Model and size: WATSG400/4A Key benefits Continuous power availability: automatic detection and switching between power sources maintains supply continuity when the primary source fails. Reduced risk of improper switching: mechanical and electrical interlocking prevents simultaneous connections that could cause a short circuit; multiple protection functions monitor and protect the switching process. Durable operation: stable mechanical design and smooth contact switching minimize wear and extend service life. Flexible deployment: modular architecture supports a variety of functional modules for easy expansion and to meet applicationspecific requirements and improve conversion rates. Core functions and attributes Function: Automatic transfer switching with automatic source detection and fast, controlled changeover. Protection: Mechanical and electrical interlocking plus builtin protective functions to manage and isolate switching events. Modularity: Supports multiple functional modules for added features or tailored configurations without major hardware changes. Performance: Designed for smooth contact operation and consistent switching behavior to support frequent or critical transfers. Size and model: WATSG400/4A — designed to fit installations specified for this model designation. Compatibility: Modular design enables integration with common power distribution and backup systems where an automatic transfer solution is required. Practical application scenarios Commercial building power management: Maintain uninterrupted power for lighting, elevators, and essential services by automatically switching to backup sources during outages. Industrial continuity protection: Protect production lines and control systems by providing fast, reliable transfer between primary and standby supplies, with interlocking to prevent cross feeds. Server rooms and equipment racks: Integrate into backup power schemes to reduce downtime during utility interruptions while allowing future expansion through functional modules. Why choose WATSG400/4A Provides automatic, repeatable switching to keep critical loads powered. Designed to limit improper connections through interlocking and protective functions. Modular and expandable to match evolving operational needs without full system replacement. Engineered for longevity with smooth contact switching and a stable mechanical design.