【Dual Switching Mode】 The power transfer switch is at the PC level. Automatic mode is used during power outages, while manual mode is used for direct control. The switching time between the main power supply and the backup power supply is 0.05 seconds, reducing the risk of device restarts and meeting all your power needs. 【Easy to Install and Use】 The automatic dual power transfer switch uses a 35mm DIN rail. It can be installed vertically or horizontally in PZ30 cabinets and other distribution panels. Its extremely compact design effectively reduces construction costs. 【Comprehensive Safety】 The backup power switch is made of ABS and uses silver alloy contacts, providing fire and dust protection, strong electrical conductivity for the contact, and good insulation. It meets the IP30 enclosure protection rating, CE/UL, and other standards. Multiple safety certifications; it also has an overvoltage protection function, 220V / 50Hz Undervoltage value: 175V Recovery value: 195V Overvoltage value: 260V Recovery value: 240V (± 5V), the overvoltage value can be customized. 【Worry-free Scene Application】 2P is a single-phase circuit with an operating voltage of 220V (85% -110%); 4P is a three-phase circuit with an operating voltage of 380V (85% -110%). 2P is mainly used for power supply of small loads such as homes, offices, and others, while 4P is suitable for power supply of industries, commerce, and large buildings. 4P provides more stable performance and higher efficiency than 2P and is ideal for powering large motors and other heavy equipment.