A pellet composition for use in a thermally-actuated, current cutoff device, the pellet composition comprising: one or more organic compounds selected from the group consisting of: m-phenylenedibenzoate, dimethyl terephthalate, p-acetotoluidide, benzanilide, 2',6'-acetoxylidide, dimethylacetanilide, 7-hydroxy-4-methylcoumarin, coumarin and combinations thereof present at greater than or equal to 93% by weight of a total pellet composition; and one or more inorganic stability additive solid particles selected from the group consisting of: fumed silica, talc, siloxane, and combinations thereof, wherein the fumed silica is present at greater than or equal to 1% by weight to less than or equal to 2% by weight of the total pellet composition; or the talc is present at greater than or equal to 1% by weight to less than or equal to 2% by weight of the total pellet composition; or the siloxane powder is present at greater than or equal to 0.8% by weight to less than 2.9% by weight of the total pellet composition; or a combination of fumed silica at greater than or equal to 1% by weight to less than or equal to 2% by weight of the total pellet composition and talc at greater than or equal to 1% by weight to less than or equal to 2% by weight of the total pellet composition; wherein the pellet composition is in a solid phase and maintains its structural rigidity up to a transition temperature (T f) and the pellet composition has a maximum dielectric capability temperature (T cap) above which the pellet composition loses substantial dielectric properties so that the pellet composition is capable of maintaining a 500 volt 60 Hz sinusoidal AC potential between two electrodes for at least one minute without conducting greater than 250 mA and maintaining a minimum insulation resistance across open electrodes of at least 0.2 MQ at 500 volts DC, as measured according to IEC 60691 3RD Ed, Clause 10.4 and Amendment 1 and conducts current that is 50°C or greater than the T f. one or more organic compounds selected from the group consisting of: m-phenylenedibenzoate, dimethyl terephthalate, p-acetotoluidide, benzanilide, 2',6'-acetoxylidide, dimethylacetanilide, 7-hydroxy-4-methylcoumarin, coumarin and combinations thereof present at greater than or equal to 93% by weight of a total pellet composition; and one or more inorganic stability additive solid particles selected from the group consisting of: fumed silica, talc, siloxane, and combinations thereof, wherein the fumed silica is present at greater than or equal to 1% by weight to less than or equal to 2% by weight of the total pellet composition; or the talc is present at greater than or equal to 1% by weight to less than or equal to 2% by weight of the total pellet composition; or the siloxane powder is present at greater than or equal to 0.8% by weight to less than 2.9% by weight of the total pellet composition; or a combination of fumed silica at greater than or equal to 1% by weight to less than or equal to 2% by weight of the total pellet composition and talc at greater than or equal to 1% by weight to less than or equal to 2% by weight of the total pellet composition; wherein the pellet composition is in a solid phase and maintains its structural rigidity up to a transition temperature (T f) and the pellet composition has a maximum dielectric capability temperature (T cap) above which the pellet composition loses substantial dielectric properties so that the pellet composition is capable of maintaining a 500 volt 60 Hz sinusoidal AC potential between two electrodes for at least one minute without conducting greater than 250 mA and maintaining a minimum insulation resistance across open electrodes of at least 0.2 MQ at 500 volts DC, as measured according to IEC 60691 3RD Ed, Clause 10.4 and Amendment 1 and conducts current that is 50°C or greater than the T f.