Bussmann ® Ferrule FWX 250V (U.L.) Size 1-30A Electrical Characteristics I2t (A2S) Rated Current Clearing RMS-Amps Pre-arc at 250V ® Ordering Information Watts Loss Part Number Carton Qty. Dimensions Curves Figure Number BIF # Carton Weight (kg) 1 — — — FWX-1A14F 2 — — — FWX-2A14F 3 — — — FWX-3A14F 4 — — — FWX-4A14F 14 ≈ 51mm 5 1.6 13 1.3 FWX-5A14F 10 0.225 Fig. 1 35785302 (·Ω¡§∑) 10 3.6 24 3.4 FWX-10A14F 15 14 83 3.8 FWX-15A14F 20 33 200 4.6 FWX-20A14F 25 58 300 5.3 FWX-25A14F 30 100 500 5.9 FWX-30A14F 50 200 1800 5.7 FWX-50A14F n Interrupting rating 200kA RMS Symmetrical. 1 kg = 2.2 lbs. 1 lb = 0.45 kg n Watts loss provided at rated current. n (250 Vdc/Interrupting rating 50kA) U.L. Recognition on 5 through 30 amperes only. Consult Bussmann for additional ratings. n See accessories on page 90. Dimensions Fig. 1: 1-30 Amp Range 50.8 (2.000") 14.3 (0.563") Dimension in mm. 1mm = 0.0394∑ 1∑ = 25.4mm 15.5 (0.610") 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%. 1.4 1.2 1.5 K 1.0 Kp 0.8 UL 103 1.0 0.6 0.5 800 0.4 600 500 0.5 0.3 400 0.3 0.2 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 . 0.2 300 Eg 0.15 75 7-18-01 125 200 SB01191 250 300 Eg 200 50 100 150 200 250VRMS 0.1 30 40 50 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. Ib 60 70 80 90 100% Form No. Page 1 of 1 BIF Doc #720006

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