Uluhlu lwe-VS1-12 oluqinileyo olutywiniweyo lwe-vacuum yesekethe yangaphakathi yi-switchgear yangaphakathi ephezulu ye-voltage yesigaba sesithathu sombane olinganisiweyo we-12kV kunye nokuphindaphinda kwe-50 Hz.Isetyenziswa njengesixhobo sokukhusela kunye nokulawula ngenxa ye-vacuum circuit breaker.Izibonelelo ezikhethekileyo zifaneleke ngokukodwa kwimisebenzi eyenziwa rhoqo efuna ireyithingi yangoku okanye i-multiple-short-circuit currents.
I-VS1-24 uthotho oluqinileyo-lutywiniweyo lwezaphuli zesekethe zevacuum zangaphakathi zixhonywe ngokuzinzileyo, ikakhulu zisetyenziselwa i-switchgear esisigxina.I-breaker circuit ingasetyenziswa yodwa okanye kwi-ring power supply, i-box transformer okanye i-non-power supply system eyahlukeneyo.