Schneider Electric GM AirSeT SF6-free primary GIS
Schneider GM AirSeT, pure-air primary GIS to 24 kV that replaces SF6 with air and vacuum interruption
Schneider Electric GM AirSeT SF6-free primary GIS is one of 41 data center switchgear tracked in the SecondWatt catalogue, each with specifications, lead times and indicative secondary-market pricing.
Schneider Electric GM AirSeT dossier: pure-air primary GIS to 24 kV with vacuum interruption, digital monitoring, F-gas context, market structure.
GM AirSeT is Schneider Electric's SF6-free primary-distribution gas-insulated switchgear, launched 2022-06-03 as the top of the AirSeT family: pure-air insulation (no F-gases, no proprietary mixtures) in a factory-sealed tank with vacuum interruption. The range page documents up to 24 kV with an example configuration at 12 kV, 1,250 A, 31.5 kA, dual-busbar options, and a GM AirSeT Performance variant; one third-party guide claims 36 kV capability that does not verify against se.com and is flagged rather than published. The line ships natively digital: wireless thermal and humidity sensors, embedded optical arc-flash detection, gas-pressure monitoring, optional partial-discharge and breaker-health monitoring, and the EcoCare condition-based service plan claiming 40% maintenance reduction. That absence is itself index data, SF6-free MV gear has no used supply yet, so buyers needing immediate delivery still land on legacy SF6 or air-insulated stock.
Why it matters
GM AirSeT is Schneider's answer to the category's defining transition, and its pure-air approach (versus Siemens clean air and Hitachi's C4-FN chemistry) is one of the two philosophies splitting the SF6-free market. Tracking when AirSeT units first hit auction will date the birth of the SF6-free secondary market.
Who buys it
EU utilities and sustainability-driven campus operators specify GM AirSeT for primary substations ahead of the 2026 F-gas cutoff; data center operators in IEC markets take it for MV rooms where SF6 handling is unwanted. There is nothing to buy used; procurement is new-build against 60-80 week class leads.
Role in the data center
Primary MV substation switchgear for IEC-market campuses seeking SF6-free rooms with built-in condition monitoring; new-build specification only.
Key specifications
| Voltage ceiling | 24 kV |
|---|---|
| Example configuration | 12 kV / 1,250 A / 31.5 kA |
| Insulation | pure air, sealed tank + vacuum |
| Arc-flash detection | embedded optical |
| Condition monitoring | thermal, humidity, pressure, optional PD |
| Maintenance claim | -40% (EcoCare) |
| Launch | 2022-06-03 |
| Unverified claim flag | 36 kV (third-party) vs 24 kV (se.com) |
Technical summary
Voltage: up to 24 kV Example configuration: 12 kV / 1,250 A / 31.5 kA Insulation: pure air, factory-sealed tank; vacuum interruption Variants: GM AirSeT and GM AirSeT Performance; dual-busbar options Digital: thermal/humidity sensors, optical arc-flash detection, PD monitoring option Service: EcoCare plan claiming 40% maintenance reduction Design life: 40 years (third-party guide) Launch: 2022-06-03; SeT Series platform
Pricing and availability
Trend: up Lead time, new: 60-80 weeks (MV metal-clad class). Lead time, used or refurbished: No used supply exists (line <5 years old). Warranty, used: 1-year typical from reconditioning dealers.
Lifecycle and maintenance
Gas-insulated switchgear targets 35-40 year service from sealed-for-life compartments with minimal maintenance: density monitoring, PD surveys, and mechanism service. Sealed tanks cannot be repaired in the field, so gas loss or internal fault usually ends the asset. EU F-gas and CARB rules add end-of-life SF6 recovery and reporting obligations that must be priced into any SF6 unit, while SF6-free designs (clean air, dry air, C4-FN mixtures) remove that liability entirely.
Common failure points
- Gas leakage — Density alarms and lockout; insulation margin lost as pressure falls
- Partial discharge in compartments — PD at spacers, particles, or terminations progressing to internal fault
- Operating mechanism — Spring and motor failures on switch and breaker drives
- Cable terminations — Tracking in cable boxes and poorly seated plug-in connectors
- Density monitor drift — False alarms or missed low-gas conditions from drifted gauges
- End-of-life gas liability — SF6 recovery and reporting costs land on the owner at decommissioning
Inspection checklist
Gas density — verify density monitors against nameplate fill (150 kPa class systems); alarm thresholds intact Leak rate — review gas top-up logs; leakage above 0.5% per year fails modern acceptance Gas quality — test SF6 moisture and decomposition before transfer; SO2 presence flags internal arcing F-gas compliance — verify EU 2024/573 and CARB status; new SF6 MV gear is barred from the EU market from 2026 Partial discharge — UHF or acoustic survey per IEC 60270 practice; PD is the dominant latent defect Vacuum interrupters — hipot test breaking units; interruption is vacuum even in gas-insulated designs Mechanism — exercise and verify spring charge; check counters against 10,000-operation class ratings Terminations — inspect cable boxes for tracking; verify stress cones and plug-in connectors seated Enclosure — verify sealed-compartment integrity (IP65 class HV parts), pressure relief, and corrosion Interlocks — verify 3-position switch logic (closed/open/earthed) and padlock provisions Gas handling — confirm certified handling equipment and trained personnel for any gas transfer Monitoring — verify density and PD telemetry channels report correctly to the control system Nameplate — confirm kV class, BIL (75-185 kV in MV GIS), kA rating, and busbar current Standards — IEC 62271-200 (or -203 HV) type-test documentation present and matching configuration Records — gas logs, factory routine tests, and service history; sealed units without logs reprice sharply