company news about When selecting fuse, how to use I-t curve and I-t table correctly?

        The I-t curve for design and selection completely reflects the functional relationship between the two, from which the fusing time of the fuse under any current load can be found, but a curve can only reflect the average value of one specification fuse, and the actual test results should be near the curve;

        The I-t table is the basis for inspection and acceptance. The table reflects the data of key points on the curve (generally 2~6). When the fuse is under these current loads, the fuse action time is within a range. The actual fusing time of the qualified fuse under these currents on the load table should be within the range.

        Use the I-t curve to select the rated current specification of the fuse: according to the protection requirements of the appliance or circuit, especially the requirement that the fuse must respond to the action within a certain period of time when an overcurrent occurs, select the fuse specification represented by the closest curve. It should be noted that the curve represents the average value, as long as the nearest one is selected, there is no need to pursue accuracy;

        Use the I-t table to verify whether the selected fuse is suitable: according to the circuit protection requirements and the data in the I-t table, the fuse of the selected specification is actually tested for fusing characteristics. As long as it meets the protection requirements and is not far from the I-t curve, it means that the selection is correct; It is also necessary to compare the data in the I-t table. It can't be too close to the upper and lower limits, and the consistency is good; The I-t table is also more important for inspection and acceptance as a criterion of conformity.