Structure elements of cubicle sealed compartments (a circuit-breaker compartment and a busbar compartment) are made of stainless steel sheets. Front parts are made of steel sheets with powder coating. All other parts of the cubicle frame are made of steel sheets with aluminium-zinc alloy coating.
Switchgears series KU35S are fitted with vacuum circuit-breakers series BPC-35. Circuit-breaker poles and busbars are sealed in enclosures filled with sulphur hexafluoride gas (SF6). Circuit-breakers are designed for rated currents of up to 2500 A and rated breaking currents of up to 31.5 kA.