Model: NXZB63S/4A 63A C63 Size designation: NXZB63S/4A63AC63 Key benefits Ensures continuous power: automatic detection and automatic switching between power sources reduces downtime and maintains supply continuity. Prevents electrical conflicts: mechanical and electrical interlocking reduces the risk of power short circuits and supports multiple protection functions. Long service life: stable structural design and smooth contact switching extend operational life and reduce maintenance needs. Flexible and expandable: modular design accepts a variety of functional modules for easy and future expansion to match changing requirements. Main functions and attributes Function: automatic transfer switch for seamless changeover between primary and secondary power sources. Rated performance: 63A rated current with C type characteristic (C63). Protection features: mechanical interlock and electrical interlock to prevent simultaneous connection of two sources and to protect against improper switching conditions. Modularity: supports plug in functional modules for monitoring, remote control, or auxiliary functions, enabling tailored configurations without major rewiring. Construction and operation: robust contact mechanism designed for smooth switching action and reliable long term operation. Compatibility: suitable for integration with mains supply, backup generators, UPS systems, and distribution panels rated up to 63A. Practical applications Small commercial and office buildings: automatic switchover between utility power and backup generator to keep critical systems running during outages. Telecom and network cabinets: maintain continuous power to routers, switches, and servers while enabling remote monitoring and control through modular options. Industrial control panels and light manufacturing lines: provide quick, reliable transfer between power sources to minimize production interruptions and protect control equipment. Additional notes Model and size designations must be used when specifying replacements or ordering compatible modules: NXZB63S/4A 63A C63 and NXZB63S/4A63AC63. Modular expansion allows simple upgrades for added monitoring, remote operation, or auxiliary signaling without changing the main switch unit.