Electrical transient surge protection of electrical equipment downstream from a power source plus safeguarding of apparatus for providing such surge protection against failure at high currents or high temperature. Non-linear over-voltage means, such as varistors, function to clip transient voltage surges...http://www.google.es/patents/US5140491?utm_source=gb-gplus-sharePatente US5140491 - TVSS apparatus with ARC-extinguishing
