Patent ID: 7623019

Claim:
A varistor, comprising three ceramic layers, six electrodes and a plurality of leads, wherein: the three ceramic layers are arranged in parallel and defined as a 1st varistor, a 2nd varistor and a 3rd varistor in order; the six electrodes are defined as a 1st electrode and a 2nd electrode respectively disposed on both sides of the 1st varistor; a 3rd electrode and a 4th electrode respectively disposed on both sides of the 2nd varistor; and a 5th electrode and a 6th electrode respectively disposed on both sides of the 3rd varistor; and the plurality of leads are properly connected to the electrodes to form a three- or single-phase varistor; wherein the plurality leads are defined as a 1st lead with one end connected to the 1st electrode, a 2nd lead with one end connected to the 2nd electrode and the 3rd electrode, a 3rd lead with one end connected to the 4th electrode and the 5th electrode, and a 4th lead with one end connected to the 6th electrode.