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The internal resistance of a fuse is an index that reflects its own power consumption in the circuit. The larger the resistance value, the more power it consumes. For fuses, there are two parameters for detecting this indicator: voltage drop or cold resistance.
The voltage drop refers to the reading of the voltage drop after the melt reaches thermal equilibrium under the condition of the rated current of the fuse. When measuring, the rated current must be applied to the fuse, and it must take a few minutes after the reading is stable, which is troublesome and time-consuming.
Cold resistance refers to: the resistance value reading in the cold state under the condition of basically no load, which is simple and fast. Therefore, the cold resistance method is often used in the detection of fuses. A load of less than or equal to 10% means that it basically has no load and no heat generation, so there is no process of thermal balance, and the ambient temperature itself has an impact on the performance of the fuse. To a certain extent, all performance indicators of the fuse are parameters under normal atmospheric conditions, that is, parameters at 25°C. There may be errors in the cold resistance of the fuse measured under conditions other than the above.