Specifications General Product Type: Automatic Transfer Switch (ATS) Model: WATSNA‑63/20.4CBR Configuration: 3P+N (three phases + neutral) Mounting: Fixed installation in distribution panels or switchboards Application: Automatic switching between primary and secondary power sources Electrical Ratings Rated Operational Voltage (Ue): 380–400 V AC, 50/60 Hz Rated Current: 20 A Number of Poles: 4 (three phases + neutral) Rated Insulation Voltage: 440 V AC Rated Impulse Withstand Voltage (Uimp): 8 kV Short‑Circuit Withstand Capability: 17 kA peak Performance & Functions Automatic Transfer: Detects loss of primary supply and transfers load to secondary supply Manual Override: Allows manual control of source selection Status Indication: Visual indicators for source position Fault Handling: Includes interlock and alarm outputs Control Interface: Supports external control and remote monitoring Mechanical & Environmental Design: Modular housing for panel integration Operating Environment: Indoor use in electrical distribution environments Connections: Screw or clamp type terminals Mounting: DIN‑rail or panel mount compatible