A switchgear having a turn and twist mechanism for electrical connection and disconnection, the switchgear comprising a contact system for electrical current conduction and bus transfer switching, the contact system comprising: at least one fixed contact assembly, comprising a fixed main contact (202a, 202b) and a fixed arcing contact, wherein the fixed arcing contact is provided for bus transfer switching, and wherein the fixed arcing contact is a finger comprising a contacting element for engaging with a corresponding contacting element of a movable arcing contact of the contact system during bus transfer switching; and at least one movable contact assembly comprising a current path pipe and an end piece, wherein the current path pipe is a cylindrical pipe and the end piece is a rectangular block attached at an end of the cylindrical pipe, wherein the movable contact assembly comprises a movable main contact and the movable arcing contact, wherein the movable main contact is for engaging with the fixed main contact for current conduction, and the movable arcing contact is for bus transfer switching, wherein the movable main contact is provided on the rectangular block, and the movable arcing contact is provided at the end of the cylindrical pipe on a portion about the periphery of the cylindrical pipe, wherein during engagement of the movable contact assembly with the fixed contact assembly, the cylindrical pipe turns about a first axis (AA') to bring the movable contact assembly proximal to the fixed contact assembly, and then twists about a second axis (BB') for engagement of the movable main contact with the fixed main contact, wherein during the engagement of the movable and fixed contact assembly the arcing contacts for bus transfer switching are contacts (204, 310) that are first to engage and are disengaged when the movable main contact and the fixed main contact (202a, 202b) are engaged. at least one fixed contact assembly, comprising a fixed main contact (202a, 202b) and a fixed arcing contact, wherein the fixed arcing contact is provided for bus transfer switching, and wherein the fixed arcing contact is a finger comprising a contacting element for engaging with a corresponding contacting element of a movable arcing contact of the contact system during bus transfer switching; and at least one movable contact assembly comprising a current path pipe and an end piece, wherein the current path pipe is a cylindrical pipe and the end piece is a rectangular block attached at an end of the cylindrical pipe, wherein the movable contact assembly comprises a movable main contact and the movable arcing contact, wherein the movable main contact is for engaging with the fixed main contact for current conduction, and the movable arcing contact is for bus transfer switching, wherein the movable main contact is provided on the rectangular block, and the movable arcing contact is provided at the end of the cylindrical pipe on a portion about the periphery of the cylindrical pipe, wherein during engagement of the movable contact assembly with the fixed contact assembly, the cylindrical pipe turns about a first axis (AA') to bring the movable contact assembly proximal to the fixed contact assembly, and then twists about a second axis (BB') for engagement of the movable main contact with the fixed main contact, wherein during the engagement of the movable and fixed contact assembly the arcing contacts for bus transfer switching are contacts (204, 310) that are first to engage and are disengaged when the movable main contact and the fixed main contact (202a, 202b) are engaged.