According to the different insulation pillar structures, it can be divided into single column disconnectors, double column disconnectors, and three column disconnectors. The single column isolation switch directly uses the vertical space below the overhead busbar as electrical insulation for the break, therefore, it has obvious advantages of saving land area, reducing the number of lead wires, and having a particularly clear opening and closing state. In the case of ultra-high voltage transmission, the use of single column isolation switches in substations has a more significant effect on saving land area.

According to different voltage levels
Low voltage isolation switch and high voltage isolation switchs
Common high-voltage isolation switch models
CR center break isolation switch (126kV~252kV)
DR double-sided isolation switch (72.5kV~363kV)
KR double column horizontal telescopic isolation switch (126kV~550kV)
PR single column double arm vertical telescopic isolation switch (126kV to 500kV)
SR horizontal rotating single side break type isolation switch (40.5kV)
VR V-type center break isolation switch (126kV)
YR single column and single arm vertical telescopic isolation switch (126kV~550kV)