Patent ID: 7839257

Claim:
An overvoltage protection device, comprising: a. at least one non-linear resistance element; and b. a single cut-off device coupled with the at least one non-linear resistance element to disable the at least one non-linear resistance element when the at least one non-linear resistance element reaches a pre-determined temperature, wherein the single cut-off device comprises i. a shiftable actuator; ii. a first solder having a first melting point connecting the actuator to the at least one non-linear resistance element, the actuator movable to a first shift position upon melting of the first solder; and iii. a second solder having a second melting point, higher than the first melting point, connecting the actuator to the at least one non-linear resistance element, the actuator movable to a second shift position upon melting of the second solder; and iv. a status indicator operably connected to the actuator to give a visual indication of a first condition of the non-linear resistance element at the first shift position of the actuator and a different visual indication of a second condition of the non-linear resistance element at the second shift position of the actuator.