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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteNeither SF₆-free gas-insulated switchgear (GIS) nor air-insulated switchgear (AIS) is the automatic choice for a data center. SF₆-free GIS may suit a site where equipment footprint is a constraint; AIS may suit a design with adequate space and equipment that meets the project’s electrical and environmental requirements. Decide from the required ratings, actual room or yard layout, operating plan, applicable rules and comparable supplier quotations—not the technology label alone.
What GIS and AIS mean
GIS encloses energized parts using an insulating medium, which can allow a more compact arrangement than traditional air-clearance equipment. But “SF₆-free GIS” describes a family of designs, not one uniform product: cited examples use dry-air or clean-air insulation and vacuum switching. ABB lists dry-air SF₆-free equipment in selected medium-voltage ranges; Siemens Energy describes its Blue GIS as using clean-air insulation with vacuum switching. Check the exact model and specification.
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AIS uses air insulation and needs electrical clearances around live parts. In a 2020 briefing, the European Commission said AIS tends to have a larger footprint than SF₆-insulated systems and that electrical parts may be exposed to environmental influences. That is a general comparison with SF₆-insulated equipment; it does not prove that every AIS layout is larger than every SF₆-free GIS installation.
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| Decision factor | SF₆-free GIS | AIS |
|---|---|---|
| Space and layout | Can be attractive when space is constrained, but footprint depends on the specific design. Siemens Energy says its clean-air GIS requires more space than its SF₆ comparison; low-power instrument transformers may offset some of that requirement. | Requires air clearances and generally needs more room than SF₆-insulated equipment, according to the European Commission’s 2020 briefing. Measure the complete installation, not just the switchgear lineup. |
| Insulation and switching | Not a single configuration. The cited examples include dry-air or clean-air insulation with vacuum switching. | Uses air insulation and clearances around energized parts. |
| Ratings | Vary by product family and model. ABB’s portfolio lists maximum rated voltages of 12 kV for PrimeGear ZX0, up to 24 kV for SafeRing/SafePlus Air, and 40.5 kV for ZX2. Siemens Energy states that its 8VM3 Blue GIS operates at 72.5 kV and describes Blue high-voltage products for substations up to 145 kV. | Must be checked against the specific product and project duty; no AIS rating comparison for a matched data-center application is established here. |
| Environment and access | Verify the chosen model’s limits and installation conditions against the site. | Consider exposure of electrical parts to environmental influences, as well as the proposed indoor or outdoor arrangement. |
| Cost and reliability | No matched data-center cost or independent reliability winner is established. | No matched data-center cost or independent reliability winner is established. |
The voltage figures above are manufacturer-published product-family or product ratings, not evidence that the listed equipment is interchangeable. Confirm ratings in the exact product documentation before comparing options.
#1 Best Overall
Match the electrical duty before comparing footprints
Start with the electrical design, not the room drawing. Compare nominal voltage, continuous current, short-circuit withstand, switching duty, bus arrangement and protection scheme for the candidate equipment. ABB’s portfolio shows that voltage, current and fault-withstand ratings vary across product families, so two products marketed for the same application may not be equivalent.
Ask suppliers to confirm that each proposed configuration meets the same project requirements, including the intended redundancy and protection design. If one option has a different bus arrangement or rating, its apparent space or price advantage is not an apples-to-apples comparison.
Measure the installation that will actually be built
Compare the whole switchgear room or yard, rather than only the equipment dimensions. Include working clearances, cable access, maintenance access, extension bays and associated civil work. GIS’s compactness can matter where land or indoor floor area is limited, but SF₆-free GIS is not necessarily as compact as an SF₆ design. Siemens Energy says clean-air insulation in its GIS requires more space and material; it identifies low-power instrument transformers as one way to offset some of the space requirement.
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For AIS, account for the required electrical clearances and the exposure conditions of the proposed installation. The Commission’s general observation about AIS exposure is a reason to check the site and equipment design, not a substitute for model-specific suitability information.
Check site conditions and maintenance requirements
Verify the manufacturer’s suitability limits for the planned indoor or outdoor installation, altitude, temperature, humidity, contamination and exposure. Do not infer that a product suitable for one site or voltage class will suit another.
Use the maintenance documents for the exact model and voltage class when planning operations. For example, Siemens Energy’s high-voltage Blue FAQ gives a 12-year visual inspection and checks schedule and a first major inspection after 25 years for the products it describes. Those intervals are product-specific; they are not a general rule for GIS, AIS or all Siemens Energy equipment.
Rank #4
Compare project cost on matched assumptions
Request quotations that use the same electrical ratings, protection, redundancy, civil scope, commissioning, spares and service assumptions. The available sources do not provide a matched data-center cost study, so they do not establish which technology has the lower purchase price or lifecycle cost. A compact lineup alone does not settle total project economics if civil work, access, service scope or other included items differ.
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Jurisdiction, equipment category and voltage matter. ABB summarizes an EU requirement for non-F-gas insulation and breaking media in medium-voltage switchgear at or below 24 kV beginning 1 January 2026. Treat that as the manufacturer’s summary of an EU- and voltage-specific rule, not a universal requirement: confirm the governing regulation, scope and any applicable exceptions with the project team before specifying equipment.
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A practical selection sequence
- Define the electrical duty: document the required voltage, continuous current, short-circuit withstand, switching duty, bus arrangement and protection scheme.
- Screen candidate models: compare their exact ratings and site suitability using model-specific manufacturer documents.
- Lay out both installations: include clearances, cables, working and service access, future extension space and civil work.
- Set the operating plan: review maintenance requirements, service support, spares and commissioning for each candidate configuration.
- Check regulatory scope: confirm the rules for the project’s jurisdiction, voltage and equipment category, including the EU date where relevant.
- Normalize supplier quotations: require the same technical, redundancy, civil and service assumptions before comparing price.
Choose SF₆-free GIS when its specific configuration meets the electrical and site requirements and its space or other project advantages justify the proposed solution. Choose AIS when its clearances and environmental suitability work for the site and its specified equipment meets the same requirements. Without matched project inputs and quotations, neither option can be named the universal cost or reliability winner.
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