Patent ID: 7435920

Claim:
In an automatic transfer switch which includes ratchet gears rotating by means of an operation of a handle, connection rods which operate in sync with the ratchet gears with one side of each of the gears being connected with shafts having a plurality of connection units, springs which are installed at the connection rods, a switching means which is connected with one of the connection units and the other connection unit wherein when the switching means is connected with one of the connection units, the other connection unit is disconnected, and a trip means which is connected with the one of the connection units and the other connection unit and allows a neutral state by disconnecting the connection units, the automatic transfer switch with a double throw air circuit breaker, comprising: a motor which is engaged at a lower end of a body with an eccentric roller being formed at a front end of a rotary shaft; an automatic rotation means which operates by receiving power via an arm having latches at both sides of the arm and rotates the ratchet gears, with a longitudinal hole, which accommodates an eccentric roller forming one of the latches therein, being formed at one side of the arm, with the other side of the arm being engaged with the ratchet gears; and insulators which are engaged on the shafts, with the connection units being engaged at front sides of the insulators.