Overvoltage protection devices with temperature-based failsafe

An overvoltage protection device comprising:

• one or more overvoltage protection components, wherein at least one overvoltage protection component of the one or more overvoltage protection components generates heat when at its end of life;
• and
• a failsafe component in thermal communication with the one or more overvoltage protection components, the failsafe component comprising:
• a first set of one or more electrical contacts on a first surface of a first substrate;
• a second set of one or more electrical contacts on a second surface of a second substrate, wherein the first surface and the second surface face each other;
• and
• a spacer between the first surface and the second surface configured to space apart the first set of one or more electrical contacts and the second set of one or more electrical contacts when the spacer is coupled to at least one of the first substrate or the second substrate via a thermal sensitive component such that the failsafe component is biased to a non-conductive configuration;
• wherein the spacer is configured to decouple from one or both of the first substrate and the second substrate when the thermal sensitive component is exposed to at least a threshold temperature corresponding to the heat generated by the at least one overvoltage protection component to cause the failsafe component to transition to a conductive configuration;
• and
• wherein the first set of one or more electrical contacts and the second set of one or more electrical contacts are in contact with each other when in the conductive configuration and create a short circuit to interrupt power supply.