What is a MOV varistor

Electronic components shuttle through our lives. Common varistors in household appliances include safety capacitors, varistors, high-voltage capacitors, etc. I believe everyone is familiar with it. What is the role of piezoresistance in rice cookers? Rheostat is an action element with abnormal voltage. Generally speaking, it is a very small and poor circuit design. The rheostat is connected in parallel with the power incoming line, and the power line needs to be connected with the fuse(in front of the rheostat). When the action voltage higher than the rheostat enters the power supply line, the action of the rheostat(short circuit of the rheostat, short circuit of the power supply line)will blow the fuse to protect the following thingsNow let's introduce theMOVvaristor to you. I hope you can know more aboutMOVvaristor

MOVVaristor is mainly used for the surge of low-voltage apparatusProtection, most of which are zinc oxide varistors. It is a polycrystalline semiconductor ceramic component made of zinc oxide as the main body, doped with various metal oxides, and made of typical electronic ceramic technology. The varistor has a symmetrical voltage-ampere characteristic curve, flowing throughMOVcurrent followsMOVThe voltage at both ends increases exponentially. In practical applications,MOVThe circuit is generally parallel. When the circuit works normally, it is in a high impedance state, which does not affect the normal operation of the circuit. When the abnormal transient overvoltage occurs in the circuit and reaches its conduction voltage(Voltage sensitive voltage),MOVThe varistor quickly changes from high resistance state to low resistance state, releases the transient overcurrent caused by abnormal transient overvoltage, and clamps the abnormal transient overvoltage within a safe level, thus protecting the subsequent circuit from the damage of abnormal transient overvoltage.MOVVaristors have high instantaneous pulse absorption capacity and large capacitance, and are generally used for lightning protection of AC input terminals. Because the surge absorption capacity of varistors depends on their physical size, different transient surge current values can be obtained by manufacturing varistors of different sizes.