UniSec & UniSec Air

Flexible and Reliable SF6 and SF6-Free Technology

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 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.

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

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	UniSec	UniSec Air
Max. rated voltage	up to 24 kV	up to 24 kV
Max. rated continuous current (busbar)	up to 1250 A	up to 630 A, up to 1250 A with LSC2B frontal withdrawable circuit breaker panel
Max. rated short-time withstand current	up to 25 kA	up to 20 kA, up to 25 A with LSC2B frontal withdrawable circuit breaker panel
Insulation medium	Load break switch (LBS) GSec with SF6 gas	Load break switch (LBS) and disconnector GSec Air with dry air
Standards	IEC, GB/DL	IEC
Other	High duty circuit breakers with M2 (10000 operations) mechanical endurance	High duty circuit breakers with M2 (10000 operations) mechanical endurance
Applications	Building and infrastructure, industry and transportation, data centers, distribution and renewables	Building and infrastructure, industry and transportation, data centers, distribution and renewables

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.