Model NH40125/4SZ automatic transfer switch Key benefits Ensures uninterrupted power: automatic detection and fast switching between power sources to maintain continuous supply during source loss or change. Prevents short circuits and misuse: combined mechanical and electrical interlocking prevents concurrent source connection and reduces risk of electrical faults. Durable, reliable operation: stable structural design and smooth contact switching extend service life and reduce maintenance needs. Flexible and scalable: modular design accepts a range of functional modules for and future expansion to match changing system requirements. Main functions and attributes Function: Automatic detection and transfer of power supply to maintain continuity between primary and secondary sources. Protection: Mechanical interlock plus electrical interlock with multiple protection functions to avoid improper switching and short circuits. Modularity: Supports a variety of plugin functional modules for remote control, signaling, metering, and logic expansion without major rewiring. Size and model: NH40125/4SZ, designed for panel or switchgear mounting where this model form factor is required. Compatibility: Suitable for installations compatible with the NH40SZ family of transfer equipment. Performance: Designed for smooth contact engagement and reliable switching cycles to minimize arcing and wear. Practical applications Commercial buildings and office towers: Automatic transfer between utility and backup generators to prevent downtime for lighting, HVAC, and critical systems. Industrial facilities and production lines: Maintain continuous power for control systems and machinery while protecting equipment from incorrect source coupling. Data centers and telecommunications sites: Integrated transfer and modular signaling to support rapid switchover and remote monitoring of power status. Why choose this model This transfer switch model delivers dependable automatic source switching, robust interlock protection, and a modular platform for easy . It is intended for installations that require uninterrupted power continuity, reduced risk of switching faults, and the ability to expand functionality as system needs evolve.