A high voltage surge arrester comprise plurality of low voltage surge arresters coupled together in a series parallel network, the low voltage arresters being of a high strength polymeric type consisting of a solid core of varistor blocks encased within a glass fibre reinforced plastics shell and housed...http://www.google.es/patents/US5218508?utm_source=gb-gplus-sharePatente US5218508 - Electrical surge arrester/diverter
