1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSEPTEMBER 21, 20111SUBJECT 248-17OUTLINE OF INVESTIGATIONFORLow-Voltage Fuses Part 17: Class CF FusesISSUE NO. 2September 21, 2011Summary of TopicsThis first issue of the Outline of Investigation
2、 for Low-Voltage Fuses Part 17: Class CF Fuses, Subject 248-17, is to revise the table belowFigure A.COPYRIGHT 2011 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSEPTEMBER 21, 2011SUBJECT 248-172No Text on This
3、PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTS1 General 41.1 Scope .44 Classification .45 Characteristics 45.2 Voltage rating 45.3 Current rating 45.5 Interrupting rating .45.6 Peak let-through current and clearing I2t characteri
4、stics .57 Construction 67.1 Dimensions 68 Tests 88.2 Verification of temperature rise and current-carrying capacity 88.3 Verification of overload operation .88.4 Verification of operation at rated voltage .8SEPTEMBER 21, 2011 SUBJECT 248-17 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODU
5、CTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL1 GeneralNote: This Outline of Investigation is intended to be read together with the Standard for Low-Voltage Fuses Part 1: GeneralRequirements, UL 248-1, hereafter referred to as Part 1. The numbering of the Clauses in this Outline of Investigation co
6、rrespondsto like numbered Clauses in UL 248-1. The requirements of UL 248-1 apply unless modified by this Outline of Investigation. ForClauses not shown below, refer to the Standard for Standard for Low-Voltage Fuses Part 1: General Requirements, UL 248-1.1.1 ScopeThis Part applies to Class CF fuses
7、 rated 100 A or less and 600 V ac. DC ratings are optional.4 ClassificationClass CF fuses are non-renewable, current-limiting, and size-rejecting with an interrupting rating of200,000 A. Class CF fuses are divided into three body sizes with the maximum current rating In for eachsize specified in thi
8、s Part.Time-delay ratings are optional.5 Characteristics5.2 Voltage ratingFor AC, the rating shall be 600 V ac.The DC voltage rating may be different from the AC rating.5.3 Current ratingRefer to Figure A for range of current ratings in each body size.5.5 Interrupting ratingFor AC 200,000 A or 300,0
9、00 A at the manufacturers option.For DC, the preferred ratings are 10,000, 20,000, 50,000, 100,000, 150,000, or 200,000 A.SEPTEMBER 21, 2011SUBJECT 248-174UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL5.6 Peak let-through current and clearin
10、g I2t characteristicsMaximum values of peak let-through current and clearing I2t are given in Table A (see 8.5.3).Peak let-through currents shall not exceed the levels defined by the appropriate Let Through Functionspecified in Table A, as verified through measurement of peak let-through currents at
11、 50, 100, 200 and,if applicable, 300kA.Clearing I2t values recorded shall not exceed the limits specified in Table A as verified throughmeasurement of clearing I2t values at 50, 100, 200 and, if applicable, 300kA.Table AMaximum peak let-through current and clearing I2t for CF fusesCurrentrating In,A
12、Between thresholdand 50 kAAt 100 kA At 200 kA At 300 kAPeaklet-throughcurrent, AI2t,ampere-squaredsecondsPeaklet-throughcurrent, AI2t,ampere-squaredsecondsPeaklet-throughcurrent, AI2t,ampere-squaredsecondsPeaklet-throughcurrent, AI2t,ampere-squaredsecondsPeakLet-ThroughFunction1 1,000 8003 1,500 1,2
13、006 2,300 2,00010 3,300 3,00015 4,000 4,00020 5,000 5,00025 6,000 5,50030 6,000 7,000 7,500 7,000 12,000 7,000 18,500 8,400 Y =1E-07x2+0.015x +500035 7,500 12,00040 8,000 17,00045 8,500 18,00050 9,000 22,00060 8,000 30,000 10,000 30,000 16,000 30,000 24,367 36,000 Y =1E-07x2+0.02x +6666.770 11,500 5
14、0,00080 12,500 60,00090 13,500 75,000100 12,000 60,000 14,000 80,000 20,000 80,000 28,367 96,000 Y =1E-07x2+0.02x +10667SEPTEMBER 21, 2011 SUBJECT 248-17 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL7 Construction7.1 DimensionsFuse dimensi
15、ons are shown in Figure A.This is generated text for figtxt.SEPTEMBER 21, 2011SUBJECT 248-176UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULFigure ADimensions of Class CF fuses in mm (in)Fuse AmpacityDIM (in) Tolerance 1A15A 17.5A20A25A30A 35
16、A40A 45A50A 60A 70A 80A90A 100AA 0.005 1.750 1.750 1.750 2.000 2.000 2.000 2.882 2.882 2.882B 0.005 1.000 1.000 1.000 1.125 1.125 1.125 1.260 1.260 1.260C 0.005 0.750 0.750 0.750 1.000 1.000 1.000 1.000 1.000 1.000D 0.005 0.667 0.667 0.667 0.667 0.667 0.667 0.645 0.645 0.645E 0.005 0.040 0.040 0.040
17、 0.040 0.040 0.040 0.063 0.063 0.063F 0.005 0.160 0.160 0.160 0.160 0.160 0.160 0.220 0.220 0.220G 0.005 0.080 0.080 0.080 0.090 0.090 0.090 0.090 0.090 0.090H 0.005 0.200 0.200 0.200 0.290 0.290 0.290 0.290 0.290 0.290I 0.005 0.580 0.580 0.580 0.790 0.790 0.790 0.790 0.790 0.790J 0.005 0.300 0.300
18、0.300 0.300 0.300 0.300 0.300 0.300 0.300K 0.005 0.458 0.458 0.458 0.465 0.465 0.465 0.533 0.533 0.533L 0.005 0.580 0.580 0.580 0.580 0.580 0.580 0.790 0.790 0.790M1 0.002 0.115 0.156 0.156 0.179 0.219 0.219 0.245 0.285 0.285M2 0.002 0.115 0.115 0.156 0.179 0.179 0.219 0.245 0.245 0.285N1 0.002 0.11
19、5 0.115 0.156 0.179 0.179 0.219 0.245 0.285 0.285N2 0.002 0.115 0.156 0.156 0.179 0.219 0.219 0.245 0.245 0.285P 0.002 0.156 0.156 0.156 0.156 0.156 0.156 0.173 0.173 0.173SEPTEMBER 21, 2011 SUBJECT 248-17 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMIS
20、SION FROM UL8 Tests8.2 Verification of temperature rise and current-carrying capacityIn Temperature riseIn Current carrying capacity, Inf8.2.3.1 In addition to the requirements of Part 1. At the conclusion of the temperature rise test, the testcurrent shall be increased without interruption to 1.1 I
21、nfor a period of not less than 15 min. Temperatureis not to be monitored during this time.8.2.4 Acceptability of test resultsThe maximum temperature rise shall not exceed the following:Contacts 55 C8.3 Verification of overload operationPart 1, Table 4Test 1 1.35 InTest 3 2.0 InTest 5 5.0 Infor time-
22、delay fuses only8.4 Verification of operation at rated voltageFor AC Part 1, Table 5Test 1 200 kATest 2 Maximum energyTest 3 Threshold ratio. The maximum threshold ratio shall be 30.Test 4a 100 kATest 4b 50 kATest 5b 2.0 InPeak let-through current and clearing I2t recorded during tests 1, 4a and 4b.
23、For DC (optional) Part 1, Table 6Test 1 Interrupting ratingTest 2 maximum energyTest 5a 9.0 Infor time-delay fuses onlySEPTEMBER 21, 2011SUBJECT 248-178UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTest 5c 2.0 In8.5.3 Acceptability of test r
24、esultsIn addition to the requirements in Part 1: Peak let-through currents shall not exceed the levels defined bythe appropriate Let Through Function specified in Table A, as verified through measurement of peaklet-through currents at 50, 100, 200 and, if applicable, 300ka. Clearing I2t values recor
25、ded shall notexceed the limits specified in Table A as verified through measurement of clearing I2t values at 50, 100,200 and, if applicable, 300ka.SEPTEMBER 21, 2011 SUBJECT 248-17 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSEPTEMBER 21, 2011SUBJECT 248-1710No Text on This Page
