Surge protector

A surge protector, applicable to a power supply circuit of an electronic device, the surge protector comprising:

• an insulating base defining therein a receiving space and a spare space;
• a dielectric material being a polycrystalline semiconductor ceramic element containing zinc oxide, the dielectric material being provided in the receiving space;
• a first conductive plate enclosed in the insulating base and attached to a first side of the dielectric material by surface contact, the first conductive plate having a portion which extends out of the insulating base and forms a first pin;
• a second conductive plate enclosed in the insulating base and having a first side attached to a second side of the dielectric material by surface contact;
• and
• a temperature-actuated metal plate enclosed in the insulating base, the temperature-actuated metal plate having a portion which extends out of the insulating base and forms a second pin, the temperature-actuated metal plate having a first side corresponding in position to a second side of the second conductive plate and a second side corresponding in position to the spare space in the insulating base, wherein a temperature-actuated portion of the temperature-actuated metal plate lies against the second side of the second conductive plate when at a temperature lower than a threshold temperature, and the temperature-actuated portion curves toward the spare space and separates from the second conductive plate when at a temperature higher than the threshold temperature.