STATIC TRANSFER SWITCH (STS)

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.