GIS · Gas-insulated switchgear
Insulated-enclosure switchgear that packs high-voltage switching into a fraction of the air-insulated footprint, at high cost and some of the longest lead times on a project.
Current numbers
as little as ~30% of AIS areaABB ZX GIS at 38 kV: up to 70% smaller than AIS; a vendor figure, not a whole-yard ratio