The TECNED STS (SF/D) series is a high-performance Static Transfer Switch solution engineered for critical applications requiring uninterrupted power continuity, fast transfer performance, and maximum operational reliability. Available with single-phase input and output configurations, the STS (SF/D) series offers current ratings from 25A to 500A for a wide range of industrial and critical power applications.

Designed to ensure secure load transfer between independent power sources, the STS (SF/D) series can be supplied as 1-pole or 2-pole static switching systems to meet customer-specific requirements for safety, redundancy, and system availability. Standard functions include source selection, automatic transfer control, source locking, input voltage monitoring, and alarm supervision for out-of-tolerance conditions and general system status.

The ST(D) model features an advanced digital controller with integrated LCD display for real-time system monitoring, parameter configuration, diagnostics, and event/alarm logging, providing enhanced supervision and simplified maintenance.