1Good PC and Silver: Flame retardant PC plastic material is used, which has good insulation, high temperature resistance, aging resistance, safety and reliability. The use of silver contact with terminal protection cover can greatly improve the conductivity and service life of the product. 2Two Operating Modes: Automatic or manual operation, millisecond switching without power outage, compact structure, reliable transmission, and convenient installation and maintenance. Widely used in various situations where continuous power outages are not allowed. 335mm Standard Rail Installation: The dual power automatic switch is a miniature household power switch mainly used to test whether the main or backup power supply is normal, to ensure the continuity, reliability, and safety of the power supply. This product is designed specifically for installation and is specifically designed for PZ30 distribution boxes. 4Millisecond Level Switching: When a normal power supply encounters an abnormality, the backup power supply immediately operates. Millisecond level switching achieves the effect of continuous power supply, ensuring the continuity, reliability, and safety of power supply. 5Wide Application: Switch to backup power supply during power outage, switch to main power supply during incoming call, suitable for emergency power supply systems with rated 220V AC at 50 or 60Hz, widely used in various places where continuous power outage is not allowed such as factories, shopping malls, seedling farms and other places. 1 x DualPowerAutomatic TransferSwitch 2 x Protective Cover 1 x Accessory 1 x User Manual