Static Transfer Switch (STS)

Servers rooms
Data Centers
R&D Laboratories
Automated Manufacturing
Industrial applications

Static Transfer Switch (STS) is an electrical device that switches between two power sources without delay. Digital static transfer switch has provision to connect two power sources at input out of which is power source is default while other will be standby. In case of interruption in default power source, STS will switch to standby power source instantaneously and visa versa so that your load will not observe any power interruption.

Major advantage of Static Transfer Switch over traditional Automatic transfer switch is it's fast acting capacity. Automatic Static Transfer switch uses solid state power electronics which is static switching devices such as SCR & IGBT hence it is also called as Solid state static transfer switch. While traditions Automatic Transfer switch (ATS) uses electromechanical switching.

Based on Current & Voltage capacity of STS, it is classified as Low Voltage STS (LV-STS) & Medium Voltage STS (MV-STS). LV-STS have current rating from 50A to 4000A & voltage up to 600V.

Some of the important features of our STS are as follow:

  • Increased power quality
  • Easy monitoring all parameters on LCD display
  • Fast microcontroller. Power blackout protection
  • Automatic static switching. Remote monitoring of input power sources
  • Easy static and mechanical transfer between separate input sources
  • Remote management of power events. Power event logging
  • Advanced RS232 communication features. DRY contact alarm interface
  • Password protected login system from remote site (timed Access)
  • 2 redundant power supplies form electronic boards (hot swappable)
  • Easy front access to all components inside of the STS
  • Second protection cover on live circuits which prevents electrical shock
  • 3 positioned Maintenance bypass switch which prevents cross currents between input sources
  • User adjustable parameters by entering a password. Built in real time clock
  • history (with their date and time)
  • Automatic transfer test from a remote site or using front panel. Front panel Lamp test
  • External emergency shutdown (EPO) input
  • Hot plug construction during maintenance bypass
  • High current output tolerant up to 1000%.
  • Temperature sensor inside the Cabinet
  • Fast voltage black-out circuit. Reputed brands of STS are GE, EATON, MGE, APC, SOCOMEC, INFORM, Powerware.
  • Input phase balance and phase sequence fault detect circuit.
  • Adjustable Input source frequency lower/upper limits.