Abstract: A protector module includes two input prongs receiving electrical signals from an outside plant, two output prongs outputting electrical signals to exchange equipment, a ground prong for grounding an abnormal signal induced by lightning strikes, an indicating device, a printed circuit board defining a plurality of pad portions and through holes, and two blocks each receiving a plurality of arresters, thermistors, and tin bits and respectively mounted on a first surface and a second surface of the printed circuit board.