Supply PowerMaster Model “SL” Slide Door Operator(s) for use on Sliding Doors. Primary reduction shall be by heavy duty V-Belt Drive. Secondary reduction shall be a chain and sprocket arrangement. Motor shall be continuous duty industrial type protected from overload by a current sensing or thermal type overload device. Motor shall be of the high starting torque, continuous duty industrial type, protected from overload by a current sensing or thermal type overload device. Motor controller shall be a heavy duty, full voltage, across the line, magnetic reversing contactor, that is mechanically and electrically interlocked.