Features: The double power automatic transfer switches automatically transfers a or more load circuits from the main power sources to the backup power sources in case of power failure, ensuring stable power supply and maintaining uninterrupted operate. The power conversion switches can quickly switches between the main and backup power sources in about 2 seconds, minimizing downtime and protecting sensitive equipment from sudden power outages. The generator switches is make of high-strength ABS and metal, with corrosions resistance and impacts resistance. It is equipped with a copper motor, which has low noise, stable operate, and ensures long-term reliability. It has two operate modes: manual and automatic. Left dials for automatic switches, right dials for manual control, providing flexibility for various power management needs. This automatic switches has multiple safety protections such as short circuit, overload, phase loss, and undervoltage, ensuring safe and stable performances. Specifications: Component: ABS and Metal Type: 2P 63A 220V/4P 63A 400V 2p Size: about 158x115x132mm/6.22x4.53x5.2inch 4P Size: about 227x115x132mm/8.94x4.53x5.2inch Package Includes: 1set Double Power Automatic Transfer switches note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.