Lock catch device and converter

A locking device, a converter, and an electrical switch for fixing the converter, the locking device comprising: a guide rail extending along an X direction, the guide rail being used for mounting the electrical switch and fixing the electrical switch in a Y direction; the support extends in the Z direction, the support is provided with a first end and a second end which are opposite in the Z direction, the first end is installed on the guide rail, and the support is provided with a first side face and a second side face which are opposite in the X direction; the fixing piece is connected to the second end, is movably connected with the bracket and can extend out of the first side surface or the second side surface; wherein the X direction, the Y direction and the Z direction are perpendicular to one another, and the electrical switch is located on one side of the first side face and/or the second side face. And the fixing piece is used for limiting the displacement of the electrical switch in the Z direction