1SAFE AND FLAME RETARDANT: This automatic transfer switch is made of excellent flame retardant PC materials, possess good insulation, high temperature resistant, aging resistant, safe and reliable, use silver contacts can greatly improve the conductivity and service life of the product 22 OPERATION MODES: Power transfer switch support automatic operation or manual operation, has compact structure, reliable transmission, convenient installation and maintenance, long service life 335MM STANDARD RAIL MOUNTING: Dual power automatic switch is a miniature household power switch, which is mainly used to test whether the main power supply or backup power supply is normal to ensure the continuity, reliability and safety of the power supply, designed for rail mounting, specially for PZ30 distribution box 4MILLISECONDS SWITCHING: Automatic transfer switch is very useful, when the normal power supply is abnormal, the backup power supply works immediately, and the power supply is switched in milliseconds without interruption 5APPLICABLE SCENARIO: Power transfer switch switch to the backup power supply when there is a power failure, and switch to the main power supply when power recovery, suitable for 50 or 60Hz AC rated 230V emergency power supply system, widely used in various places where continuous power failure is not allowed, like factories, shopping malls, nurseries, etc. 1 x Dual Power Automatic TransferSwitch 1 x User Manual