Features [Millisecond Switching] This dual power automatic transfer switch exchanges to the standby power source immediately when the primary power source fails, offering uninterruptable power supply within milliseconds. [PC Grade Electromagnetic Drive] Mainly used to test the stability of the primary or standby power source, this feature ensures the continuity, reliability, and safety of power supply. [Versatile Operation Modes] The power transfer switch allows for both automatic and manual operation, ensuring continued power supply. Its compact and reliable structure facilitates easy installation and maintenance. [Premium Materials] The generator changeover switch is made of PC flame resistant plastic, offering excellent insulation, high temperature resistance, and anti aging properties. Silver contact points enhance conductivity and extend lifespan. [Wide Application Range] Suitable for emergency power supply systems rated at 400V AC 50Hz, this dual power ATS is ideal for first grade national load and can be used in various settings where continuous power supply is essential, such as factories, malls, nurseries, etc. Spec: Item Type: Dual Power Automatic Transfer Switch Material: PC Flame Retardant, Silver, Rubber Model: NLQ6 400 3P Rated Current: 400A Rated Voltage: AC400V Rated Short Circuit Connection Capacity: 17KA Rated Short Circuit Current: 10kA Rated Impulse Withstand Voltage: 8kV Rated Frequency: 50Hz Grade: PC Grade Usage Category: AC 33B Standard: GB T14048.11 IEC60947-6-1 How to Use: Use according to the electronic manual. packing list: 1 x Dual Power Automatic Transfer Switch 2 x Rubber Pad 1 x Manual Handle 4 x Package List 1 x Dual Power Automatic Transfer Switch 2 x Rubber Pad 1 x Manual Handle 4 x Fuse