Switchgear cabinet structure using assembled, circuit breaker handcart floor structure; equipped with a new type of composite insulated vacuum circuit breaker, and a good interchangeability; handcart frame is equipped with screw nut propulsion mechanism, can Easily move handcart, and to prevent misuse and damage to the propulsion mechanism; the main switch, handcart, door interlock switch between mandatory mechanical locking methods are used to meet the "Five Anti" function; all the operations available on the door Under the closed state; cable ample room space, can be connected to multiple cables; fast earthing switch and circuit shorted to ground; shell protection grade IP3X, handcart compartment door open state, protection IP2X