Radial-leaded over-current protection device
US9147509B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 2014 |
| Grant date | Sep 29, 2015 |
| Priority date | — |
| Expiry date | Jun 11, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01C1/028
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A radial-leaded over-current protection device includes a PTC device, first and second electrode leads and an insulating encapsulation layer. The PTC device has first and a second conductive layers and a PTC material layer therebetween. The PTC material layer has a resistivity less than 0.18 Ω-cm and includes crystalline polymer and conductive ceramic filler. The ceramic filler has a resistivity less than 500 Ω-cm and is 35-65% by volume of the PTC material layer. The first electrode lead has an end connecting to the first conductive layer, whereas the second electrode lead has an end connecting to the second conductive layer. The insulating encapsulation layer wraps the PTC device and the ends of the conductive layers. The radial-leaded over-current protection device at 25° C. has a value of hold current thereof divided by an area of the PTC device ranging from 0.027-0.3A/mm2. Each electrode lead has a cross-sectional area of at least 0.16 mm2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.