Static Transfer Switch (STS)

Features & Benefits:

  • Selectable voltage limits
  • Three redundant power supplies
  • Fail safe CMOS logic
  • Easy to install and to operate
  • Redundant cooling
  • Surge protection
  • Blocked transfer in case of short circuit
  • Manual bypass
  • Dry contacts
  • Rackmounted models
  • User  friendly control panel
  • Neutral dimensioned for 200%

Static Transfer Switches (STS) are designed to transfer the supply between two independent AC power sources. Unlike traditional automatic transfer switches (ATS), a static transfer switch provides a fast load transfer (typically ¼ of cycle), which ensures uninterrupted operation of sensitive electronic equipment.

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Single Phase

STS-1 Series (25-85 Amperes)

poweredge-sts-1

The GE Zenith STS-1 Series static transfer switch supplies critical loads with a choice between two available sources of electrical power. By continually monitoring power quality, the STS-1 switch automatically transfers to an alternate source without interruption of power to even your most sensitive critical loads. With a sense and transfer time of less than 6ms, the STS-1 represents the highest performance power switching solution available.

Features & Benefits:
  • Source Default Select option enables manual selection to determine which source the switch will normally run on if both sources are present.
  • Solid state SCR’s are connected in bridge configuration, effectively doubling their voltage rating. SCR’s switch without arcing, voltage, transients or significant current surges.
  • LEDs are provided to indicate source and transfer logic status for remote indication.
  • No Load Transfer Inhibit feature that prevents unsequenced transfers if the load-sensing interlock is not maintained.
  • Surge & noise suppressors installed across AC inputs. RFI-filtered redundant logic power supplies
  • Manual Transfer feature
  • Transfers load between the preferred and alternate sources  regardless of phase relationship
  • Restores voltage fast enough to perform a seamless transfer while preventing load malfunction
  • Performs transfer efficiently without causing arcing, contact, bounce, or abnormal current transients
  • Virtually eliminates contact wear and maintenance
  • Connects electrical loads to virtually any existing AC sine wave source
Three Phase

STS-3 Series (150-1600 Amperes)

The GE Zenith STS-3 Series static transfer switch supplies critical loads with a choice between two available sources of electrical power. By continually monitoring power quality, the STS-3 switch automatically transfers to an alternate source without interruption of power to even your most sensitive critical loads. With a sense and transfer time of less than 4ms, and the industry’s best communication package, the STS-3 represents the highest performance power switching solution available.

Features & Benefits:
  • Matching Solutions for Output Power Distribution
  • Matching MDU Series cabinet can be mounted on the output of the STS unit
  • Flexible output distribution – subfeed circuit breakers and/or panelboards
  • On STS/MDU applications, Low PDU Transformer Inrush Current on STS Transfers
  • Volt-Second-Synchronization (VSS) feature limits inrush to 1.5X
  • Considerable Internal Redundancy
  • System Control Redundancy
  • Component Redundancy
  • Bypass & Breaker Isolation Redundancy
  • MTBF exceeds 2,000,000hrs