What are the characteristics and working principles of TMOV thermal protection varistors?
December 31, 2024
TMOV thermal protection varistor is a special type of resistor that combines the functions of varistors with thermal protection mechanisms.
The characteristics of TMOV thermal protection varistor:
Thermal protection mechanism: TMOV adds temperature sensitive devices to ordinary varistor (MOV) chips.
When the current continues to increase or the MOV fails, due to the increase in current or leakage current, the temperature of the MOV body will rise to the set operating temperature. At this time, the temperature sensitive device will disconnect, cutting off the current supply to prevent the temperature of the MOV from continuing to rise, thereby avoiding possible fire risks.
Fast response: Due to the integrated thermal element being adjacent to the MOV tube, TMOV can provide fast thermal response.
Compared to most discrete solutions, its integrated configuration has lower inductance, thereby improving the clamping performance for fast overvoltage transients.
Application scope:
TMOV varistors are widely used in computers, switching power supplies, power strips
UPS、Provide effective protection for circuits in telecommunications, networks, railways, and other fields.
In summary, TMOV thermal protection varistors combine the basic characteristics of varistors with thermal protection mechanisms. They not only protect circuits in case of abnormal voltage, but also automatically disconnect when the temperature is too high, preventing risks such as fire.
Its rapid response and wide range of applications make it important in the field of electronics.