Automatic transfer switch with n-phase overlapping structure

An automatic transfer switch with an N-phase overlapping structure, the switch comprising:

• a driving unit including a drive shaft provided to generate power;
• a three-contact switching unit including a normal power shaft and an emergency power shaft provided to be rotated by the drive shaft, and a normal power terminal and an emergency power terminal for inputting/releasing normal power and emergency power by rotation of the normal power shaft and the emergency power shaft;
• and
• an N-phase overlapping unit including a first insertion part having a first insertion hole into which the normal power shaft is inserted, an N-phase normal contact terminal provided to input/release an N-phase normal power by rotation of the first insertion part, a second insertion part having a second insertion hole into which the emergency power shaft is inserted, an N-phase emergency contact terminal provided to input/release an N-phase emergency power by rotation of the second insertion part, and a connection bar connected between the first insertion part and the second insertion part so as to be interlocked with each other by rotation of the first insertion part and the second insertion part,
• wherein the first insertion part of the N-phase overlapping unit is provided to be interlocked with the rotation of the normal power shaft, and the second insertion part is provided so as to be rotated independently of the emergency power shaft.