Neumarkt, Germany: The DSM surge arrester from Dehn is designed to protect telecommunications equipment from the effects of electrical surges due to lightning or electrical switching. The compact protector is ideally suited for installation into flush-mounted boxes or small enclosures, while the use of removable plug-in terminals makes installation very straightforward and simple. In a typical installation, the DSM is fitted at the socket outlet of the telecommunications equipment being protected. This will provide a high level of protection to any connected equipment for minimal cost. The family of DSM arresters includes models for two or four standard lines and ISDN versions. Dehn & Söhne, Neumarkt, Germany.