The Schneider Electric WATSN200/4A is a 4-pole automatic transfer switch (ATS) rated for 200A and 400V operating at 50/60Hz frequency. This ATS provides automatic switching between two power sources, ensuring continuous power supply in the event of a failure of the primary source (e.g., mains power). It is commonly used in industrial, commercial, and critical power applications where uninterrupted power is required.