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 24 kV. 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 load break switch (LBS) and disconnector GSec Air. This new component has a shunt 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 and GB specifications. The switchgear, with corrosive and pollution-resistant materials, is certified for installation in the most severe conditions like marine, areas with high seismic hazards, and low temperature environments. 

  • 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 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.

  • Compact GSec Air with limited volume (<25 liters) 
  • Removable and withdrawable vacuum circuit breakers
  • Global warming potential (GWP) of 0
  • Modular and flexible design allows for better accessibility to MV cable connection and simplifies installation, use, and maintenance

UniSec, SF6 (insulation medium)

Load break switch (LBS) 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. 

 

UniSec Air, SF6-free (insulation medium)

Load break switch (LBS) and disconnector GSec Air with dry air and shunt 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 mediumLoad break switch (LBS) GSec with SF6 gasLoad break switch (LBS) and disconnector GSec Air with dry air
StandardsIEC, GB/DLIEC
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 LBS and disconnector, circuit breaker, conventional measuring transformers, current and voltage sensors, and protection relay solutions, making it suitable for most indoor applications.
  • Modular and flexible design simplifies installation, use, and maintenance. Easy installation inside electrical rooms is facilitated with A-FLR filters for gas exhaust.
  • UniSec and UniSec Air flexibility provide a high level of customization to meet global demanding requirements and is easy to order thanks to user friendly configurator tools.
  • Backward compatibility between UniSec Air and UniSec allows for easy integration into existing systems and extensions of the installed base.

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Safe and reliable

  • Internal arc classification: available with various gas exhaust variants for enhanced safety.
  • Service continuity solutions: LSC2B/LSC2A/LSC2 tailored to application needs, ensuring minimal service interruption.
  • High operator safety featuring an internal arc-proof design and a wide range of mechanical and electrical interlocks to enhance operator safety.
  • Fast and dependable delivery times with pre-engineered just to install (JTI) switchgear solutions.

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Automated Solutions

  • Equipped with a wide range of monitoring and diagnostic features for continuous operational insight. This supports optimal switchgear operations and helps to reduce maintenance costs.
  • Robust control and protection are available with Relion relays portfolio with IE61850 protocol communication to meet different application requirements.
  • As an alternative to traditional transformers, these units can be outfitted with sensor technology for current and voltage measurement

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

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 LBS GSec with SF6 gas (sulfur hexafluoride) as the insulation medium, both with SF6 and vacuum circuit breakers alternative technologies
  • UniSec Air has LBS 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. 

Learn More

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

Related offering

Compact Substation
Medium voltage indoor switches and disconnectors
Medium Voltage circuit breaker
Relion protection relays
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