1MAIN USE: Dual power automatic transfer switch is to test whether the main power supply or backup power supply is normal to ensure the continuity, reliability, and safety of the power supply. 2STURDY CONSTRUCTION: PC shell is flame retardant, fire resistant, high temperature resistant, stable and reliable. Silver contacts ensures premium conductivity and long service life. 32 OPERATION MODES: Operated automatically or manually, millisecond switching constant power, compact structure, reliable transmission, easy installation and maintenance. 4MILLISECOND LEVEL SWITCHING: When the normal power supply encounters an abnormality, the backup power supply immediately starts working, the power transfer switch achieves millisecond switching to ensure continuous, reliable, and safe power supply. 5WIDE APPLICATION: This dual power automatic transfer switch is suitable for emergency power supply systems with rated AC 50 or 60Hz, widely used in various places that do not allow continuous power outages, such as factories, shopping malls, nurseries, etc. 1 x Dual Power Automatic Transfer Switch 1 x Manual