Static Transfer Switch(STS) are automatic static switching equipments designed to transfer electric loads between two independent AC or DC power sources without interruption.
Static Transfer Switch is an electrical device that allows instantaneous transfer of power sources to the load. This superior switching time(4ms) means that if one power source fails the STS switches to the back-up power source so quickly that the load never recognizes the transfer made.
Fast-acting STS are increasingly being applied to protect large loads and entire facilities from short-duration power disturbances. These products use solid-state power electronics or “static” switching.
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