The role of high performance and High Performance Varistor

mov varistor what's the use? The most important feature High Performance Varistor is added on top of it when a voltage lower than its threshold "UN" when little current flowing through it, the equivalent of a shut valve when the voltage exceeds the UN, its resistance becomes smaller, so that makes it the current flowing through the surge change on other circuits is unlikely to reduce applied voltage sensitive circuitry on the follow-up. Using this feature, you can suppress the circuit often appear abnormal over-voltage, over-voltage protection circuit from damage.
For example: Our household power circuit TV on the use of zinc oxide varistors efficient, high breakdown Varistor for counter used here is 470V, the maximum surge voltage when the transient (non-RMS) when more than 470V High Performance Varistor is a manifestation of his clamping characteristics, the high voltage is pulled down, so that the subsequent circuit work within a safe