2. Major shortcomings and weaknesses of the fuse must be replaced 1) fuse fuse failure; 2) protection function of a single, only some characteristics of inverse time overcurrent, overload, short circuit and ground fault protection are used here; and 3) the occurrence of a phase fuse When, fuses, three-phase motor will lead to adverse consequences of the two-phase operation, since the complex fuse, of course, an alarm signal can be used with a fuse to be filled, a fuse to disconnect the three-phase phase; 4) remote control can not be achieved, require electric knife switch, switch combinations possible. Each melt has a minimum melting current. Corresponding to different temperatures, different minimum melting current. Although the current external environment by, fuse factory outlets, but in practice may not be considered. Rated current ratio is generally defined minimum melt and melt fusing current minimum melting factor, commonly melt melting factor greater than 1.25, which means that the rated current of 10A melt when the current 12.5A or less will not be blown. Spiral fuses, fuse, Xi'an by the Xi'an high Huayi power plant. Xian Huayi Electric Power Equipment Factory (www.xahy.com) strong, credible, in the Xi'an high-voltage circuit breakers and other industries has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Huayi electricity into the brilliant and you work for a better future!