Size and Model: NH4225/4SZ Overview The NH4225/4SZ is an automatic power transfer device designed to maintain continuous power supply and protect electrical systems during source transitions. It combines automatic detection, mechanical and electrical interlocking, and modular expandability to deliver reliable switching and long operational life. Key benefits Continuous power availability: automatic detection and transfer between power sources ensures minimal interruption to load equipment and reduces downtime. Enhanced safety and fault prevention: mechanical and electrical interlocking prevents simultaneous source closure and avoids short circuit conditions. Multiple protection functions reduce risk to connected equipment. Durable operation: stable internal design and smooth contact switching minimize wear and extend service life, lowering maintenance frequency. Flexible : supports a variety of functional modules for expansion and tailored configurations to meet specific application needs and improve conversion outcomes. Core functions and attributes Automatic detection and switching of power supply to maintain continuity. Mechanical and electrical interlocking to prevent unsafe switching combinations. Multiple protection functions for reliable operation under fault conditions. Smooth contact switching for reduced electrical stress and longer lifecycle. Functional modularity to add or change capabilities without major rework. Size and model designation: NH4225/4SZ for clear compatibility and specification matching. Compatibility and performance Designed for integration into systems requiring reliable automatic transfer and protection. Modular approach simplifies adaptation to different control schemes and monitoring requirements. Stable switching performance supports consistent operation under repeated transfers. Typical applications Commercial buildings and emergency power systems where automated transfer to backup sources preserves critical services. Industrial control panels and manufacturing lines that require safe, reliable switching between primary and secondary power to avoid production stoppages. Data centers, telecom sites, and infrastructure equipment where uninterrupted power and secure switching protect sensitive electronics. Summary The NH4225/4SZ delivers automated, safe, and durable power transfer with modular flexibility for . It is suited to applications that demand continuous power availability, secure switching logic, and longterm reliable operation.