Bussmann ® Square Body – US Style 1250V/1300V (IEC/U.L.) 50-1400A Electrical Characteristics Size Rated Current RMS-Amps 50 63 80 100 125 160 200 250 315 350 160 200 250 315 350 400 450 †500 †550 ‡630 250 280 315 350 400 450 500 550 630 †700 †800 ‡900 ‡1000 315 350 400 450 500 550 630 700 800 900 ¥1000 ¥1100 ¥1250 ¥1400 1* 1 2 3 n n n n ¥ Pre-arc I2t (A2S) Clearing at 1000V 135 215 420 750 1450 2600 5150 9200 18500 27000 1900 3800 7750 15000 20000 29500 42000 69500 95000 130000 6500 9350 13000 16500 23000 34000 48000 62000 115000 160000 245000 360000 480000 9500 13500 19500 31000 39000 55000 83500 115000 205000 305000 450000 575000 810000 1250000 815 1300 2500 4450 9000 16000 31000 54500 115000 165000 11500 22500 46000 90000 125000 175000 250000 340000 465000 660000 38500 55500 77500 97500 140000 205000 285000 370000 575000 795000 1200000 1750000 2350000 58000 81500 120000 185000 235000 325000 495000 705000 995000 1500000 2150000 2800000 3950000 6000000 Ordering Information Clearing at 1250V Watts Loss -FU/115 Visual Indicator -FKE/115 Type K Indicator for Micro 1100 1750 3350 5950 11500 21000 41000 73000 150000 220000 15500 30000 61500 120000 165000 235000 335000 15 20 25 30 35 40 45 55 60 65 45 50 60 65 70 75 80 85 95 100 65 70 75 80 85 90 95 100 110 115 120 125 135 185 90 95 100 105 110 115 120 125 130 135 140 145 150 170M3688 170M3689 170M3690 170M3691 170M3692 170M3693 170M3694 170M3695 170M3696 170M3697 170M4688 170M4689 170M4690 170M4691 170M4692 170M4693 170M4694 170M4695 170M4696 170M4697 170M5688 170M5689 170M5690 170M5691 170M5692 170M5693 170M5694 170M5695 170M5696 170M5697 170M5698 170M5699 170M5700 170M6688 170M6689 170M6690 170M6691 170M6692 170M6693 170M6694 170M6695 170M6696 170M6697 †170M6698 †170M6699 ‡170M6700 ‡170M6701 170M3738 170M3739 170M3740 170M3741 170M3742 170M3743 170M3744 170M3745 170M3746 170M3747 170M4738 170M4739 170M4740 170M4741 170M4742 170M4743 170M4744 170M4745 170M4746 170M4747 170M5738 170M5739 170M5740 170M5741 170M5742 170M5743 170M5744 170M5745 170M5746 170M5747 170M5748 170M5749 170M5750 170M6738 170M6739 170M6740 170M6741 170M6742 170M6743 170M6744 170M6745 170M6746 170M6747 †170M6748 †170M6749 ‡170M6750 ‡170M6751 51500 74500 105000 135000 180000 270000 380000 495000 730000 77500 110000 160000 245000 310000 435000 665000 940000 1300000 1900000 Interrupting rating 300kA RMS Symmetrical. Watts loss provided at rated current. Rated voltage (IEC) †1100 ‡1000V (Consult Bussmann for U.L. Recognition status.) Microswitch indicator ordered separately. See accessories on pages 58-59. U.L. Recognition at 1000V. rev. 6/29/98 ® Carton Qty. Curves Carton Weight (kg) See Page or (BIF #) 1 0.425 page 63 (17056630) 1 0.675 page 64 (17056632) 1 0.740 page 64 (17056634) 1 1.250 page 65 (17056636) 1 kg = 2.2 lbs. 1 lb = 0.45 kg Form No. Page 1 of 2 BIF Doc #720032 Bussmann ® Square Body – US Style 50-1400A 1250V/1300V (IEC/U.L.) Electrical Characteristics Total Clearing I2t The total clearing I2t at rated voltage and at power factor of 15% are given in the electrical characteristics. For other voltages, the clearing I2t is found by multiplying by correction factor, K , given as a function of applied working voltage, E g , (RMS). Arc Voltage This curve gives the peak arc voltage, U L , which may appear across the fuse during its operation as a function of the applied working voltage, E g , (RMS) at a power factor of 15%. 1.5 K 1.25 1.0 3 2.5 Power Losses Watts loss at rated current is given in the electrical characteristics. The curve allows the calculation of the power losses at load currents lower than the rated current . The correction factor, K p , is given as a function of the RMS load current, Ib , in % of the rated current . 1.0 Kp 0.8 UL 0.6 0.5 1.8 1.4 0.4 0.5 0.4 103 8 0.3 0.3 6 5 0.2 0.2 4 Eg 400 600 800 Eg 3 400 1000 1200 1400 600 800 Ib 0.1 30 40 50 1000 1200 1400 60 70 80 90 100% -----Dashed lines apply to the following amperages: Size Amp 1* 400 1 500-630 2 630-1000 3 800-1400 Dimensions US Style: Type -FU/115, -FKE/115 Size 1* 1 2 3 B C1 C2 D E H I 156 160 160 159 130 127 127 128 101 102 102 101 59 69 77 92 45 53 61 76 20 25 25 36 10 14 14 16 B Dimension in mm. 1mm = 0.0394∑ 1∑ = 25.4mm 6 74 D C1 E C2 E I H This bulletin is intended to clearly present comprehensive product data and provide technical information that will help the end user with design applications. Bussmann reserves the right, without notice, to change design or construction of any products and to discontinue or limit distribution of any products. Bussmann also reserves the right to change or update, without notice, any technical information contained in this bulletin. Once a product has been selected, it should be tested by the user in all possible applications. rev. 6/29/98 Form No. Page 2 of 2 BIF Doc #720032