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FWP-40B Datasheet(PDF) 2 Page - Cooper Bussmann, Inc. |
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FWP-40B Datasheet(HTML) 2 Page - Cooper Bussmann, Inc. |
2 / 20 page For other power factor values, the total clearing integral can be calculat- ed as a multiple of the clearing integrals, the correction factor K and the correction factor X. Arc Voltage This curve gives the peak arc voltage, UL, which may appear across the fuse during its operation as a function of the applied working voltage, Eg, (rms) at a power factor of 15%. Power Losses Watts loss at rated cur- rent is given in the electri- cal characteristics. The curve allows the calcula- tion of the power losses at load currents lower than the rated current . The correction factor, Kp , is given as a function of the RMS load current, Ib , in % of the rated current . Cut-Off Current A fuse operation relating to short-circuits only. When a fuse operates in its current-limiting range, it will clear a short-cir- cuit in less than 1⁄2 cycle. Also, it will limit the instantaneous peak let-through current to a value substantially less than that obtainable in the same circuit if that fuse were replaced with a solid conductor of equal impedance. A asymmetrical current B symmetrical current For product data sheets, visit www.cooperbussmann.com/products/datasheet.asp 88 High Speed Fuses Prospective Current in Amperes RMS 10 2 ≈ 10 2 2 10 3 10 4 10 5 10 3 10 4 10 5 10 6 A B General applications Rated Voltage The ac voltage rating of Cooper Bussmann® fuses is given in volts rms. Fuses tested to IEC are tested at 10% above their rated voltage. British Style BS 88 fuses are tested at 5% above its rated voltage. UL recognition tests are performed at the rated voltage. Rated Current Rated current is given in amperes rms. Cooper Bussmann fuses can continuously carry the rated current. Melting Characteristic The melting char- acteristic shows the virtual melting time in seconds as a function of the prospective current in amperes rms. The fuses are spe- cially constructed for short-circuit pro- tection against high level fault currents. Loading and opera- tion of the fuse in the non-continu- ous/dashed section of the melt curve must be avoided. The curve can also be read as the real melting time as a function of the RMS value of the pre-arc current. Clearing Integrals 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 work- ing voltage, Eg, (rms). 10 4 10 3 10 2 10 1 2 24 6 8 2 10 2 24 6 8 10 3 2 4 6 2 6 4 10 0 2 6 4 10 1 2 6 4 2 6 4 2 6 4 6 4 2 6 2 4 Prospective Current In Amperes RMS 10 –4 10 –3 10 –2 10 –1 K 1.5 1.0 0.5 0.4 0.3 0.2 100 200 300 400 500 600 660 E g 1.0 0.9 0.8 0.7 0.1 0.2 0.3 0.4 0.5 COS X U L 1.4 1.2 103 6 8 7 9 5 4 3 200 300 400 500 600 660 Eg Kp 1.0 0.8 0.4 0.5 0.6 0.3 0.2 0.1 30 40 50 60 70 80 90 100% I b |
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