Schneider Electric SM AirSeT SF6-free modular switchboard
Schneider SM AirSeT, the SF6-free modular MV switchboard to 24 kV on pure air and shunt vacuum interruption
Schneider Electric SM AirSeT SF6-free modular switchboard is one of 41 data center switchgear tracked in the SecondWatt catalogue, each with specifications, lead times and indicative secondary-market pricing.
Schneider Electric SM AirSeT dossier: pure-air modular MV switchboard to 24 kV with SVI vacuum switching, SM6 compatibility, F-gas context, inspection.
Why it matters
SM6 is one of the most installed MV switchboard platforms in the world, and SM AirSeT is its drop-in decarbonization path, which makes it the volume vehicle of the SF6-free transition in secondary distribution. The RMU-versus-switchboard naming fix keeps SecondWatt's taxonomy aligned with how Schneider actually sells the family.
Who buys it
Utilities and campus networks replacing SM6-era SF6 switchboards ahead of the EU 2026 cutoff are the core buyers, with the SM6 footprint compatibility the deciding feature. Data center MV rooms in IEC markets take it for ring and feeder duty; no used channel exists to buy from.
Role in the data center
SF6-free MV ring and feeder switchboards in IEC-market campus networks, particularly SM6 replacements inside existing electrical rooms.
Key specifications
| Voltage ceiling | 24 kV |
|---|---|
| Technology | pure air + SVI vacuum |
| Functional units | switch / switch-fuse / breaker |
| Switch positions | 3 (closed/open/earthed) |
| Digital options | wireless sensors, arc relay, T300 RTU |
| Platform compatibility | SM6 footprint |
| Design life | 40 years |
| Commercial debut | 2021-04-13 |
| Awards | Hannover Messe 2020, iF Design, enerTIC |
Technical summary
Voltage: up to 24 kV Technology: pure air + Shunt Vacuum Interruption (SVI); CompoDrive mechanism Functional units: switch, switch-fuse, circuit breaker Switching: 3-position (closed / open / earthed) Digital: wireless condition sensors, arc detection relay, optional T300 RTU Compatibility: SM6 footprint and interface Design life: 40 years Debut: 2021-04-13; pilots with GreenAlp, EEC Engie, E.ON, Renault
Pricing and availability
Trend: up Lead time, new: 32-50 weeks (secondary/pad-mount class proxy). Lead time, used or refurbished: No used supply exists. 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
Procurement channels
The SM6 predecessor fleet is the future decommission pipeline to watch.