Lub tshuab hluav taws xob ntse hluav taws xob yog tsim los siv rau hauv cov hluav taws xob faib hluav taws xob ua haujlwm ntawm AC 50Hz, nrog cov ntsuas hluav taws xob ntawm 380V thiab 660V, thiab cov ntsuas tam sim no ntawm 200A txog 6300A. Nws lub luag haujlwm tseem ceeb yog txhawm rau faib hluav taws xob hluav taws xob thiab tiv thaiv cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob tiv thaiv kev phom sij uas tshwm sim los ntawm kev ua txhaum xws li overload, undervoltage, luv circuits, thiab ib qho -theem av faults. Qhov hluav taws xob hluav taws xob no muaj ntau yam kev tiv thaiv ntse, ua kom muaj kev tiv thaiv xaiv; nws ua haujlwm nrog kev ua haujlwm siab, yog li tiv thaiv qhov tsis muaj hluav taws xob tsis tsim nyog thiab txhim kho kev ntseeg tau ntawm cov khoom siv hluav taws xob.
Raws li kev ua haujlwm ib txwm muaj, nws tuaj yeem siv rau qhov tsis tshua muaj kev hloov pauv ntawm circuits. Circuit Court breakers nyob ntawm 1250A lossis qis dua yog qhov tsim nyog rau kev tiv thaiv lub cev muaj zog tiv thaiv overload thiab luv luv hauv AC 50Hz, 380V tes hauj lwm. Tsis tas li ntawd, nyob rau hauv cov xwm txheej ib txwm muaj, lawv kuj tuaj yeem ua haujlwm rau qhov tsis tshua muaj pib ntawm cov motors.