Product: NXZB63S/4A40AC40 Model: NXZB63S/4A 40A C40 Overview A compact automatic transfer device designed to detect supply loss and switch power sources automatically to maintain continuous supply. Mechanical and electrical interlocking prevents simultaneous closure of both sources, while a stable contact design ensures smooth switching and long service life. The unit supports functional module expansion for customized control and monitoring. Key benefits Continuous power availability: automatic detection and fast transfer between power sources reduces downtime for critical circuits. Safe and reliable operation: mechanical and electrical interlocking prevents short circuits between sources and provides layered protection during switching. Durable performance: stable internal design and smooth contact action extend operational life and reduce maintenance intervals. Flexible functionality: modular architecture accepts a variety of functional modules for monitoring, control, and to meet evolving system requirements. Clear specification: supplied in the NXZB63S/4A40AC40 size designation, model NXZB63S/4A 40A C40 with a 40A rating. Main functions and attributes Function: automatic detection of primary and secondary supplies and automatic transfer to maintain continuity. Safety features: electrical and mechanical interlock to avoid source shorting; multiple builtin protection functions for reliable switching. Modularity: supports additional modules for expanded control, signaling, and to improve transfer performance. Performance: designed for stable, smooth contact switching and long operational life under normal electrical load conditions. Compatibility and size: identified as NXZB63S/4A40AC40, model NXZB63S/4A 40A C40, suitable for electrical systems requiring switching at a 40A rating. Construction: robust electrical construction intended for standard installation environments and reliable long term use. Typical applications Backup generator switching for small commercial buildings and service panels where uninterrupted power is required for lighting, security systems, or essential equipment. Transfer of critical circuits in server rooms or IT closets to maintain uptime for networking and data equipment. Industrial control panels and production lines where automatic source switching minimizes production interruption and protects sensitive motors or controllers. What this product solves Eliminates manual intervention for source transfer and reduces response time when a supply failure occurs. Prevents dangerous simultaneous connection of two power sources through mechanical and electrical interlocking. Provides a scalable platform that can be adapted with additional modules to meet monitoring and control requirements as systems change. Ordering information Size designation: NXZB63S/4A40AC40 Model code: NXZB63S/4A 40A C40 For installations, verify system requirements and compatibility with the device designation NXZB63S/4A40AC40 and the 40A rating prior to selection.