Patent ID: 8179224

Claim:
An overcurrent protection structure comprising: a coating made of an arc resistant material comprising a thermoplastic material or a thermosetting material, the arc resistant material further being filled with magnesium hydroxide dihydrate such that the coating absorbs heat and releases water of crystallization until a temperature in excess of a lead-free solder melting point is reached; a fusible fuse structure unit, which is encapsulated by the coating, wherein a gas filled space exists between the fusible fuse structure unit and the coating, the gas filled space extending along at least a full length of the fusible fuse structure unit, such that the fusible fuse structure makes no direct contact with the coating to prevent the heat generated by the fusible fuse structure unit from dissipating through the gas filled space to the coating; and a first electrode and a second electrode, which are respectively lead-free soldered to both ends of the fusible fuse structure unit and extend outwardly beyond the coating.