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Product Family

Liebert EXL S1 UPS, 300-1250 kW

Liebert® EXL S1 delivers secure power while providing first class load protection and maximum energy saving for medium-large data centers and mission critical applications.

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Best Suited For:
  • Banking, Financial and Insurance
  • Data Center/Colocation/Hosting
  • Healthcare
  • Transportation
Warranty: This product is approved by the ETL (Energy Technology List)
Tools & Selectors
Select, compare, or configure UPS systems and models
UPS Selector
Interactive product selector for single-phase UPS
UPS/Battery Upgrade Services
Explore options to maintain Liebert® GXT & Liebert® PSI UPS
Liebert® EXL S1 360 Interactive Experience
Visualize and explore key features and benefits of the Liebert® EXL S1 UPS

Liebert® EXL S1 is a monolithic product that features a transformer-free design with a full IGBT three-level topology, providing extraordinary features including a double conversion efficiency of up to 97% plus intelligent paralleling to optimize efficiency at partial load, thus achieving superior running cost savings. Furthermore, its higher power density in a minimum footprint optimizes the availability of IT space and reduces related costs. This product is approved by the ETL (Energy Technology List) for UK customers. Under the Enhanced Capital Allowance (ECA) scheme, ETL listed products can claim back 100% first year capital allowance.


Extraordinary double conversion efficiency up to 97%
Intelligent ECO mode efficiency above 99%
Intelligent paralleling feature optimizes efficiency at partial load
Maximized active power at unity power factor
Compact footprint for optimum space utilization
Backward compatibility with previous 80-NET generation
 Under the Enhanced Capital Allowance (ECA) scheme, ETL listed products can claim back 100% first year capital allowance  


Liebert EXL S1 data center UPS benefits and features
Transformer-free design
Full IGBT three-level NPC2 topology
Excellent input performances:
- PF > 0.99
- THDi < 3%
 Automatic output power upgrade of up to +10%
Output PF up to one and symmetrical respect to zero
Three and four wire electrical compatibility
Parallel up to 8 units
Centralized and distributed parallel capabilities
Intelligent paralleling
Seismic compliance 
VertivTM LIFE TM Services native  

*To see model-specific downloads, you will need to go to the model-specific product page by selecting the model name in the specifications chart above.

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Products Support Contacts

Showing contacts for Virginia, 20149, USA Change
Vertiv (Liebert Services)
+1 800 543 2378
610 Executive Campus Drive Westerville Ohio 43082 USA
Product areas of focus: Uninterruptible Power Supplies (UPS), Power Distribution, Thermal Management, Integrated Solutions, Racks and Containment
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