DGM Type 1 Overvoltage Arrester

Family : Surge arrester
Category : Low voltage network

DGM type compact overvoltage arresters protect electrical systems against overvoltage which may occur in the power supply circuit during a storm (lightning) or during coupling to the network (industrial interferences). Depending on the distribution set-up, it is necessary to provide for one element (Ph N) or two element for three phases (3Ph N).Protection is provided by zinc oxide varistors which are able to channel currents of up to 100 kA to earth without incurring damage. According to the latest issue of NFC 15-100 standard from 2002, it is compulsory to install those overvoltage arresters on the incoming power supply if the building is fitted with lightning conductors. Stepped protection can be achieved using DGM type arresters combined with DGT or DGX type arresters positioned downcircuit.