Automatic switching type generator set, with the machine, short distance, remote three level monitoring. Monitoring of three-phase power voltage, city frequency, three-phase oil machine voltage, three-phase oil machine current, oil machine voltage / frequency. Power status or load status, ATS switch status, various faults, events, display. Automatic switch in the screen of an integral switch, all controls are completed by CPU. With manual / automatic switching function: when the key switch to the "M" position, ATS C P U automatic switching control of DC24V motor; when the key switch to the "hand" position, cut off the ATS motor power, ATS conversion by hand. Lock function: in order to prevent misuse, to ensure the safety and reliability of ATS power supply, with the chain lock device, ensure ATS always in a position of power supply. Automatic / manual all lock. Mechanical and electrical interlocking: double mechanical interlocking: "I" and "II" file "quadrupole main contact" of "harmony" by a DC24V electric motor drives a reversing mechanical lever to complete, to ensure that the ATS always composed of a power supply to the load power supply. Electrical interlocking: the relay that controls the closing of the DC24V motor is electrically interlocked with each other to ensure the reliable positive and negative rotation of the motor. Breaking capacity: the arc suppression device adopts a multi valve arc suppression groove to suppress and extinguish the arc, and has a strong breaking capacity. Neutral setting: when switching, there is a neutral switching time of 2 seconds, it can achieve reliable switching between city power and oil machines.