Features Two Unit Miniature Circuit Breaker: The automatic transfer switch is composed of two unit miniature circuit breaker and accessories (auxiliary contact, alarm contact), mechanical interlocking transmission, controller and other components. Mechanical and Electrical Interlocking: This automatic transfer switch has mechanical interlocking and electrical interlocking functions, can be switched by reliability, can be powered manually or automatically. Stable Performance: This switch has small size, simple structure, easy operation, long service life, superb craftsmanship, isolation anti interference and stable performance. No Noise: The transfer switch is driven by a single motor, noiseless and low impact, equipped with user terminals to reflect the breaker status (open or closed), with various indications on the panel. Wide Application: Our automatic transfer switch is suitable for lighting and small motor control equipment. It is widely used in homes, shopping malls, factories, laboratories, farms and other situations. Specification: Item Type: Double Power Automatic Transfer Switch Material: PC Rated Voltage: 400V Frequency: 50 or 60Hz Number of Poles: 4 Segmentation Capacity: 35KA ATSE: CB grade Rated Current: 63A Working Principle:  This series of dual power supply controller and drive mechanism power supply signal depends on the A phase and N line of the common switch or standby switch inlet port. Dual power supply in automatic state, when the incoming phase A and N common switch voltage is normal (AC190 to 240v), the common switch will be closed in priority regardless of whether the common power B.C and standby switch a.b.c, N voltage is normal. At the same time, the power supply indicator and the common off indicator light up. When the incoming public switch A phase and line N have no voltage, and the incoming standby switch A phase and line N have normal voltage, the dual power supply turns to standby closure regardless of whether the normal switch B and standby switch C have normal voltage. The power indicator and standby closure indicator are on.  Package List: 1 x Dual Power Automatic Transfer Switch 1 x User Manual Package List 1 x Dual Power Automatic Transfer Switch 1 x User Manual