Dual power automatic transfer switch models WATSG800A/320A/4H and WATSG800A/400A/4H deliver reliable, automated transfer between two power sources to maintain continuous power supply and protect downstream equipment. Key benefits Continuous power availability: automatic detection and fast transfer between primary and backup sources minimizes downtime and maintains service continuity. Safety and fault prevention: mechanical and electrical interlocking prevents simultaneous connection of both sources and avoids short circuits; multiple protection functions help isolate faults and protect connected equipment. Durable, lowmaintenance design: stable mechanical layout and smooth contact switching reduce wear and extend service life, lowering long term maintenance needs. Flexible and expandable: modular architecture supports a range of functional modules for monitoring, control, and to meet different site requirements and improve transfer performance. Clear compatibility and sizing: available models WATSG800A/320A/4H and WATSG800A/400A/4H to match different installation capacities and system configurations. Core functions and performance Dual power automatic transfer switch type for automatic failover between two independent power sources. Automatic detection of source availability and automatic switching logic to restore the preferred power source when available. Mechanical interlock plus electrical interlock for safe sequence control of contacts and prevention of backfeed. Multiple protection functions to manage abnormal conditions and protect both the switch and downstream loads. Smooth contact operation and robust switching mechanism designed for frequent operation and long service life. Modular functional slots for adding monitoring, control, or auxiliary functions without major rewiring. Size and compatibility Size reference and model options: WATSG800A/320A/4H; WATSG800A/400A/4H. Designed to integrate with standard dual source setups such as utility and generator supply, or two independent feeder lines. Suitable for use with common electrical distribution equipment; supports modular expansion to fit site specific control and monitoring needs. Typical applications Data centers and server rooms where uninterrupted power is required to avoid data loss and service interruptions. Commercial and industrial facilities that need automatic transfer between utility power and onsite backup generators to ensure continued operations. Telecommunications sites and network hubs where reliable power switching preserves connectivity and protects sensitive electronics. What makes it stand out Combines automated, fast transfer logic with mechanical and electrical interlocking for safer switching. Modular design allows straightforward functional upgrades, making it adaptable as system needs change. Engineered for smooth contact switching and long operational life to reduce lifecycle maintenance and replacement costs. Specifications summary Switch type: Dual power automatic transfer switch. Models: WATSG800A/320A/4H; WATSG800A/400A/4H. Key features: automatic detection and switching, mechanical and electrical interlocking, multiple protection functions, modular expandability, durable switching mechanism. If you need a reliable, safety oriented automatic transfer solution that supports modular expansion and minimizes downtime, these models provide the core functionality and durability required for critical and commercial power systems.