A surge protective device module comprising: a module housing; first and second module electrical terminals (166A, 168A) mounted on the module housing; an overvoltage clamping element electrically connected between the first and second module electrical terminals; and a thermal disconnector mechanism positioned in a ready configuration, wherein the overvoltage clamping element is electrically connected with the second module electrical terminal, the thermal disconnector mechanism being repositionable to electrically disconnect the overvoltage clamping element from the second module electrical terminal, the thermal disconnector mechanism including: an electrode electrically connected to the overvoltage clamping element; a disconnect spring elastically deflected and electrically connected to the electrode in the ready configuration; a solder securing the disconnect spring in electrical connection with the electrode in the ready configuration; and a heat sink member thermally interposed between the electrode and the solder, the heat sink member having a thermal capacity; wherein the solder is meltable in response to overheating of the overvoltage clamping element; wherein the disconnect spring is configured to electrically disconnect the overvoltage clamping element from the second module electrical terminal when the solder is melted; and wherein the thermal capacity of the heat sink member buffers and dissipates heat from the overvoltage clamping element to prevent the solder from melting in response to at least some surge currents through the SPD module; characterized in that the electrode includes: a base portion engaging the overvoltage clamping element; and an integral upstanding termination tab connecting the base portion to the heat sink member. a module housing; first and second module electrical terminals (166A, 168A) mounted on the module housing; an overvoltage clamping element electrically connected between the first and second module electrical terminals; and a thermal disconnector mechanism positioned in a ready configuration, wherein the overvoltage clamping element is electrically connected with the second module electrical terminal, the thermal disconnector mechanism being repositionable to electrically disconnect the overvoltage clamping element from the second module electrical terminal, the thermal disconnector mechanism including: an electrode electrically connected to the overvoltage clamping element; a disconnect spring elastically deflected and electrically connected to the electrode in the ready configuration; a solder securing the disconnect spring in electrical connection with the electrode in the ready configuration; and a heat sink member thermally interposed between the electrode and the solder, the heat sink member having a thermal capacity; an electrode electrically connected to the overvoltage clamping element; a disconnect spring elastically deflected and electrically connected to the electrode in the ready configuration; a solder securing the disconnect spring in electrical connection with the electrode in the ready configuration; and a heat sink member thermally interposed between the electrode and the solder, the heat sink member having a thermal capacity; wherein the solder is meltable in response to overheating of the overvoltage clamping element; wherein the disconnect spring is configured to electrically disconnect the overvoltage clamping element from the second module electrical terminal when the solder is melted; and wherein the thermal capacity of the heat sink member buffers and dissipates heat from the overvoltage clamping element to prevent the solder from melting in response to at least some surge currents through the SPD module; characterized in that the electrode includes: a base portion engaging the overvoltage clamping element; and an integral upstanding termination tab connecting the base portion to the heat sink member. a base portion engaging the overvoltage clamping element; and an integral upstanding termination tab connecting the base portion to the heat sink member.