The utility model relates to a breaker maintain appurtenance, especially a rotor rotational lock. Include the locating pin and install the fixing base in the breaker frame, limiting clamping plate is installed to the symmetry on the fixing base, and the fixing base is provided with the location pinhole, and the gag lever post is installed to locating pin one end. The beneficial effects of the utility model are that: simple structure, ann tears the convenience open, fix a position reliable and stablely, and the rotor does not have and rocks, can effectively improve the security that the operator worked.