company news about Solution to abnormal fusing of fuse

        As a current-sensitive element, the function of the fuse is to judge the overcurrent: fusing is the protection function of the fuse when the fault overcurrent is not allowed; For non-fault overcurrent such as instantaneous pulse, the fuse should be able to withstand enough times to ensure the normal use of the whole machine. The current during the test or inspection will generally not exceed the startup pulse during normal use, and the number of power-on times will not exceed 10. The fuse should never act. Once abnormal fusing occurs, there must be a problem. If the cause of abnormal fusing is not found in time, simply replacing the fuse or increasing the fuse capacity can not prevent the recurrence of similar problems

        During some power-on tests or inspections during the customer's production process, it is occasionally found that a certain proportion of fuses are burnt out, and everything is normal after replacing another fuse. Does this mean that the quality consistency of this batch of fuses is not good? We must consider both overcurrent and fuse separately:

        The customer of the complete machine needs to check whether the pulse current of the circuit of the complete machine is abnormal. Two points should be considered when analyzing the problem: first, whether there is any error in the calculation at the time of model selection, the maximum pulse waveform is not captured due to the randomness of the startup pulse, the distribution range of the fuse melting heat value is not taken into account in the calculation, and the aging allowance for multiple shocks is not enough, which may cause the lack of model selection; The second is whether the circuit condition has changed during the production process. The changes in the circuit structure caused by the changes in the model, the changes in the specifications or brands of some components in the circuit, and the changes in the parameters of the components such as the capacitive inductor switch may also cause the changes in the circuit pulse waveform; The application engineer of the fuse manufacturer needs to cooperate with the customer to conduct circuit technical analysis and grasp and measure the actual pulse energy, eliminate each change one by one, and both parties will analyze and evaluate together.

        The fuse manufacturer needs to check and detect whether the melting heat value of the fuse is abnormal. When analyzing the problem, we should also consider from two perspectives: first, the melting heat value of this batch of fuses meets the requirements of product specifications, but due to the inter-batch distribution of product parameters, the melting heat value of this batch of products may be smaller, which is significantly different from other batches of products used in trial production or previous production; The second is that the melting heat value of this batch of fuses has exceeded the product specification requirements, or the melting heat value of some products is less than the specification range due to the large dispersion between individual products; In addition to the fuse manufacturer's analysis of the original production and inspection records and failure samples, the complete machine customer also needs to provide on-site data for analysis.