Power Transfer Switches

Liebert STS2 StaticTransfer Switch

Provides automatic switching between two different AC power sources such as different UPS systems.

Best Suited For
  • Data Center/Colocation/Hosting
  • Banking, Financial and Insurance
  • Government
  • Healthcare
  • Retail and Wholesale
  • Education
One Year Limited Warranty Against Defects in Material and Workmanship


The Liebert STS2 from Vertiv is making it easier to protect your critical equipment by giving your single cord loads the reliability of dual cord power or by providing added redundancy to your dual cord devices. With a single, space-saving unit, the Liebert STS2 static transfer switch provides automatic switching between two different AC power sources. The Liebert STS2 is available in 250A, 400A, 600A and 800A systems, in both 60Hz and 50Hz. Multiple input voltages are available. Designed for use in dual-bus power applications, this solution combines fast switching between AC power sources, power isolation, monitoring and grounding into a single package.


*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.


Automatic switching for dual bus loads
Requires only front access for easy installation and maintenance
Offers primary or secondary side switching 
100% rated, fuseless design


{{eybullet}}Operates efficiently 
{{eybullet}}Front access to all components provides simplifies installation and maintenance, and reduces amount of floorspace required for access.
{{eybullet}}Internal CANBUS protocol: high-bandwidth communication between system components via twisted-pair cables.
{{eybullet}}Triple redundant logic with dual power feeds.
{{eybullet}}Standard on-unit monitoring and optional centralized monitoring capability provide continuous system visibility.
{{eybullet}}When applied as primary side switching, cost are lower due to requiring only one power distribution unit, a lower current due to 480V vs. 208V, and lower installation and wiring cost. 


Sales In USA Change Location
ASCO Power Technologies (Maryland, Southern Delaware, Washington DC and VA
Email Contact 571 313 8041 Fax 703 342 0391
12310 Pinecrest Road Suite 204 Reston Virginia 20191
Product areas of focus: Power Transfer Switches, Paralleling Switchgear, Power Control and Monitoring
Support Change Location
ASCO Services, Inc.
50 Hanover Road Florham Park New Jersey 07932
Product areas of focus: Power Transfer Switches, Paralleling Switchgear, Power Control and Monitoring


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