POTENTIAL TRANSFORMER 3.6 kV 38 kV FUSES Application Notes These are a range of fuses with low current rating, for use with voltage transformers or operating transformers to pro- 1.In order to minimize the risk of deterioration of the fine vide isolation of the associated system in the event of faults fuse elements caused by corona, it is desirable to mount in the transformer circuit. the fuses so that grounded metal is not in the immediate vicinity of the part of the barrel between the ferrules. Advantages of Edison P.T. Fuses Most fuses have two elements in parallel, ensuring satisfac- 2.It is recommended that all three fuses are replaced when tory operation at much smaller values of overcurrent than is the fuse in one or two phases has operated unless it is possible with single element fuse. definitely known that no overcurrent has passed through the unmelted fuses. The elements are wound on a ceramic former, thus ensur- ing correct spacing of the elements from the body wall and from each other and hence giving assurance of correct operation in service. Switching (arc) voltages comply with the IEC282-1. AB & AM Series Catalog Dimensions (Figure 1) kV Number Ampere Ratings Type Length Diameter IR 3.6 3.6ABWNA(amp) 3.15, 6.3 AB 5.6 1 3.6 3.6ABCNA(amp) 3.15, 6.3, 10 AB 7.69 1 5.5 5.5ABWNA(amp) 0.5E, 1.0E, 2.0E, 3.0E, 5.0E AB 5.6 1 5.5 5.5AMWNA(amp) 0.5E, 1.0E, 2.0E, 3.0E, 5.0E AM 5.6 .81 7.2 7.2ABWNA(amp) 3.15, 6.3 AB 5.6 1 7.2 7.2ABCNA(amp) 3.15, 6.3 AB 7.69 1 50KA 12.0 12ABCNA(amp) 3.15 AB 7.69 1 15.5 15.5ABFNA(amp) 3.15 AB 10.00 1 17.5 17.5ABGNA(amp) 3.15 AB 14.13 1 24.0 24ABGNA(amp) 3.15 AB 14.13 1 36.0* 36ABGNA(amp) 3.15 AB 14.13 1 *For clean indoor applications only. CAV Series Catalog Dimensions (Figure 2) kV Number Ampere Ratings Type Length Diameter IR 3.6 3.6CAV(amp) 2 8CAV 8.66 5.5 5.5CAV(amp) 15E 7CAV 7.375 5.5 5.5CAVH(amp) 0.5E, 1E, 2E 7CAVH 7.375 7.2 7.2CAV(amp) 2, 10 8CAV 8.66 12 12CAV(amp) 2 8CAV 8.66 15.5 15.5CAV(amp) 0.5E, 1E, 2E, 3E, 7E 12CAV 12.87 1.63 40KA 15.5 15.5CAVH(amp) 0.5E, 1E, 2E 12CAVH 12.87 17.5 17.5CAV(amp) 2, 4, 6, 10 8CAV 8.66 24 24CAV(amp) 2, 3, 4 13CAV 13.39 36 36CAV(amp) 2, 4 17CAV 17.32 38 38CAV(amp) 4E 17CAV 17.32 38 38CAVH(amp) 0.5E, 1E, 2E 17CAV 17.32 129POTENTIAL TRANSFORMER 3.6 kV 38 kV FUSES .21 Dimensions (Type AB & AM) .5 5.3mm 12.7mm .34 8.6mm .68 FOR DIAMETER 17.3mm SEE TABLE 1 25.4mm 0.63 (15.9mm) FOR AMWNA 1.26 (32.1mm) FOR ALL OTHERS FOR LENGTH SEE TABLE Figure 1 1.37 Dimensions (Type CAV) 34.8mm FOR DIAMETER SEE TABLE Ref. No. A3354705 For 1 diameter potential trans- 1.18 former fuses. 30.20mm FOR LENGTH SEE TABLE Figure 2 Time/Current-Curves (5.5kV AMWNA) (5.5kV ABWNA & 15.5kV CAV) RATING RATING 1,000 1,000 100 100 10 10 1 1 .1 .1 .01 .01 RMS SYMMETRICAL CURRENT IN AMPERES RMS SYMMETRICAL CURRENT IN AMPERES 130 TIME IN SECONDS .1 1 0.5 1.0 2.0 3.0 4.0 10 5.0 100 1,000 TIME IN SECONDS .1 1 0.5 1.0 2.0 3.0 10 100 1,000