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Application examples that require self-recovery thermal protection are refrigerators, electric washing machines, electric dryers, cooling fans, pumps, etc. According to the action characteristics: it can be divided into open and closed actions, and normally closed actions.

According to volume: it can be divided into basic large volume and thin type.

Thermal protection impulse discharge voltage: the discharge voltage of the overvoltage protector under the effect of standard shock wave. Current value: after the overvoltage protector is in action, there is a delay in the flow of lightning products, and the voltage of the overvoltage protector itself. Because the lightning current passing through the overvoltage protector in the substation is generally blocked by the linear impedance, it usually does not exceed 8kA; therefore, for overvoltage protectors with lower rated voltages, the current value is measured according to the impulse current with a waveform of 1.2/50μs and an amplitude of 8kA, and it is expressed as UC5. Its impulse discharge voltage is the same as the current value under 8kA.

The overvoltage protection device is a new type of overvoltage protection equipment, which is mainly used in 35KV and below power supply systems. It is used to prevent lightning overvoltage, high-voltage circuit breaker operation overvoltage and various transient overvoltages that may occur in the power supply system. It can effectively protect the insulation of electrical equipment such as motors, transformers, switches, capacitors, cables, bus ducts, etc. from damage, and can play a reliable blocking role for both single-color and relative overvoltage. There are many types of integrated overvoltage protection devices, which gives us a lot of room for application selection, but at the same time makes us more cautious in choosing.