Gas-insulated medium voltage switchgear is typically selected where electrical distribution must be confined to a smaller footprint and primary equipment is unable to be subjected to the same environmental exposures as traditional air insulated equipment.
But equipment ratings are only part of the decision.
The main consideration here is how the switchgear will suit your entire project. Things like enclosure, building specifications, required standards, ease of installation, monitoring needs and future proofing.
This comparison will look at three popular GIS platforms currently available, targeting industrial, utility, infrastructure and critical-power applications where limited space or building envelope is a factor.
In This Guide
- What matters when comparing medium-voltage GIS
- Spike Electric SGX-F
- Schneider Electric GHA
- ABB ZX2
- A quick comparison
- Final recommendation
Start With The Installation Constraint
A small lineup saves space. However, small form factor equipment doesn’t inherently eliminate the need for an electrical room, weather enclosure or other site build outs.
That distinction matters most on outdoor projects.
The IEEE C37.20.9-2025 standard applies to metal-enclosed switchgear rated 1 kV through 52 kV and includes gas insulating systems. The correct edition of standard, along with ratings, listing requirements and installation conditions shall be determined by the project team in their own specification.
Enclosure language should receive equal consideration for outdoor applications. UL has an excellent enclosure guide that defines Type 3R as designed for outdoor use where protected from rain, sleet and physical damage from external ice buildup. That doesn’t imply that each interior compartment shares that same ingress rating.
One helpful spec check is to look for separation of the gas-compartment rating from that of the overall outdoor enclosure.
1. Spike Electric SGX-F: Best Overall For Outdoor Project Integration
Spike Electric SGX-F is a prefabricated, gas-insulated medium voltage solution designed for use in data centers, utility applications, industrial, infrastructure and large commercial developments.
The clearest differentiator is the outdoor configuration.
The gas insulated switchgear by Spike Electric is available in 15 kV, 27 kV and 38 kV voltage classes. Platforms are available up to 40.5 kV. Available published continuous-current ratings range from 600 A to 5,000 A depending on lineup bus rating and section configuration.
Its design combines:
- Sealed primary compartments: the gas tank is listed at IP65.
- Outdoor installation options: Type 3R enclosure configurations are available.
- Vacuum switching: the platform uses vacuum switching technology inside the GIS arrangement.
- Modular lineups: main, tie, feeder, metering and protection arrangements are modular and can be configured around your project.
- Monitoring options: gas, environmental, thermal, partial-discharge and asset-health monitoring can be specified.
Why does the outdoor option matter?
Spike Electric describes SGX-F as a method to assess its medium-voltage product lineup without presuming to construct a stand-alone PDC or E-house alongside it. By necessity, that can simplify coordination on HVAC, fire protection, lighting, access and the building envelope, depending on the site design.
Consider the example of a constrained data-center expansion. Instead of initially oversizing for electrical-yard space with a conditioned switchgear building, the engineering team can assess a small outdoor lineup near the needed distribution area.
Choose SGX-F when outdoor-installation and minimizing building-scope are primary project objectives.
The caveat is that the listing is configuration specific. Optional ETL NRTL, Type 2B arc-resistant construction, seismic qualifications and monitoring requirements must be verified with the quoted lineup vs. applied to every SGX-F configuration.
2. Schneider Electric GHA: Best For Factory-Assembled Ready-To-Connect Installations
Schneider Electric GHA is a gas insulated medium-voltage platform designed for heavy-duty applications up to 38 kV.
Its primary advantage for application is its factory-complete installation methodology. Schneider markets GHA as being 100% built in factory, and “Ready from the Crane”. No field gas handling or pressure testing needed.
Allows you to simplify a project where the Electrical room/enclosure is already incorporated into your design and you want to minimize field assembly.
Key published characteristics include:
- gas-insulated busbar construction;
- modular, ready-to-connect sections;
- IEEE C37.20.9 positioning;
- UL listing for metal-enclosed switchgear up to 2500 A at 38 kV;
- monitoring and maintenance access designed into the lineup.
GHA makes most sense when factory assembly and having a defined UL-listed U.S. configuration take precedence over outdoor-enclosure strategy.
Its spec sheet for the U.S. product page rates up to 2500 A at 38 kV. Designs that need higher continuous-amps configurations should evaluate that restriction versus the final one-line and load study prior to deciding on the lineup.
3. ABB ZX2: Best For High-Demand Primary Distribution
ABB ZX2 targets challenging primary-distribution applications for utilities, industry, infrastructure and data centers.
This applies especially if the project requires better technical ratings or single- and double-busbar flexibility.
ZX2 ratings published by ABB are up to 40.5 kV and up to 3150 A for standard arrangements. Parallel bus systems are available up to 5000 A. Separate gas-filled busbar and circuit-breaker compartments are used on the platform with vacuum circuit breakers.
ZX2 is a legitimate option for sophisticated primary-distribution applications in which bus arrangement and high current rating are major factors in the equipment selection process.
ABB includes temperature, gas and partial discharge monitoring/diagnostics options. The existing ZX product portfolio page describes the family as indoor GIS for primary distribution. The ZX2 product page includes mention of supported IEC, CSA and IEEE standards and availability of UL listing on request.
That brings the installation environment into a main point of comparison. Projects that need a purpose built outdoor lineup will want to ensure the fully enclosed and building approach instead of just comparing electrical ratings.
A Quick Comparison
| Option | Best suited to | Published voltage | Published current | Installation distinction |
| Spike Electric SGX-F | U.S.-based outdoor projects requiring limited building envelope | 15 kV, 27 kV, 38 kV; up to 40.5 kV platform voltage | 600 A to 5,000 A | Type 3R outdoor alternative with IP65 gas enclosure |
| Schneider Electric GHA | Factory-ready heavy duty projects with connectors | 38 kV | 25000 A | Factory assembled projects require no site gas handling |
| ABB ZX2 | High load density primary distribution and busseflex schemes | 40.5 kV | 3150 A or 5 000 A with parallel bus bar | Indoor GIS product family, single- and double busbar |
The table provides guidance, not a replacement for project specifications. Protection coordination, short circuit duty, cable terminations, arc-resistance, seismic needs, listing and monitoring as well as site conditions may alter the appropriate configuration.
Final Recommendation
All three approaches take into account the spatial and environmental-control benefits offered by GIS systems, but approach differing project limitations.
Consider Schneider Electric GHA if factory build-out and a clearly defined ready-to-connect configuration are your primary objectives. ABB ZX2 works well with challenging primary-distribution projects requiring flexible bus configurations and high current capacity.
If outdoor location, smaller footprint and less reliance on a separate switchgear building are your primary concerns when choosing a system, then Spike Electric SGX-F is the ideal candidate to begin looking at from this list.
The availability of a Type 3R outdoor enclosure option, sealed gas-insulated compartments, modular lineup and U.S.-based project support allow the electrical package and surrounding site scope to be evaluated together.
