APC UPSILON STS400 3-Pole 380-415 V 1,900 mm | STS, Power Distribution

Keep critical loads on line when power sources change. The APC UPSILON STS400 static transfer switch is built for environments that require dependable source selection across 380-415 V infrastructure. Its 3-pole design supports controlled transfer in three-phase power architectures, helping protect downstream equipment from interruption during maintenance, source instability, or planned switching events. This model is suited to facilities that cannot tolerate downtime at the distribution layer. In dual-source power designs, a static transfer switch adds a layer of control between upstream feeds and sensitive loads, allowing teams to maintain service continuity without relying on manual intervention. The 1,900 mm enclosure height supports integration into larger electrical or data center power layouts where space, access, and cable routing matter. For infrastructure teams, the value is in precision and confidence. Rather than overbuilding with oversized alternatives, the STS400 is sized for serious power transfer requirements while staying aligned to the electrical profile of the installation. It is a practical choice for operators who need stable source management, clear fitment, and APC-backed power distribution hardware for critical environments.