The switchgear shall have the following design features:

• The medium-voltage part must be maintenance-free for life, and independent of environmental influences
• Small type of construction and panel dimensions as small as possible by gas-insulated design
• In internal arc-tested design (IAC A FL or FLR)
• Independent of environmental influences
• No gas work necessary on site
• Gas-tight for life
• Free of fluorinated gases and chemical additives
• Three-pole enclosure, hermetic panel by panel, made of stainless steel
• Sealed primary enclosure
• All switching devices are operated at the panel front
• Use of vacuum circuit-breakers with the possibility of remote control
• Constant insulating properties of the gas, independent of the service life
• Use of ring-core current transformers outside the enclosure (free of dielectric stress)
• Voltage transformers in metal-coated and plug-in design
• Operating mechanisms for switching devices shall be located outside the high-voltage compartments
• Maximum reliability and personal safety are requested
• With pressure relief device
• Capacitive voltage taps (capacitive voltage dividers) in the bushing to the cable feeder shall enable the verification of safe isolation from supply at the panel front without danger. The degree of protection of the switchgear must not be reduced thereby.

The switchgear must be extendable on site without longer shutdown periods.

The complete switchgear has to be designed according to the standards of the local power supply company (______).

Sustainability requirements:

• Gas insulation with F-gas free gas containing only components from the ambient air
• Compact design and thus efficient use of switchgear rooms
• Highest supply security due to maintenance-free switchgear
• Ensuring personal safety through encapsulation, earthing, interlocking, etc.
• Possibility of proper and environmentally friendly disposal
• Environmental product declaration according to ISO 14021, based on a full-scale lifecycle assessment (LCA) study according to ISO 14040/44