The influence of actual working current on fuse selection.are plastic fuse boxes legal

　　1. It should be noted that in the early stages of understanding the normal working current of a product, it is often not particularly accurate. Because an electronic engineer often amplifies the parameters naturally and habitually when selecting device models, such as the actual measurement value being 0.42A, but habitually setting it at 0.5A, and may even consider it safe to perform some amplification, setting it at 0.8A. This is a common practice for electronic engineers when selecting self restoring fuses.

　　2. For some products, when the current is not constant, the maximum current of the product is often taken as the normal working current. Therefore, it is necessary to understand at this time:

　　A. The current at which the product operates for a long time (usually);

　　B. The duration of the maximum current;

　　C. The frequency (time interval) of the maximum current repetition.

　　When the maximum peak current of the product is not very large (less than twice), the duration is not very long (1-2 seconds), and the repetition time interval is relatively long (more than 20 seconds), the normal working current value of PTC thermistor can be selected as the current value.

　　When the maximum current duration of the product is relatively long (greater than 30 seconds), the maximum peak current of the product should be selected as the normal working current value.

　　For products where the maximum current duration is not very long, but the repetition time interval is relatively short (less than 5 seconds), we should choose a value less than or close to the maximum current of the product as the normal working current.

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