Circuit protection device with PTC element and secondary fuse

A circuit protection device comprising:

• a dielectric substrate;
• a primary fuse disposed on a first side of the dielectric substrate and having first and second terminals electrically connected to respective first and second conductive traces on the dielectric substrate;
• a positive temperature coefficient (PTC) device and a secondary fuse electrically connected in series with the with one another and in parallel with the primary fuse, the PTC device attached to a second side of the dielectric substrate by a dielectric cap covering an end of the PTC device, the secondary fuse comprising a quantity of solder extending from a first electrode of the PTC device onto the dielectric cap, wherein the dielectric cap exhibits a de-wetting characteristic relative to the solder such that, when the solder is melted, the solder draws away from the dielectric cap to create a galvanic opening;
• and
• a first lead wire and a second lead wire for electrically connecting the circuit protection device within a circuit, wherein the first lead wire is electrically connected to the first terminal of the primary fuse and to the secondary fuse, and wherein the second lead wire is electrically connected to the second terminal of the primary fuse and to a second electrode of the PTC device;
• wherein the first and second lead wires are connected to the first and second terminals of the primary fuse, respectively, by first and second electrically conductive vias formed in the dielectric substrate.