STS(Static Transfer Switch), is an automatic static switching equipment designed to transfer critical loads between two independent AC power sources without interruption or with a transfer time of less than a cycle (20ms).

What is the difference between a static switch and an automatic transfer switch?

A Static Transfer Switch (STS) utilizes a static electronic component (SCR), which permits a transfer in less than four milliseconds (1/4 of an electrical cycle). ... On the other hand, an Automatic Transfer Switch (ATS) relies on moving parts, and makes a significantly slower transfer than Static Transfer Switches.

What type of switch is a transfer switch?

There are two types of transfer switches: manual and automatic transfer switches. This refers to the way in which the switch is turned on and off during use.