UniSec & UniSec Air

Flexible and Reliable SF6 and SF6-Free Technology

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Modular air-insulated switchgear for all applications in secondary power distribution up to 24 kV

UniSec is an indoor air-insulated switchgear for medium voltage secondary distribution up to 24kV. It offers a broad portfolio of functional units and technical features and is suitable for a wide range of applications including industry, renewable energy plants, distribution and transformer substations, data centers, small generation systems, buildings and infrastructure, and smart grids.   

UniSec also offers a sulfur hexafluoride (SF6) free variant called UniSec Air. The new switchgear includes the switch disconnector and disconnector GSec Air. This new component has a dedicated vacuum interrupter for breaking capacity as the insulation medium with a global warming potential (GWP) of zero. The switchgear also contains a vacuum circuit breaker and is fully compliant with IEC standards and the EU F-gas regulation (EU) 2024/573.

UniSec and UniSec Air provide robust control and protection, metering, monitoring, and diagnostics suitable for various applications.



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UniSec features a modular design and is tested according to the latest IEC 62271-200 standard. UniSec offers a wide range of functional units and is thus able to provide the cost-efficient solution for all applications by combining different panel types. 

  • Removable and withdrawable SF6 and vacuum circuit breakers
  • Suitable and certified for installation in the most severe conditions like marine, areas with high seismic hazards, and low temperature environments

 

 

UniSec, SF6 (insulation medium)

Switch disconnector GSec with SF6 gas.
ABB’s complete transition to SF6 -free switchgear will be phased in line with our ambitious sustainability targets, evolving regulatory deadlines, market demand, and production capacity.

Leaflet UniSec Air.small

UniSec Air is designed with the same footprint, operations, and backward compatibility as the original UniSec switchgear with refined interface, facilitating integration into existing systems and extensions of the installed base.

  • GSec Air General purpose switch according to IEC 62271-103
  • GSec Air with dry air insulation medium with Global warming potential (GWP) of 0
  • Compact GSec Air with limited volume (<25 liters) 
  • Removable and withdrawable vacuum circuit breakers
  • Modular and flexible design allows for better accessibility to MV cable connection and simplifies installation, use, and maintenance

UniSec Air, SF6-free (insulation medium)

Switch disconnector and disconnector GSec Air with dry air and dedicated vacuum interrupter for breaking capacity.

 

Product scope

Click the arrow to learn more about product scope.

 UniSecUniSec Air
Max. rated voltage
up to 24 kVup to 24 kV 
Max. rated continuous current (busbar)up to 1250 Aup to 630 A,  up to 1250 A with LSC2B frontal withdrawable circuit breaker panel
Max. rated short-time withstand currentup to 25 kA up to 20 kA, up to 25 A with LSC2B frontal withdrawable circuit breaker panel
Insulation mediumSwitch disconnector GSec with SF6 gasSwitch disconnector  and disconnector GSec Air with dry air
StandardsIECIEC
OtherHigh duty circuit breakers with M2 (10000 operations) mechanical endurance  High duty circuit breakers with M2 (10000 operations) mechanical endurance 
ApplicationsBuilding and infrastructure, industry and transportation, data centers, distribution and renewables
Building and infrastructure, industry and transportation, data centers, distribution and renewables

 


Customer benefits

Click the arrows below to learn more about customer benefits.

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Flexible and modular design

  • Wide range of functional units equipped with switch disconnector, disconnectors, circuit breakers, conventional measuring transformers, current and voltage sensors, and protection relays - ideal for most indoor applications
  • Modular and flexible design streamlines installation, operation, and maintenance. Easy to install in electrical rooms, with A-FLR filters enabling efficient gas exhaust management
  • The flexibility of UniSec and UniSec Air allows for a high level of customization to meet demanding global requirements, and a user-friendly configurator simplifies the ordering process
  • Compatibility between UniSec Air and UniSec enables seamless integration into existing systems and facilitates expansion of the installed base
  • Equipped with a comprehensive range of monitoring and diagnostic features, providing continuous operational insights to optimize switchgear performance, reduce maintenance costs, and support preventive maintenance

ABB_picto_48x48_05_electrical_hazard_0166-Small-400x150

Safe and reliable

  • Internal arc classified with gas exhaust configured according to the application, allowing for evacuation either inside or outside the room
  • A wide range of mechanical and electrical interlocks to enhance operator safety
  • Service continuity solutions LSC2B/LSc2A/LSC2 are tailored for application needs, ensuring minimal service interruption


Guiding tool to select your ABB MV Switchgear

Configure your own switchgear

Do you need guidance on finding the best-suited MV switchgear for your application?

 

MV Switchgear Selector

Learn More

Leaflet UniSec Air.small
UniSec Air Technical Leaflet
Leaflet UniSec Air.small
UniSec Air Technical Catalogue
3D UniSec catalogue
UniSec - MV AIS for Secondary Distribution – Catalogue
UniSec - MV AIS for Secondary Distribution – Presentation
UniSec Pro offering tool

Insights

UniSec_Air_one pager
Video
UniSec Air MV Switchgear – the power to adapt

UniSec Air is a medium-voltage switchgear designed for secondary distribution up to 24 kV, 630 A, 20 kA. It contains GSec Air, a general purpose three-position switch disconnector or disconnector for frequent switching applications, with dry air as the insulation medium – that has a global warming potential (GWP) of zero and vacuum interrupter for breaking capacity. UniSec Air is fully compliant with IEC standards and the EU F-gas regulation (EU) 2024 / 573.
kv_campaignpage
White paper
Shaping Europe’s Energy Future: Key Transition Priorities

The transition to a net-zero economy means a profound transformation of the European energy sector. It means integrating renewable energy, modernizing aging infrastructure and applying digital technologies and automation for greater efficiency and reliability.
Making_the_Switch
Article
Making the switch from SF6 - power to adapt

A critical change is coming to Europe’s medium-voltage infrastructure. From January 2026, the use of SF6 in medium-voltage switchgear up to certain voltage levels will be restricted in the European Union. Andrea Estrada-Hein, EVP, Global Business Line Switchgear shares what you need to know — and why now is the time to act.

FAQ

How to choose between UniSec and UniSec Air?

The primary difference between UniSec and UniSec Air is the insulation medium of the main components:

  • UniSec has switch disconnector GSec with SF6 gas (sulfur hexafluoride) as the insulation medium, both with SF6 and vacuum circuit breakers alternative technologies
  • UniSec Air has switch disconnector and disconnector GSec Air with dry air as the insulation medium and vacuum circuit breakers with a global warming potential (GWP) of 0. It is fully compliant with the IEC standards and the EU F-gas regulation (EU) 2024/573.
Does UniSec Air SF6 free require more space?

UniSec Air has the same footprint as the original UniSec, with identical width, depth and height.

Can UniSec Air be used for an extension of an already installed UniSec switchgear?

Yes, UniSec Air is fully compatible with UniSec switchgear. 

When is the disconnector used instead of the switch disconnector for UniSec Air?
For UniSec Air the disconnector is used in the units in combination with circuit breaker.

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