This threephase automatic transfer switch continuously monitors all three lines and automatically shifts the load to a stable supply when irregular voltage or overcurrent conditions are detected. It protects connected equipment from damage caused by undervoltage, overvoltage, and overload, and returns to the primary phase once the supply is within normal limits. Key benefits Continuous threephase protection: Monitors L1, L2, and L3 for voltage and current abnormalities to reduce the risk of equipment malfunction. Fast automatic transfer: Transfers load to an available phase in under 0.2 seconds when a fault is detected, then restores the primary phase when conditions normalize. Configurable protection: Factory defaults suit common installations, while voltage and current limits, overvoltage and undervoltage thresholds, and delay times can be adjusted for precise protection. Clear operational feedback: Fourdigit LED display provides realtime voltage and current readings for immediate status checks and easier diagnostics. Easy integration: DIN rail mounting and standard power terminals simplify installation into distribution panels and control cabinets. Features and specifications Item type: Automatic transfer switch for threephase systems Power supply terminals: N, L1, L2, L3 Threephase monitoring: Simultaneous measurement of voltage and current on L1, L2, L3 Rated frequency: 50/60 Hz Working voltage range: 80350 VAC Rated current: 63 A Default cutoff settings: 170 V lowvoltage cutoff, 270 V voltage cutoff Overvoltage setting range: 110300 V Adjustable delay settings: 1 to 600 seconds Automatic switching behavior: Detects irregular voltage or excessive current and switches to a functioning phase; automatically reverts when the primary phase stabilizes Display: Fourdigit LED readout for live voltage and current values Material: Fireretardant PC material for durable electrical enclosure Mounting: DIN rail compatible for quick panel installation Package contents: 1 x Automatic transfer switch, 1 x User manual Applications and use scenarios Industrial control panels and motor control centers where threephase continuity and protection are essential for manufacturing equipment. Small server rooms and IT closets to reduce the risk of outages caused by phase loss or voltage irregularities and to provide live monitoring data for system administrators. Agricultural irrigation systems, HVAC units, or workshop machinery that require reliable phase protection and fast automatic recovery after transient faults. What it solves Prevents equipment damage from undervoltage, overvoltage, and sustained overcurrent conditions. Minimizes downtime by automatically switching to a healthy phase within a fraction of a second and returning to the main supply when stable. Reduces the need for manual intervention with adjustable protection thresholds and a clear realtime display for quick troubleshooting. Installation and compatibility notes Designed for threephase electrical systems with terminals N, L1, L2, L3 and compatible with 50/60 Hz supplies. Mounts on standard DIN rails for integration into existing distribution panels and control cabinets. Default settings suit common installations but should be reviewed and adjusted to match the requirements of connected equipment. This automatic transfer switch provides reliable threephase monitoring, fast automatic changeover, and configurable protection limits to safeguard sensitive equipment and maintain continuity of power in diverse settings.