The single-pole and multipole surge arresters of the DEHNguard® ... H LI family provide maximum safety and user-friendliness and set new standards in surge protection. With the "Pro-Active Thermo Control" concept, they are the first "intelligent" surge arresters to warn the user of failures of the surge protective device in due time. With this concept, the new SPD monitoring device meets the ever increasing requirements on the availability of electrical systems in industrial, commerc
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