What Is Static Transfer Switch?_
An STS uses solid-state components (typically silicon-controlled rectifiers or thyristors) to transfer the connected load from a primary power source to a secondary source within a few milliseconds, preventing disruption to sensitive equipment. It monitors source quality (voltage, frequency) and initiates transfer only when the primary source fails or deviates outside acceptable thresholds. Unlike electromechanical transfer switches, the STS has no moving parts, enabling faster switching and higher reliability for critical loads.
Technical Details
The STS is rated for the full load current of the rack or row it serves, with input feeds from two independent utility or UPS sources. Transfer time is typically under 4 ms, which is within the hold-up time of most server power supplies. The unit includes bypass circuits for maintenance and manual override, and it communicates via SNMP or Modbus for monitoring. Installation requires proper grounding and coordination with upstream breakers to avoid nuisance trips.
How Leviathan Systems Works with Static Transfer Switch
In Leviathan Systems field work, the STS is installed in the power distribution path between the facility’s dual-bus power and the rack-level PDUs, often as a 1U or 2U chassis in the rack. We verify correct input phasing, load balance, and failover testing during commissioning to ensure GPU clusters have uninterrupted power during source transfers.
Related service
GPU Rack Assembly & Rack-and-Stack →