STS – Static Transfer Switch

Top Performance For High Power Critical Loads 

High-performance STS, up to 3000A with extremely short transfer time (<=4ms). Its overload capability enables its use also in heavy duty applications.Thanks to its internal redundancy and oversizing it guarantees maximum reliability.

Features: 

  • Voltage and frequency continuous monitoring and synchronizing
  • Extremely rapid automatic transfer (<= 4ms) thanks to continuous synchronisation, without sources connection
  • No transfer under short circuit after the STS, to keep up the current until the correct protections work
  • Continuous check of the SCR proper working and back feed protection
  • Dual bypass, one per source, to achieve total sources independence in case of maintenance
  • Maximum reliability thanks to redundant internal power supplies and cooling, plus oversizing of the neutral (2x)
  • Front access for easy maintenance
  • Bottom connection as a standard, top connection possible to simplify installation in any condition
  • Wide communication offer as a standard: dry contacts, RS 232, RS485
  • Use of Circuit Breakers, for best protection in all conditions

Options

  • Isolation Transformer
  • Plug-in breakers
  • Panel builder version
  • Additional dry contact board
  • 4-pole configuration
  • Operation without neutral

Applications

  • IT Applications
  • Single corded servers supply
  • Industry

Series Table

Model Rating Output Voltage Dimensions (WxDxH) mm Weight (kg)
STS100A-3p 100A 208/380/400/415/440/480 Vac 3-phase with neutral 820x835x1475 265
STS250A-3p 250A 208/380/400/415/440/480 Vac 3-phase with neutral 820x835x1475 290
STS400A-3p 400A 208/380/400/415/440/480 Vac 3-phase with neutral 820x835x1475 305
STS630A-3p 630A 208/380/400/415/440/480 Vac 3-phase with neutral 1220x860x1900 615
STS800A-3p 800A 208/380/400/415/440/480 Vac 3-phase with neutral 1220x860x1900 660
STS1000A-3p 1000A 208/380/400/415/440/480 Vac 3-phase with neutral 1220x860x1900 1000
STS1250A-3p 1250A 208/380/400/415/440/480 Vac 3-phase with neutral 2000x1000x2100 1450

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