Where is the varistor better than the surge protector?

1) The varistor responds particularly fast

Varistors have behavioral characteristics similar to those of other semiconductor components. Since the transmission of the varistor is formed very quickly, the delay is only within the limits of the nanosecond level, so that it can meet various practical requirements.

2) better energy absorption of varistor

Unlike a silicon crystal diode, which has a p-n junction that is different from the inrush current, the ZnO varistor is made up of millions of P-N structures, which have better energy absorption and surge voltage capability.

3) Capacitance value of varistor

Compared with the Zener diode, the varistor has a higher capacitance value. According to different application ranges, the capacitance value of the surge protector is different. In the DC circuit, the capacitance of the varistor can both go. The utility of the coupling can also be used to suppress the multiple effects of transient overvoltage.

4) The varistor has a stable voltage under over temperature conditions

In the case of a higher breakdown voltage, once the ambient temperature exceeds the normal operating temperature range, the Zener diode's limiting voltage rises as the ambient temperature increases, and the varistor's limiting voltage exceeds the operating temperature range. The situation is still almost constant. When the leakage current of the varistor increases as the temperature of the element body increases, the limiting voltage of the varistor does not change with temperature.

5) The varistor is cheaper

Compared with diodes, varistors have the advantage of being cheaper and smaller in size.