Features Small size, simple structure, beautiful appearance, easy to operate, long service life.Switch conversion drive adopts single motor drive, simple structure, reliable and stable conversion, no noise, small impact. AC- controller protection fuse breaking capacity of 50KA, improved distribution security.Interlock is added between manual operation mode and automatic operation mode to ensure that manual operation cannot be performed under automatic condition. Switch with electromechanical interlock protection, to ensure that the automatic switch reliable operation, non-interference.The switch can automatically change the load, and the handle can be used to switch manually in case of emergency. Automatic switch does not switch when breaking handle, bonding contact or load failure (overload, short circuit), truly realize electromechanical interlock. The escapement mechanism of MCB automatic change-over switch is changed from fork type to concave type, which can solve the problems such as the fracture of MCB lengthened handle and the asynchronous closure of MCB, restore the function of quick closing and quick breaking of MCB, and effectively improve the mechanical life of the product. Overview: NLQ1 intelligent double power automatic switch (hereinafter referred to as the switching device), suitable for AC 50/60hz, rated working voltage 400V, rated current from 16~1250A double power supply system. In case of failure of common power supply, switching device can realize automatic switching with standby power supply or generator to ensure the reliability and safety of power supply. Also can carry on the selective switch between two power sources according to the load need. Products with overload, undervoltage, short circuit, off - phase protection functions.  Specification: Material: Plastic Weight: 1671g/58.9oz Model: NDQ1-63/4 Insulation voltage: 400 (V) Rated working voltage: AC 50Hz 400 (V) Rated current: 63 (A) Pole number: 4 Rated short time withstand current: 63A 3 optional working modes: Self-throw and self-reply working mode. Alternate working mode. Self - feeding and self - restoring working mode. 3 stable working positions: Common power supply and standby power supply. Common power supply, backup power supply. Common power supply points, standby power points. Use level: AC-33B, motor load or mixed load including motor, resistance load and white light load up to 30%. Package List: 1 x Automatic Transfer Switch Note:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Package List