| 摘要 |
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.
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