APC UPSILON STS630 4-Pole 380-400 V 1900 mm | Static Transfer Switch

Keep essential loads on a stable power path with the APC UPSILON STS630 static transfer switch. Designed for 4-pole, 380-400 V installations and a 1,900 mm enclosure height, it fits environments where transfer speed, electrical discipline, and cabinet-level integration matter. This is the kind of equipment selected for infrastructure that cannot tolerate casual power handling. Static transfer switching is used to move critical loads between sources with minimal interruption, helping preserve continuity in facilities built around redundancy and controlled distribution. The 4-pole configuration supports more complex electrical architectures, while the tall enclosure format reflects a deployment model intended for dedicated power rooms and engineered electrical spaces. For teams comparing options, the value is in the specificity: APC build quality, a defined voltage range, and a form factor aligned to high-availability power distribution. It is a serious component for serious power paths, where the cost of a weak transfer layer is far greater than the cost of the hardware itself.