Combined surge arresters for protection of analog telephone lines, digital telephone lines (ISDN), and Ethernet 10(0)Mbps computer networks. Inputs and outputs equipped with RJ type connectors enable simple and easy installation of the arrester. The grounding conductor should be connected to the elements connected to the PE conductor. Most often, such an element is the metal housing of the device, or a grounded patch cabinet. One arrester is used to protect one line. The limiter housing is made of aluminum profile.