Ensto Distribution Class Surge Arresters

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ENSTO Type HE Surge Arrester Surge Arresters protect Distribution systems and their equipment against over-voltages.They are key assets to improve power quality, to reduce outage c osts, and to increase lifetime of protected equipment.Our VARISIL™ HE are certified as Distribution Heavy Duty (HD), according to IEEE C62.11 VARISIL™ HE have been manufactured in Ensto's French factory located at Bagnères de Bigorre for more than 20 years; more than 5 million units are in service worldwide. Design: VARISIL™ HE are polymer housed gapless metal-oxide surge arresters. The MO resistors are wrapped by a fiberglass reinforced epoxy resin, and then housed by a silicone rubber housing. Thanks to their optimized discharge voltages, VARISIL™ HE arresters can be used for both standard and riser pole applications. Operating Conditions & Performance Characteristics • Ambient air temperatur : -50°C to +50°C (-58°F to 122°F)• MCOV: from 2.55 kV to 29 kV• Lightning impulse classifying current Iclass : 10 kA• High current impuls : 100 kA• Single impulse charge transfer rating Qrs : 0.49 C• Thermal charge transfer rating Qth: 1.1 C• Rated short circuit current Is: 20 kA• Maximum design cantilever load: 100 Nm (75 ft lbf) ENSTO Type HE Surge Arrester Brochure Show more