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KBC-110 Datasheet(PDF) 3 Page - Cooper Bussmann, Inc. |
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KBC-110 Datasheet(HTML) 3 Page - Cooper Bussmann, Inc. |
3 / 20 page High Speed Fuses For product data sheets, visit www.cooperbussmann.com/products/datasheet.asp 89 General applications Parallel Connection When fuses are connected in parallel it is recommended that the applied voltage does not exceed 0.9 UN (the rated volt- age of the fuse). This is due to the fact that the energy released within the fuses may be unevenly shared between the parallel connected barrels. When fuses are connected in parallel, one must take into account that the current sharing is not necessarily equal. And it must be checked, that the maximum load current is not exceeded. Series Connection Fuses in series may not equally divide the applied voltage. It is recommended that series connected fuses should only be operated at fault currents that yield melting times less than 10 ms and a recovery voltage per fuse of less than or equal to 0.9 UN (the rated voltage of the fuse). Mounting Guidance The recommendations below have to be followed when mounting a Cooper Bussmann fuse with end plate threaded holes. 1. Screw in studs: 5 N•m Max, 3 N•m Min 2. Attachment of the fuse to buss-bar by means of nut and washer: Thread Torque (N•m)* Configuration Max Min 5 ⁄16” – 18, M8 25 20 3 ⁄8” – 16, M10 45 40 3 ⁄8” – 24 45 40 1 ⁄2” – 13, M12 65 50 1 ⁄2” – 20 65 50 *1 N•m = 0.7375 lb-ft Overloads The design of Cooper Bussmann® fuses is such that they can be operated under rather severe operating conditions imposed by overloads (any load current in excess of the maximum permissible load current). In applications, there will be a maximum overload current, Imax, which can be imposed on the fuse with a corresponding duration and frequency of occurrence. Time durations fall into two categories: 1. Overloads longer than one second 2. Overloads less than one second termed “impulse” loads. The following table gives general application guidelines which, in the expression Imax < (% factor) x It.It is the melt- ing current corresponding to the time “t” of the overload dura- tion as read from the time-current curve of the fuse. The guidelines in the table below determine the acceptability of the selected fuses for a given Imax. Frequency of Occurrence Overloads (> 1 sec) Impulse Loads (< 1 sec) Less than once per month Imax < 80% x It Imax < 70% x It Less than twice per week Imax < 70% x It Imax < 60% x It Several times per day Imax < 60% x It — When impulse loads are an intrinsic/normal parameter of the load current either as single pulse or in trains of pulses or when their level is higher than the melting current at 0.01 seconds (per time-current curve), contact Cooper Bussmann for application assistance. In addition to the parameters set forth in the preceding table, the RMS value of the load current as calculated for any period of 10 minutes or more should not exceed the maxi- mum permissible load current. Furthermore, it is important that a fuse should not be applied in the non-continuous/dashed portion of the associated time-current curve. Any time-current combination point which falls in the non-continuous/dashed portion of the time-current curve is beyond the capability of the fuse to operate properly. DC Operation Depending upon the short-circuit time constant and the mag- nitude of the prospective short-circuit current, the dc voltage at which a fuse can be applied may be less than its ac rating. Long time constants require a lower dc voltage. Conversely, however, higher available prospective short-circuit currents result in faster fuse openings and thus permit a fuse to be operated at a higher dc voltage. Consult Cooper Bussmann for additional information and application assistance when fuses have to operate under dc conditions. Load Current Versus Conductor Cross Section Reduction of permissible load current when the conductor cross section is less than that given in IEC Publication 269-1 & 4 valid for Cooper Bussmann semiconductor fuses. Application Assistance If you have application problems or need a fuse outside our standard program, please contact the nearest Cooper Bussmann representative. Phone numbers are shown on the back cover. 1.0 0.9 0.8 0.5 0.6 0.7 0.8 0.9 1.0 ≈ (IEC cross section) Reduction Factor |
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