Automatic transfer switch with overcurrent, overvoltage and undervoltage protection designed for use with generators, inverters and power grids in homes, data centers, hospitals and industrial sites. Built for continuous reliable operation and straightforward monitoring. Key benefits Protects connected equipment from voltage spikes, drops and overloads by automatically switching phases when a fault is detected. Preserves uptime by prioritizing a preferred phase and restoring normal power quickly. Long service life with mechanical life of 1 x 10^6 operations and electrical life of 1 x 10^5 operations. Clear, real time monitoring via a 4 digit LED display that reports voltage and current. Main features Automatic power switching protection: detects overvoltage, undervoltage or overcurrent on the active phase and transfers load to a healthy phase automatically while honoring the preferred phase setting. Default protection thresholds: under voltage tripping at 170 V or below; over voltage tripping at 270 V or above. Adjustable thresholds: factory settings suit most installations, and overvoltage, undervoltage and overcurrent trip points can be fine tuned to meet specific requirements for compatibility with generators, inverters and grid supplies. Real time display: 4 digit LED shows voltage and current for easy verification of power status; measurement error of just 1 ensures accurate readings for monitoring and troubleshooting. Durable construction and reliable switching performance designed for demanding environments. Practical applications Residential backup power: automatically switch between grid and generator or inverter to protect household appliances during voltage disturbances. IT and data center power management: maintain stable supply to servers and network equipment by switching to a safe phase when anomalies occur. Industrial and facility equipment protection: safeguard motors, control panels and critical systems in factories, hospitals and commercial buildings from damaging voltage events. Compatibility and installation notes Intended for integration with standard power grids, generator sets and inverter systems. Default settings provide immediate protection but can be adapted to sitespecific voltage and current limits. Designed for professionals and installers familiar with three phase switching systems. This device delivers automated phase switching, configurable protection thresholds and real time monitoring to reduce downtime and protect sensitive equipment from unexpected power fluctuations.