Surge suppression is provided by varistors connected between, respectively, hot and neutral conductors and hot and ground conductors, each through a common fuse that avoids hazardous overvoltages on the varistors. A first indicator circuit portion provides an indication that the power is on and surge...http://www.google.es/patents/US5032946?utm_source=gb-gplus-sharePatente US5032946 - Electrical surge suppressor and dual indicator apparatus
Electrical surge suppressor and dual indicator apparatus
