closed transition

While most transfer switches are equipped with basic features that make them suitable for simple installations, larger or more complex projects often require additional features to meet special requirements. One such special requirement is the need to protect sensitive equipment whenever building loads are switched between two live, un-synchronized, power sources. How exactly does a proposed transfer switch execute a transfer between the normal source and the emergency source, and what effect will the transfer sequence have on the connected loads? Learn the key differences between open, delayed and closed-transition automatic transfer switches, and how to specify the right equipment.