Product overview A line of automatic transfer switch units designed to maintain continuous power supply and protect electrical systems. Models cover a wide range of ratings and sizes to match different mains and backup generator configurations. Available models WATSN100/32/4A WATSN100/40/4A WATSN100/50/4A WATSN100/63/4A WATSN100/80/4A WATSN100/100/4A WATSN160/160b/4A WATSN250/250/4A WATSN630/400/4A Key benefits Ensure power continuity: automatic detection and switching maintain supply continuity between primary and backup sources, reducing downtime. Enhanced safety and reliability: combined mechanical and electrical interlocking prevents simultaneous connection of two sources and reduces the risk of short circuits. Long service life: stable structural design and smooth contact switching provide durable operation and reduced wear. Flexible functionality: modular architecture supports a variety of functional modules for expansion and to meet site specific requirements and improve conversion performance. Suitable for multiple system sizes: model range covers common low voltage distribution applications and allows selection based on current rating and system needs. Main features Automatic detection and switching logic for seamless source transfer. Mechanical interlock plus electrical interlock for positive isolation between sources. Multiple protection functions to guard against unsafe switching conditions. Smooth, reliable contact operation designed for frequent switching and extended lifecycle. Modular design permitting additional control or monitoring modules to be fitted without major rework. Compact and scalable model options to match installation space and load requirements. Typical applications Data centers and server rooms Manage transfer between utility power and backup generator or UPS to protect critical IT equipment. Commercial and office buildings Maintain lighting, elevators, and essential systems during utility interruptions. Industrial facilities and manufacturing plants Provide controlled transfer for production lines, motors, and control systems to minimize process disruption. Performance and compatibility notes Intended for automatic transfer of low voltage power sources, including utility mains and standby generators. Model selection should match the system current rating and switching duty. The available models provide stepped capacity options from smaller distribution circuits up to larger supply feeders. Modular capability allows integration of additional controls or interface functions to adapt to site specific monitoring and control schemes. Installation and maintenance Designed for reliable operation with straightforward modular upgrades. Mechanical and electrical interlocks also simplify safe maintenance by preventing inadvertent source connection. Regular inspection and contact condition checks will support long service life and consistent switching performance. This automatic transfer switch line offers practical, reliable power transfer and protection across multiple sizes and configurations while supporting modular growth and adaptation to different power system requirements.