transient current cycling (cf.; 6.4).5.5 Vibration TestFuses shall meet the requirements of 5.4.1 after undergoing 6 h of vibration conditioning(cf.; 6.5).5.6 Environmental ExposureFuses shall meet the requirements of 5.4.1 after sequential e
23、xposure to dust andaccelerated aging conditioning or thermal aging and salt fog conditioning (cf.; 6.6).NOTE One set of samples are to be used for the dust and accelerated aging conditioning tests and aseparate set of samples should be used for the thermal aging and salt spray conditioning tests.5.7
24、 Fluid CompatibilityFuses shall meet the requirements of 5.4.1 after exposure to specified test fluids(cf.; 6.7).6. Part 3Test Procedures6.1 ProcedureThe fuses with the exceptions noted in the vibration and accelerated aging tests, shall bemounted horizontally. When testing two or more fuses in seri
25、es, the fuses shall be mounted no less than150 mm apart and with no less than 600 mm of interconnecting cable, except as noted for the transient currentTABLE 4OPENING TIMESMIN/MAX (SECONDS)Fuse Rating (Amps)Percent ofRated Current135%Percent ofRated Current200%Percent ofRated Current350%Percent ofRa
26、ted Current600%20A Min 60 4 0.7 0.15Max 1800 20 2.0 1.030A Min 60 6 1.0 0.2Max 1800 30 4.0 1.040A Min 60 8 1.4 0.2Max 1800 40 5.0 1.050A Min 60 10 1.7 0.2Max 1800 50 6.0 1.060A Min 60 15 2.0 0.2Max 1800 60 7.0 1.070A Min 60 4 0.2 0.04Max 3600 60 2.0 0.1580A Min 60 4 0.2 0.04Max 3600 60 2.0 0.15100A
27、Min 60 4 0.2 0.04Max 3600 60 2.0 0.15120A Min 60 4 0.2 0.04Max 3600 60 2.0 0.15The opening times shown are applicable to all ambients between 50 C and +130 C provided the fuse isrerated to the temperature in question in accordance with the manufacturers rerating curve.SAE J1888 Issued NOV90-7-cyclin
28、g test. All electrical tests shall be made with matched cable gauge, as shown in Table 2 and a standardtest module (shown in Figure 3). The interface voltage drop (VCDVAB) of the fixture shall not exceed 50 mV.The total voltage drop (VEF) should not exceed 100 mV. The voltage check shall be made usi
29、ng a solid copperdummy with silver plated terminals and with the dimensions as shown in Figure 4. The test current andmatched cable gauge are shown in Table 2.SAE J1888 Issued NOV90-8-FIGURE 3STANDARD TEST MODULESAE J1888 Issued NOV90-9-FIGURE 4TEST SLUG6.2 Voltage DropThe voltage drop (in millivolt
30、s) at rated current across the fuse shall be measured at theindicated points on the fuse terminals as shown in Figure 1 after 15 min of applied rated current.6.3 Current Cycling Test6.3.1 Resistors should be employed as load(s) to maintain the current to 68 to 72% of the fuse rating as shown inFigur
31、e 5.SAE J1888 Issued NOV90-10-FIGURE 5CURRENT CYCLING WAVEFORM6.3.2 The test system voltage can be any convenient voltage up to and including 32 V.6.4 Transient Current Cycling Test6.4.1 Simulated loads should be used to adjust the initial peak transient current to the percent of the fuse rating ass
32、hown in Figure 6 and the initial steady state current to 98 to 102% of the fuse rating.SAE J1888 Issued NOV90-11-FIGURE 6TRANSIENT CURRENT CYCLING WAVEFORMSAE J1888 Issued NOV90-12-6.4.2 The test system voltage can be any convenient voltage up to and including 32 V.6.4.3 A minimum of 300 mm of inter
33、connecting cable should be used between each standard test module.6.5 Vibration TestSuitably mounted samples shall be subjected to a simple harmonic motion having anamplitude of 0.75 mm (1.50 mm total excursion). The frequency shall be varied uniformly between the limits of10 to 55 Hz. The entire ra
34、nge of 10 to 55 to 10 Hz shall be traversed in approximately 1 min. The motion shallbe applied for a period of 2 h in each of three mutually perpendicular planes (total of 6 h). (Testing to beperformed without current passing through fuse.) 6.6 Environmental Exposure6.6.1 DUSTFuses shall be placed i
35、n a dust chamber, Figure 7, unmounted and lying on their side. The chambershall contain about 1 kg of coarse grade dust conforming to SAE J726a. The dust shall be agitated for 3 severy 20 min by compressed air. The air shall be free of oil and moisture, at a pressure of 5.6 kg/cm20.10 kg/cm2entering
36、 through an orifice 1.5 mm 1 mm in diameter. The total exposure time to dust shall be24 h. (Testing to be performed without current passing through fuse.)FIGURE 7DUST CHAMBER (TYPICAL)6.6.2 ACCELERATED AGINGA total of 15 cycles as follows: (Testing to be performed without current passingthrough fuse
37、.)SAE J1888 Issued NOV90-13-16 h at 95 to 99% relative humidity and 37 C 1 C2 h at 40 C 1 C2 h at 70 C 1 C4 h at room ambientNOTE Fuses shall be placed in the humidity chamber on a tray, Figure 8, with the blades down.Samples shall remain in the humidity chamber when testing cannot be completed in a
38、 24 hperiod, for example weekends. If more than one chamber is used the transfer time betweenchambers shall be 5 min or less.FIGURE 8TRAY (TYPICAL)6.6.3 THERMAL AGINGFuses shall be aged at 180 C for a total of 168 h. (Testing to be performed in the standardmodule without current passing through fuse
39、.)6.6.4 SALT FOGFuses shall be subjected to salt fog conditioning per ASTM B 117 for 48 continuous hours.(Testing to be performed in the standard model without current passing through fuse.)6.7 Fluid CompatibilityOne set of fuses shall be immersed in one of each of the test fluids at a temperature o
40、f24 C 5 C for 5 to 10 s. After immersion all liquid shall be drained from the fuses and the fuses shall be heataged at 120 C for 24 h. The test fluids are: ASTM #3 oil, reference fuel C, and SAE J1034 engine coolant.(Testing to be performed in the standard module without current passing through fuse
41、.)PREPARED BY THE SAE CIRCUIT PROTECTION AND SWITCHING DEVICESSTANDARDS TECHNICAL COMMITTEESAE J1888 Issued NOV90RationaleNot applicable.Relationship of SAE Standard to ISO StandardNot applicable.ApplicationThe fuses shown in Figure 1 are for use in motor vehicles, boats, and trailers to protect ele
42、ctricalwiring. This SAE Standard is for the construction shown and is not intended to restrict the design anduse of other configurations and materials capable of meeting the vehicle requirements.Reference SectionSAE J1034Engine Coolant ConcentrateEthylene-Glycol TypeSAE J1128 JUN87Low Tension Primary CableASTM B 117Method of Salt Spray (Fog) TestingDeveloped by the SAE Circuit Protection and Switching Devices Standards Committee
