Woodward DTSC-200-55B Generator Set Transfer Switch Controller

Product Overview

The Woodward DTSC-200-55B​ (Woodward part number 8440-1868) is a microprocessor-based Automatic Transfer Switch (ATS) controller designed to manage automatic source transfer in critical three-phase AC power systems. It continuously monitors the voltage and frequency of two power sources—typically utility mains and a generator set—and automatically transfers the load to the healthy source when the preferred source fails or deviates outside acceptable limits. As a member of the Woodward DTSC-200 family, the Woodward DTSC-200-55B​ is equally capable of Utility-to-Generator, Generator-to-Generator, and Utility-to-Utility configurations, making it a versatile control solution for both new ATS builds and retrofit installations.

The controller supports open, delayed, and closed-transition transfer modes, including synch-check logic for closed transition. This means a load can be transferred with a brief make-before-break overlap (under 100 ms as standard, extendable via discrete input) or through a fully interlocked break-before-make sequence, depending on the application and the tolerable level of transient disturbance. True-RMS three-phase voltage and current sensing, combined with integrated measurement and protection functions, allow the Woodward DTSC-200-55B​ to make transfer decisions based on actual power quality rather than simple on/off detection.

High-end programmable features come standard: transfer inhibit, source priority selection, load shed and load restore, motor load disconnect, elevator pre-signal, and engine exerciser timers. Together with its rugged industrial construction and panel-mount form factor, these capabilities make the Woodward DTSC-200-55B​ a complete, cost-effective intelligence package for mission-critical power switching where reliability, safety, and service continuity are non-negotiable.

Technical Specifications