Model NH4240/4SZ | Size NH4240/4SZ Overview A compact automatic power transfer device designed for uninterrupted power supply, reliable protection, and easy functional expansion. Combines automatic detection and switching with mechanical and electrical interlocking to reduce downtime and protect connected systems. Key benefits Continuous power availability: automatic detection and switching between power sources maintains power continuity for critical loads. Reduced risk of electrical faults: mechanical and electrical interlocking prevents simultaneous closure of sources and minimizes short circuit risk. Durable, long service life: stable design and smooth contact switching reduce wear and extend operational life. Flexible and scalable: supports multiple functional modules for and straightforward expansion to meet changing requirements. Simplified integration: compatible with common power distribution setups and modular control schemes for straightforward installation. Main features Automatic transfer function: monitors incoming power sources and switches automatically when a predefined condition is met, minimizing manual intervention. Interlocking protection: combined mechanical and electrical interlock provides layered protection during switching operations. Multiple protection functions: includes built in protections to prevent improper operation and protect connected equipment during transfer. Smooth contact operation: engineered contact mechanisms ensure steady switching action to reduce arcing and wear. Modular design: accepts a variety of functional modules to add monitoring, control, or communication capabilities as needed. Compact size: model and size NH4240/4SZ fit into typical electrical panels and distribution cabinets where space is limited. Compatibility and performance Function: automatic transfer and switching to ensure continuity of supply for essential loads. Compatibility: designed to work with standard power distribution equipment and modular control interfaces. Suitable for integration into industrial, commercial, and infrastructure installations. Performance: stable switching behavior with reliable detection and transfer logic to support continuous operation of dependent systems. Typical applications Commercial buildings: maintain uninterrupted power to lighting, emergency systems, and elevators by automatically switching to backup feeders or generators. Data centers and server rooms: protect critical IT loads by ensuring fast, reliable source transfer and reducing risk of downtime. Industrial facilities: integrate with plant power distribution to protect production lines and control systems during utility interruptions or generator start sequences. Installation and maintenance notes Intended for panel mounting in accordance with standard electrical installation practices. Modular configuration allows for tailored feature sets without replacing the basic unit. Regular inspection of contact condition and functional modules extends service life and maintains reliable operation. Model and sizing information Model: NH4240/4SZ Size: NH4240/4SZ This product is suited for systems that require reliable, automatic transfer of power with modular expandability and proven switching durability.