Surge protection device with a varistor material wafer and a fusible element which bridges the varistor material wafer in the event of thermal overload

摘要

An overvoltage protection device (100) includes first (122) and second electrically conductive electrode members (132), a varistor member (110) formed of a varistor material and electrically connected with each of the first (122) and second electrode members (132), and an electrically conductive, meltable member (180). The meltable member (180) is responsive to heat in the device to melt and form a current flow path between the first (122) and second electrode members (132) through the meltable member (180).