Model and Size: NH40400/4SZ Overview This automatic power switching device provides reliable detection and seamless transfer between power sources to maintain continuous supply. Designed for stable operation and long service life, model NH40400/4SZ combines automated control, layered protection, and modular expandability. Key benefits Ensures continuous power: automatic detection and switching of power supply minimizes downtime and maintains service continuity for critical loads. Enhances safety: mechanical and electrical interlocking prevents simultaneous connection of two sources and reduces the risk of short circuiting. Low maintenance and long life: stable internal design and smooth contact switching reduce wear and extend operational lifetime. Flexible and future ready: supports multiple functional modules to expand capability and behavior, improving transfer performance for diverse applications. Reliable protection: multiple protection functions provide robust response to abnormal conditions without manual intervention. Main functions and attributes Automatic detection and switching of power supply to maintain continuity. Mechanical and electrical interlocking for safe source selection and to prevent accidental crossconnection. Smooth contact switching to reduce arcing and mechanical stress. Modular architecture that accepts a variety of functional modules for communication, control logic, or specialized protections. Model and size specification maintained as NH40400/4SZ for compatibility with system designs that specify this unit. Compatibility and performance notes Compatible with systems that require an automated transfer solution sized to NH40400/4SZ. Stable design supports frequent switching operations while preserving contact integrity and overall reliability. Modular options allow integration with existing control schemes and expansion as operational needs change. Typical applications Backup power systems in commercial buildings for automated transfer between utility and generator supply. Industrial power distribution where uninterrupted supply is required for production lines and critical equipment. Data centers and telecommunications facilities that require automatic, reliable switching to protect sensitive loads. Installation and Modular format makes it straightforward to add control or monitoring modules to meet site specific requirements. Designed for integration into switchgear and power distribution setups that specify model NH40400/4SZ. This device is intended for use where automated power continuity, safety interlocks, and modular expandability are required.