Patent ID: 6838972

Claim:
A surface-mountable electrical circuit protection device comprising: a first electrically insulative substrate having only one electrode disposed thereon; a first PTC element comprised of a polymer with conductive particle dispersed therein and having a first end and a second end and a first surface and a second surface running therebetween; a second electrically insulative substrate having a first end and a second end a first electrode disposed on a first surface thereof and a second electrode disposed on a second surface thereof, the first electrode disposed on the first surface of the second substrate extends to the second end of the second substrate but not the first end of the second substrate, the second electrode dispose don the second surface of the second substrate extends to the first end of the second substrate but not the second end of the second substrate; a second PTC element comprised of a polymer with conductive particles dispersed therein and having a first end a second end and a first surface and a second surface running therebetween; a third electrically insulative substrate having only one electrode disposed thereon; the first PTC element positioned between the first and second supporting substrates such that: (i) the electrode disposed on the first substrate is also disposed on the first surface of the first PTC element and extends to the first end of the first PTC element but not the second end of the first PTC element; and (ii) the first electrode disposed on the second substrate is also disposed on the second surface of the first PTC element and extends to the second end of the first PTC element but not the first end of the first PTC element; the second PTC element positioned between the second and third supporting substrates such that: (i) the second electrode disposed on the second substrate is also disposed on the first surface of the second PTC element and extends to the first end of the second PTC element but not the second end of the second PTC element; and (ii) the electrode disposed on the third substrate is also disposed on the second surface of the second PTC element and extends to the second end of the second PTC element but not the first end of the second PTC element; a first conductive end termination wrapping around a first end of the device; and a second conductive end termination wrapping around a second end of the device.