GGD hom AC low-voltage tis txee yog tsim rau cov fais fab nroj tsuag, substations, factories thiab mining lag luam thiab lwm cov neeg siv hluav taws xob ntawm AC 50Hz, ntsuas voltage 380V, ntsuas tam sim no 1000A txog 3150A kev faib tawm, raws li lub zog, teeb pom kev zoo thiab cov khoom siv hluav taws xob. hloov dua siab tshiab, faib, tswj.