Abstract: An integrated over-current protection device includes a positive temperature coefficient (PTC) component, a first conductive unit, a second conductive unit, a first conductive via, and a second conductive via. The PTC component includes a first PTC body, and has opposing first and second surfaces. The first conductive unit is disposed on the first surface, and includes a first electrode and a first conductive pad electrically insulated from the first electrode. The second conductive unit is disposed on the second surface, and includes a second electrode and a second conductive pad electrically insulated from the second electrode. The first conductive via extends through the first conductive unit and the PTC component to electrically connect the first electrode to the second conductive pad. The second conductive via extends through the second conductive unit and the PTC component to electrically connect the second electrode to the first conductive pad.

Abstract: An over-voltage circuit protection device includes a voltage-dependent resistor component, and a printed circuit board (PCB) component connected to the voltage-dependent resistor component through first and second conductive lead layers. The PCB component includes a PCB body, a first conductive portion, a second conductive portion, at least one first conductive via and at least one second conductive via. The first and second conductive portions are disposed on the PCB body, and are electrically insulated from each other. The first and second conductive vias extend through the PCB body, and are defined by via-defining walls respectively covered by the first and second conductive portions.

Abstract: A hybrid circuit protection device includes a positive temperature coefficient (PTC) component, a voltage-dependent resistor, a gas discharge tube (GDT), and first and second conductive leads that are respectively connected to the PTC component and the GDT. The voltage-dependent resistor and the PTC component are electrically connected in series, the GDT is electrically connected to the voltage-dependent resistor and the PTC component, and the GDT has a breakdown voltage greater than a varistor voltage of the voltage-dependent resistor as determined at 1 mA.

Abstract: A composite circuit protection device includes a positive temperature coefficient (PTC) component, first and second conductive leads, a solder and a diode component that is connected to the PTC component through the solder. The solder includes a first alloy material having a first melting point, and a second alloy material having a second melting point that is lower than the first melting point. Each of the first and second melting points is independently greater than 190° C. and not greater than 308° C. The first and second conductive leads are respectively bonded to the PTC component and the diode component.

Abstract: A composite circuit protection device includes: a first positive temperature coefficient (PTC) component; a first voltage-dependent resistor (VDR); a second VDR; and a plurality of conductive leads that correspondingly connect to the first PTC component, the first VDR and the second VDR. The second VDR and the first PTC component are electrically connected in series, the first VDR is electrically connected to the series connection of the first PTC component and the second VDR in parallel, and the first VDR has a varistor voltage greater than that of the second VDR as determined at 1 mA.

Abstract: A composite circuit protection device includes: a first positive temperature coefficient (PTC) component; a first voltage-dependent resistor (VOR); a second VOR; and a plurality of conductive leads that correspondingly connect to the first PTC component, the first VOR and the second VOR. The second VOR and the first PTC component are electrically connected in series, the first VOR and the second VOR are electrically connected in parallel, the first PTC component and the first VOR are electrically connected in parallel, and the first VOR has a varistor voltage greater than that of the second VOR as determined at 1 mA.

Abstract: A PTC circuit protection device includes a PTC polymeric layer; a first electrically conductive layer electrically connected to the PTC polymeric layer; a second electrically conductive layer electrically connected to the PTC polymeric layer; an insulation layer unit disposed on the first and second electrically conductive layers; a first electrode formed on the insulation layer unit and electrically connected to the first electrically conductive layer; and a second electrode formed on the insulation layer unit and electrically connected to the second electrically conductive layer, wherein the first electrode is formed with a first recess.

Abstract: A composite circuit protection device includes: a positive temperature coefficient (PTC) component which includes a positive temperature coefficient (PTC) layer that has two opposite surfaces, and first and second electrode layers that are respectively disposed on the two opposite surfaces of the PTC layer; a diode component that is connected to the second electrode layer of the PTC component; a first conductive lead that is bonded to the first electrode layer of the PTC component; and a second conductive lead that is bonded to the diode component. The PTC component has a rated voltage that ranges between 50% and 250% of a breakdown voltage of the diode component as determined at 1 mA.

Abstract: A composite circuit protection device includes first and second positive temperature coefficient (PTC) components, a voltage-dependent resistor, and first, second and third conductive leads. The first PTC component includes a first PTC layer, and first and second electrode layers respectively disposed on two opposite surfaces of the first PTC layer. The second PTC component includes a second PTC layer, and third and fourth electrode layers respectively disposed on the two opposite surfaces of the second PTC layer. The voltage-dependent resistor is connected to the second and third electrode layers. The first, second and third conductive leads are bonded to the first electrode layer, the voltage-dependent resistor, and the fourth electrode layer, respectively.

Abstract: An over-current protection device includes first and second electrodes and a positive temperature coefficient (PTC) multilayered structure disposed between the first and second electrodes. The PTC multilayered structure includes a first polymer layer that is bonded to the first electrode, an intermediate layered unit that is bonded to said first polymer layer and that includes a second polymer layer, a third polymer layer that is bonded to and disposed between the intermediate layered unit and the second electrode. The first, second and third polymer layers respectively have first, second and third volume resistances, the second volume resistance being higher than the first and third volume resistances.

Abstract: A composite circuit protection device includes first and second positive temperature coefficient (PTC) components, a voltage-dependent resistor, and first, second and third conductive leads. The first PTC component includes a first PTC layer, and first and second electrode layers respectively disposed on two opposite surfaces of the first PTC layer. The second PTC component includes a second PTC layer, and third and fourth electrode layers respectively disposed on the two opposite surfaces of the second PTC layer. The voltage-dependent resistor is connected to the second and third electrode layers. The first, second and third conductive leads are bonded to the first electrode layer, the voltage-dependent resistor, and the fourth electrode layer, respectively.

Abstract: A over-current protection device includes a positive temperature coefficient (PTC) polymeric element having two opposite surfaces, two electrodes respectively connected to the surfaces of the PTC polymeric element, and a power-free trip indicator disposed on at least one of the electrodes for sensing temperature of the over-current protection device.

Abstract: A composite circuit protection device includes a positive temperature coefficient (PTC) component, a voltage-dependent resistor (VDR), and first and second conductive leads respectively bonded to the PTC component and the VDR. The PTC component includes a PTC layer having two opposite PTC surfaces, and first and second electrode layers each having an electrode surface which connects to and has an area smaller than that of a respective one of the PTC surfaces. The VDR includes a VDR layer having two opposite resistor surfaces, and third and fourth electrode layers each having an electrode surface which connects to and has an area smaller than that of a respective one of the resistor surfaces.

Abstract: A over-current protection device includes a positive temperature coefficient (PTC) polymeric element having two opposite surfaces, two electrodes respectively connected to the surfaces of the PTC polymeric element, and a power-free trip indicator disposed on at least one of the electrodes for sensing temperature of the over-current protection device.

Abstract: A composite circuit protection device includes a positive temperature coefficient (PTC) component, a voltage-dependent resistor, a first conductive lead and a second conductive lead. The PTC component includes a PTC polymeric layer, and first and second electrode layers respectively disposed on two opposite surfaces of the PTC polymeric layer. The voltage-dependent resistor is connected to the second electrode layer of the PTC component. The first and second conductive leads are respectively bonded to the first electrode layer of the PTC component and the voltage-dependent resistor. The PTC component has a rated voltage ranging between 40% and 200% of a varistor voltage of the voltage-dependent resistor.

Abstract: A PTC circuit protection device includes a PTC polymer material and two electrodes attached to the PTC polymer material. The PTC polymer material includes a polymer matrix and a particulate conductive filler dispersed in the polymer matrix. The polymer matrix is made from a polymer composition that contains a non-grafted polyolefin. The conductive filler includes first tungsten carbide particles having a first average Fisher sub-sieve particle size of less than 2.5 ?m and a first particle size distribution with a particle size D10 being less than 2.0 ?m and a particle size D100 being less than 10.0 ?m.

Abstract: A PTC circuit protection device includes a PTC polymer material and two electrodes attached to the PTC polymer material. The PTC polymer material includes a polymer matrix and a particulate conductive filler dispersed in the polymer matrix. The polymer matrix is made from a polymer composition that contains a non-grafted polyolefin. The conductive filler includes first tungsten carbide particles having a first average Fisher sub-sieve particle size of less than 2.5 ?m and a first particle size distribution with a particle size D10 being less than 2.0 ?m and a particle size D100 being less than 10.0 ?m.

Abstract: An over-current protection device includes first and second electrodes and a positive temperature coefficient (PTC) multilayered structure disposed between the first and second electrodes. The PTC multilayered structure includes a first polymer layer that is bonded to the first electrode, an intermediate layered unit that is bonded to said first polymer layer and that includes a second polymer layer, a third polymer layer that is bonded to and disposed between the intermediate layered unit and the second electrode. The first, second and third polymer layers respectively have first, second and third volume resistances, the second volume resistance being higher than the first and third volume resistances.

Abstract: A composite circuit protection device includes a polymer positive temperature coefficient (PPTC) component, a voltage-dependent resistor, a first conductive lead and a second conductive lead. The PPTC component is formed with a hole and includes a positive temperature coefficient (PTC) polymeric layer, and first and second electrode layers respectively disposed on two opposite surfaces of the PTC polymeric layer. The hole is formed in the PTC polymeric layer. The voltage-dependent resistor is connected to the second electrode layer of the PPTC component. The first and second conductive leads are respectively bonded to the first electrode layer of the PPTC component and the voltage-dependent resistor.

Abstract: An over-current protection device includes first and second electrodes, and a positive temperature coefficient multilayered structure including first, second, and third polymer layers. The first polymer layer is bonded to the first electrode and includes a polymer matrix made from a polymer composition containing a grafted olefin-based polymer. The second polymer layer has a through hole and includes a polymer matrix made from a polymer composition containing a non-grafted olefin-based polymer and substantially free of a grafted olefin-based polymer. The third polymer layer is bonded to the second electrode and includes a polymer matrix made from a polymer composition containing a grafted olefin-based polymer.