SF6-free medium-voltage switchgear suppliers
SF6 is a potent greenhouse gas used to insulate compact medium-voltage switchgear, and buyers are now asking for options without it. 5 suppliers have a verified SF6-free MV product: ABB (UniGear ZS1, air-insulated), Hyosung and JST (dry-air GIS), Lucy Electric (synthetic air) and S&C Electric (Vista Green, a CO2 mixture). Voltage, current and kA for each follow the table.
| SF6-free product | ||||||
|---|---|---|---|---|---|---|
| ABB | UniGear ZS1 (air-insulated) | 40.51 | 631 | 4,0001 | Switzerland | 2026-11-11 |
| Hyosung Heavy Industries | ProGIS Series D dry-air GIS (GWP 0): 25.8–38 kV, 630–3150 A, up to 40 kA/3 s; listed model D252 is 25.8 kV, 2000 A, 25 kA/1 s | 381 | 401 | 4,0001 | South Korea | 2026-11-11 |
| JST Power Equipment | J20N dry-air GIS: 38 kV, 1200 A, 31.5 kA | 381 | 401 | 3,0001 | United States | 2026-11-11 |
| Lucy Electric | Sabre EcoTec / Aegis EcoTec using synthetic air | 382 | 255 | 6302 | United Kingdom | 2026-11-11 |
| S&C Electric | Vista Green; CO2/C4-FN gas mixture (SF6-free, not fluorine-free) | 382 | 252 | 2,0002 | United States | 2026-11-11 |
What SF6-free means in these rows
How ratings are readAir, dry air or a gas mixture
Air-insulated designs need no gas at all and use more floor space. Dry-air gas-insulated designs keep the compact footprint. Mixture designs such as S&C’s Vista Green use CO2 with a fluorinated component: SF6-free, but not fluorine-free. The product column states which, and the rating scope on each supplier page says which model the figures describe.
Ratings can differ from the SF6 version
JST’s dry-air J20N is rated 38 kV, 1,200 A and 31.5 kA, against 3,000 A and 40 kA for its SF6 J20X↗. Hyosung’s dry-air Series D spans 25.8 to 38 kV, but its listed D252 model is 25.8 kV, 2,000 A and 25 kA for 1 s, against 40 kA for 3 s on its SF6 ProGIS lines↗. Compare the SF6-free model, not the supplier’s headline maximum.
The full list of medium-voltage switchgear suppliers shows every maker, with or without an SF6-free product.