Surge protection device

A circuit protection device comprising:

• a housing defining a chamber;
• a metal oxide varistor stack including at least three metal oxide varistors disposed within a single epoxy coating, the epoxy coated metal oxide varistors disposed within the chamber;
• a first conductive spring physically connected at a first end to a first input terminal of the metal oxide varistor stack by a first thermal disconnect and at a second end to a first input line, the first input terminal extending through the single epoxy coating and disposed so that the first conductive spring is in direct electrical contact with two of the at least three metal oxide varistors, wherein the first conductive spring is biased away from the first input terminal of the metal oxide varistor stack;
• a second conductive spring physically connected at a first end to a second input terminal of the metal oxide varistor stack by a second thermal disconnect and at a second end to a second input line, the second input terminal extending through the single epoxy coating and disposed so that the second conductive spring is in direct electrical contact with two of the at least three metal oxide varistors, wherein the second conductive spring is biased away from the second input terminal of the metal oxide varistor stack;
• and
• a rigid, electrically insulating member connecting the first conductive spring to the second conductive spring and limiting relative movement therebetween wherein when an overvoltage condition occurs, heat generated by the metal oxide varistor stack melts at least one of the first or second thermal disconnects to allow the corresponding first or second conductive springs to be displaced away from the first or second input terminals of the metal oxide varistor stack to define an open circuit.