The basic properties of metal oxide blocks

(1) metal oxide blocks has protection feature, when the impact of the strong impact of the source does not exceed a predetermined value, the varistor voltage limit must not exceed the protected object can withstand voltage shock resistance.
(2) the impact resistance, the varistor itself should be able to withstand the impact of current, impact energy, and several attacks have appeared when the average power.
(3) There are two characteristics of life, one continuous working voltage life, namely varistor specified ambient temperature and system voltage conditions should be able to work reliably specified time. Second, the impact of life, that is able to reliably withstand the impact of a predetermined number of times.
(4) After the metal oxide varistor basics intervention system, in addition to protect a "safety valve", it will also bring some additional impact, which is the so-called "secondary effects", it should not reduce the normal performance of the system. Then the main factors to be considered, there are three, one varistor own capacity, the second is the system voltage, leakage current, the third is non-linear current through the varistor coupled source impedance effects on other circuits.