压敏电阻足对电压变化敏感的非线性电阻元件,在某一临界电压下电阻值非常高,但当超过这一临界电压时,电阻将急剧变化并有电流通过。压敏电阻的种类很多,按制造材料来分有碳化硅压敏电阻、硅压敏电阻、锗压敏电阻、钛酸钡压敏电阻及ZnO压敏电阻。 压敏电阻的主要用途是在电气电子电路中抑制浪涌电压。我们知道,在电路中经常出现浪涌电压,它们是由于原先储存的能量突然释放所引起的。这种能量可能是电路本身储存的,当电路发生换路动作时释放出来;也可能是由于电路之外通过耦合或其他途径侵 Varistor foot of the voltage sensitivity of non-linear resistance element, at a certain threshold voltage resistance is very high, but when the threshold voltage is exceeded, the resistance will be drastic changes and the current through. Varistor types, according to the manufacturing materials divided into silicon carbide varistor, silicon varistor, germanium varistor, barium titanate varistor and ZnO varistor. The main purpose of varistors is to suppress the surge voltage in electrical and electronic circuits. We know that surge voltages often appear in the circuit due to the sudden release of previously stored energy. This energy may be stored in the circuit itself, when the circuit is released when the circuit change action may also be due to the circuit through the coupling or other means of invasion