A surge arrester (1) includes varistor elements (2) forming a stack (3) and having opposed end surfaces (4a, 4b). The varistor stack is electrically connected via the opposed end surfaces to end terminals (7a, 7b) having circumferential ridges (32a, 32b), which, in the event of failure of the ...http://www.google.es/patents/US5818677?utm_source=gb-gplus-sharePatente US5818677 - Surge arrester having ridged terminals
