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US 2007/0182522 A1Published application
Varistor having ceramic case
OwnerBi-Yung Changinventor
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Abstract
The present invention discloses a varistor which comprises a ceramic case made from insulated refractory and at least one zinc-oxide ceramic housed in the ceramic case. The ceramic case is also filled with an insulated resin having the damp-proof effect and thus serves as a powerful clamp with enough mechanical strength against impact at high temperature. Accordingly, the varistor can be secured from flaming and explosion when the zinc-oxide ceramic is overloaded or ineffective.
Claims11
A varistor, comprising:
- at least one ceramic absorber having a positive electrode and a negative electrode;
- at least two leads respectively connected to the positive electrode and the negative electrode of the ceramic absorber and conducting surge current to the ceramic absorber for converting the surge into heat;
- a packaging resin having damp-proof and insulation properties and completely embedding the ceramic absorber therein;
- and
- a ceramic case made from insulated ceramic material sintered at high temperature, having a desired mechanical strength and nonflammability, housing the ceramic absorber and the packaging resin therein, and having at least one opening for the leads extending outside;
- according to protection of the ceramic case, the varistor will not bum and explode as the ceramic absorber is ineffective.
3 more elements
Dependencies are inferred from the claim text.