Incazelo emfushane:

I-voltage elinganisiwe yokukhululwa kwe-shunt engaphansi kwe-voltage (Ue) ingu-230V noma u-400V. Lapho i-external

i-voltage ishintshashintsha phakathi kuka-35% Ue, ukukhululwa kwe-shunt kungavimbela i-circuit-breaker ukuthi

ukuvala; futhi lapho i-voltage yangaphandle ishintshashintsha phakathi kuka-85% Us no-110% Us, i-shunt

ukukhululwa kungaqinisekisa ukuvalwa kwe-circuit breaker.