Varistor having ceramic case
AssigneePowertech Industrial Co., Ltd.
InventorBi-Yung Chang
Life of this patent
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Abstract
A varistor for protecting a power circuit from explosion and flaming is disclosed. The varistor includes a surge absorber sintered at a first predetermined temperature and having a plurality of electrodes, a plurality of leads connected to the electrodes respectively, a coating enrobing the surge absorber, and the ceramic case sintered at a second predetermined temperature and housing the surge absorber and the coating. The second predetermined temperature is higher than the first predetermined temperature. The ceramic case has a plurality of openings for the leads to extend outside of the ceramic case. The ceramic case is made from Al2O3, SiO2 and MgO.
Claims30
A varistor comprising:
- a surge absorber sintered at a first predetermined temperature and having a first electrode and a second electrode;
- a first lead having a first end and a second end thereof, wherein the first end connected to the first electrode;
- a second lead having a first end and a second end thereof, wherein the first end connected to the second electrode;
- a coating enrobing the surge absorber and the first ends of the first lead and the second lead;
- and
- a ceramic case sintered at a second predetermined temperature higher than the first predetermined temperature, housing the surge absorber and the coating, having a first opening and a second opening, and made of Magnesium Oxide (MgO), Silicon dioxide (SiO2) and 25 to 99 weight percent Aluminum Oxide (Al2O3), wherein the second ends of the first lead and the second lead penetrate respectively the first opening and the second opening.
A varistor comprising:
- a surge absorber sintered at a first predetermined temperature and having a first electrode and a second electrode;
- a first lead having a first end and a second end thereof, wherein the first end connected to the first electrode;
- a second lead having a first end and a second end thereof, wherein the first end connected to the second electrode;
- a coating enrobing the surge absorber and the first ends of the first lead and the second lead;
- and
- a ceramic case sintered at a second predetermined temperature higher than the first predetermined temperature, housing the surge absorber and the coating, having a first opening and a second opening, and made of Aluminum Oxide (Al2O3), Magnesium Oxide (MgO) and 15 to 60 weight percent Silicon dioxide (SiO2), wherein the second ends of the first lead and the second lead penetrate respectively the first opening and the second opening.
A varistor comprising:
- a surge absorber sintered at a first predetermined temperature and having a first electrode and a second electrode;
- a first lead having a first end and a second end thereof, wherein the first end connected to the first electrode;
- a second lead having a first end and a second end thereof, wherein the first end connected to the second electrode;
- a coating enrobing the surge absorber and the first ends of the first lead and the second lead;
- and
- a ceramic case sintered at a second predetermined temperature higher than the first predetermined temperature, housing the surge absorber and the coating, having a first opening and a second opening, and made of Aluminum Oxide (Al2O3), silicon dioxide (SiO2) and 15 to 40 weight percent magnesium oxide (MgO), wherein the second ends of the first lead and the second lead penetrate respectively the first opening and the second opening.
Dependencies are inferred from the claim text.