Polytronics Technology Corporation

Zhen-Yu Dong

Fu-Hua Chu

Yao-Te Chang

Yung-Hsien Chang

Hsiu-Che Yen

An over-current protection device comprises first and second electrode layers and a PTC material layer laminated therebetween. The PTC material layer comprises a polymer, an electrically conductive filler and a metal compound filler. The PTC material layer comprises the polymer of 50-70% by volume, and the electrically conductive filler and the metal compound filler are distributed in the polymer. The metal compound filler has a particle size D50 of 2-15 &#x3bc;m and 5-20% by volume and is selected from the group consisting of aluminum nitride, aluminum hydroxide, aluminum oxide, titanium oxide and zirconium oxide. The over-current protection device has a resistivity of 0.7-1.2 &#x3a9;&#xb7;cm.

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Tainan, Taiwan

Zhen-Yu Dong