我段运用东风_4型机车以来,机车照明电路的控制开关ZMK多次烧损,直接影响了机车的正常运行。笔者认为造成烧损的主要原因是ZM K开关选型不当。ZMK采用的是LW5—15—D—040/2型万能转换开关,其额定电流为15A,而按照明电路的总容量粗略计算,工作电流可达28A左右,远大于开关的额定电流,因此开关发热烧损就不足为奇了。LW5—15—D— I paragraph Dongfeng _4 locomotive used since the locomotive lighting control switch ZMK burning many times, a direct impact on the normal operation of the locomotive. I think the main reason for burning is ZM K switch improper selection. ZMK uses LW5-15-D-040/2 universal transfer switch, the rated current of 15A, and according to the total capacity of the circuit rough calculation, the operating current up to 28A, much larger than the rated current switch, the switch Burning fever is not surprising. LW5-15-D-