Abstract: An electrical coupler comprising a housing with an end opening, an insulation block arranged in the end opening, a lid having an open position and a closed position, an arm attached to the lid and to the housing, whereby attachment of the arm to the housing allows a rotation of the arm relative to the housing around a rotational axis, and optionally a series of arms connected to each other to allow one arm to rotate relative to a neighbouring arm. The lid further comprises a housing contact surface that contacts or is in close proximity to a lid contact surface of the housing, a reference line through the point of the lid contact surface furthest away from the base plane, and wherein a part of the housing contact surface crosses a reference plane closer to the base plane than the reference line is, as the lid is moved from the closed to the open position.