Bussmann (R) FWX 250V Rated Current RMS-Amps Type 35-2500A Electrical Characteristics I2t (A2 Sec) Clearing Pre-arc at 250V (R) Ordering Information Watts Loss Part Number Carton Qty. Carton Weight (lbs) 5 1.40 Dimensions Curves Figure Number BIF # 35 50 230 4.2 FWX-35A _____________________________________________________________________________________ _ 40 60 310 5.2 FWX-40A ____________________________________________________________________________________ __ 45 80 390 5.7 FWX-45A ____________________________________________________________________________________ __ 50 100 520 6.0 FWX-50A ____________________________________________________________________________________ __ 60 140 740 8.1 FWX-60A ____________________________________________________________________________________________________________ _ 70 330 1400 7.2 FWX-70A ____________________________________________________________________________________ __ 80 430 1850 8.1 FWX-80A ____________________________________________________________________________________ __ 90 570 2450 9.0 FWX-90A ____________________________________________________________________________________ __ 100 740 3150 10.0 FWX-100A ____________________________________________________________________________________ __ 0.32 125 1130 4850 12.5 FWX-125A ____________________________________________________________________________________ __ 359 150 1620 6950 15.7 FWX-150A ____________________________________________________________________________________ __ 175 2170 9300 18.5 FWX-175A ____________________________________________________________________________________ __ Fig. 1 200 2790 12000 22 FWX-200A _____________________________________________________________________________________ _ ______________ 225 3210 14700 24 FWX-225A ____________________________________________________________________________________ __ 250 3960 18100 27 FWX-250A FWX ____________________________________________________________________________________ __ 250V 275 4720 21600 31 FWX-275A ____________________________________________________________________________________ __ 300 6000 27300 32 FWX-300A ____________________________________________________________________________________ __ 350 10600 48600 39 FWX-350A ____________________________________________________________________________________ __ 1 0.52 400 14500 66100 44 FWX-400A ____________________________________________________________________________________ __ 450 22100 101000 49 FWX-450A ____________________________________________________________________________________ __ 500 28000 128000 54 FWX-500A ____________________________________________________________________________________ __ 600 41100 188000 62 FWX-600A ____________________________________________________________________________________ __ 700 48800 190000 72 FWX-700A ____________________________________________________________________________________ __ 800 59000 230000 84 FWX-800A ____________________________________________________________________________________ __ ______________ 0.90 1000 44000 360000 100 FWX-1000AH __ ____________________________________________________________________________________ Fig. 2 1200 92000 750000 103 FWX-1200AH ___ ___________________________________________________________________________________ 1500 120000 880000 140 FWX-1500AH ___ ___________________________________________________________________________________ 1600 160000 1200000 140 FWX-1600AH ___ ___________________________________________________________________________________ 2000 320000 2300000 151 FWX-2000AH ___ ___________________________________________________________________________________ 2500 670000 4700000 163 U.L. Recognition on 35 through 800 amperes only. _____________ 35785299 2.86 Fig. 3 FWX-2500AH 1 kg = 2.2 lbs 1 lb = 0.45 kg n Interrupting rating 200kA RMS Symmetrical. n Watts loss provided at rated current. n (250 Vdc/Interrupting rating 20kA) U.L. Recognition on 35 through 800 amperes only. 7-11-01 SB01191 Form No. FWX 250 Page 1 of 2 BIF Doc #720005 Bussmann (R) 35-2500A FWX 250V (R) 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%. 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 . 1.5 1.4 1.2 1.0 Kp 0.8 K UL 103 1.0 0.6 0.5 800 0.5 1) 600 500 2) 400 0.3 0.2 0.4 0.3 0.2 1) 300 Eg 0.15 75 125 200 250 2) Eg 200 50 300 1) 35-800 Amp Range 2) 1000-2500 Amp Range 100 150 200 Ib 0.1 30 40 50 250 60 70 80 90 100% 1) 35-800 Amp Range 2) 1000-2500 Amp Range Dimensions Fig. 1: 35-800 Amp Range Fig. 2: 1000-1200 Amp Range Fig. 3: 1500-2500 Amp Range J A A A D E C D C B C B F G H B Order # Fig. A B C D E F G H J Thread Depth FWX-35A-60A 1 3.19 0.81 1.59 2.59 2.25 0.34 0.63 0.13 0.52 -- FWX-70A-200A 1 3.13 1.22 1.59 2.44 2.19 0.34 1.00 0.19 0.47 -- FWX-225A-600A 1 3.84 1.50 1.59 2.94 2.25 0.41 1.00 0.25 0.75 -- FWX-700A-800A 1 3.84 2.00 1.59 3.03 2.28 0.41 1.50 0.25 0.78 -- FWX-1000AH-1200AH 2 2.59 3.00 1.50 -- -- -- -- -- -- Tapped *-24 TM FWX-1500AH-2500AH 3 2.59 3.50 1.50 1.50 -- -- -- -- -- Tapped *-24 TM Dimension in inches. 1mm = 0.0394 1 = 25.4mm The only controlled copy of this BIF document is the electronic read-only version located on the Bussmann Network Drive. All other copies of this document are by definition uncontrolled. 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. 7-11-01 SB01191 Form No.FWX 250 Page 2 of 2 BIF Doc #720005