What are the basic properties of varistors
Jan 10, 2021
(1) There are two life characteristics. One is the continuous working voltage life, that is, the varistor should be able to work reliably for the specified time (hours) under the specified ambient temperature and system voltage conditions. The second is the impact life, that is, the number of times that it can reliably withstand the specified impact.
(2) After the varistor intervenes in the system, in addition to the protection of the "safety valve", it will also bring some additional effects, which is the so-called "secondary effect", which should not reduce the normal working performance of the system. There are three main factors to consider at this time, one is the capacitance of the varistor itself (tens to tens of thousands of PF), the second is the leakage current under the system voltage, and the third is the non-linear current of the varistor through the source impedance. The impact of coupling on other circuits.
