Compact din rail mounted automatic transfer switch for reliable power continuity in 400V installations. Rated 63A and available in 2P or 4P configurations. Model code and color reference Q4PC 4P 400V. Key benefits Ensures continuous power by automatically switching between two sources, reducing downtime and manual intervention. Clear compatibility with standard 400V electrical systems and common backup solutions such as generators, inverters, and UPS units. Space saving din rail design for easy integration into distribution panels and control cabinets. Rated performance for steady operation at 63A, suitable for a wide range of residential, commercial, and light industrial circuits. What it does Automatic transfer switch function monitors the primary supply and switches to the secondary supply when needed, then returns when primary is restored. Electrical selector switch capability supports manual selection when required, providing operational flexibility. Available in 2P for single phase or split neutral applications and 4P for three phase plus neutral arrangements. Key attributes Rated current: 63A. Voltage reference: 400V. Pole options: 2P and 4P. Mounting: Din rail for straightforward installation in standard panels. Function: Dual power automatic transfer switch and electrical selector switch for uninterrupted power transfer. Performance and reliability Designed for repeated switching cycles in typical power backup scenarios. Compact footprint minimizes cabinet space while providing full transfer functionality. Simple wiring layout for standard mains and backup connections makes installation and maintenance efficient. Typical applications Residential backup: Automatic switching between grid and generator to keep essential circuits powered during outages. Small commercial locations: Protection for retail outlets, small offices, and restaurants where rapid source changeover prevents operational interruptions. Industrial control panels and equipment: Integration in machinery control cabinets to maintain power to critical control circuits and instrumentation. What to check before installation Confirm system voltage and wiring configuration match the selected pole version 2P or 4P. Verify the continuous load does not exceed the 63A rating. Ensure compatible space on the din rail for secure mounting and clear access for wiring. This transfer switch provides a compact, rated solution for automatic and manual source selection in 400V systems, supporting uninterrupted power needs across residential, commercial, and light industrial environments.