Specifications
Product Family
Eaton PDI Static Transfer Switch (STS) and WaveStar TFA Static Transfer Switch
Current Ratings
WaveStar TFA: 250 A to 1,200 A. Eaton PDI STS: up to 2,000 A, 3-pole
Function
Automatic and manual transfer of a critical load between two independent AC sources
Transfer Mechanism
SCR / solid-state static switching — no moving parts in the primary transfer path
Synchronization
Volt-second synchronization for transfer within the source tolerance window
Controls
Dual redundant display and control — a single control failure does not block a transfer
Enclosure
Compact, modular enclosure; front-accessible service
Operating Temperature
0 to 40 degrees C
Altitude
Up to 5,000 ft above sea level without de-rating
Matching PDUs
Line-and-match architecture with Eaton PowerHub 2 and PowerPak 2 PDUs for a single visual and electrical family
Redundancy Role
Second-level redundancy downstream of dual UPS systems — protects against a UPS failure, not just a utility outage
Quality Process
Rigorous five-step quality process per Eaton PDI (formerly Power Distribution, Inc.)
Monitoring
Source and load status at the panel; dry contacts and network options for upstream BMS/DCIM
Maintenance
Manual bypass path allows source or controller service without dropping the critical bus
Certifications
Built and tested to UL standards for IT power distribution equipment (UL 891 / UL 1008 class)
Typical Load
AI and HPC white space fed from A/B UPS pairs; colocation critical buses; UPS output distribution
Overview
A static transfer switch is the second layer of redundancy in a data centre. The UPS protects the load from a utility outage; the STS protects the load from a UPS failure or a UPS maintenance window. It sits between two independent sources and moves the critical bus across in milliseconds when the preferred source drifts out of tolerance.
The Eaton PDI line covers both scales. The WaveStar TFA runs from 250 A to 1,200 A in a compact modular enclosure and is dimensioned to sit line-and-match with PowerHub 2 and PowerPak 2 PDUs, so a whole distribution row reads as one product family. The Eaton PDI STS extends to 2,000 A in a 3-pole configuration for larger critical buses.
Volt-second synchronization keeps the transfer inside the source tolerance window so downstream power supplies are not stressed, and the dual redundant display and control means losing one controller does not strand the switch in its current state. Altitude is rated to 5,000 ft without de-rating, which covers most tier-2 and tier-3 sites.
Key Benefits
Millisecond solid-state transfer with no mechanical contactor in the main path. Dual redundant controls so one failure cannot block a transfer. Volt-second synchronization protects downstream supplies. Line-and-match with PowerHub 2 / PowerPak 2 PDUs. Manual bypass for service without dropping the bus. 250 A to 2,000 A across the PDI family.
Applications
AI/HPC white space on A/B UPS pairs; colocation critical buses; UPS output distribution and maintenance bypass; data centre second-level redundancy; laboratory and fab critical power.
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