Different use occasions, the purpose of the pressure sensitive resistance is applied, and the voltage / current stress in the pressure sensitive resistance is different, and thus the requirements of the pressure sensitive resistance are different, pay attention to this difference, it is very important for correct use. of.  
Depending on the purpose of use, the pressure sensitive resistance zone can be divided into two categories: 1 protected pressure sensitive resistance, 2 circuit function pressure sensitive resistance.  
 
Sensitive resistance  
(1) Distinguish power supply, or signal lines, data cable protection pressure sensitive resistors, to meet different technical standards.  
(2) Depending on the continuous operation of the working voltage applied to the pressure sensitive resistance, the across power line can be distinguished into two types of communication or DC, and the pressure sensitive resistance is under these two voltage stresses. The aging characteristics are different.  
(3) Depending on the abnormal overvoltage characteristics of the pressure sensitive electromicidity, the pressure sensitive resistance is divided into three types of surge suppression, high-power and high energy.  
Surge suppression: refers to a pressure-sensitive resistor for suppressing transient overvoltage such as lightning overvoltage and operating overvoltage. The appearance of such transient overvoltage is random, non-cycle, and the peak of current voltage may be very big. Most varistors belong to this.  
High power type: refers to a pressure sensitive resistor for a continuous pulse group in the absorption cycle, for example, a pressure sensitive resistance on the switching power converter, where the impact voltage period occurs, and the period can be known that the energy value is generally calculated. Out, the peak value of the voltage is not large, but the average power is quite large due to high frequency.  
High energy: refers to a pressure-sensitive voltage actuator for magnetic energy in large inductance coils such as generator excitation coil, a lifting electromagnet coil, and the main technical indicators are energy absorbing capacity. The protective function of the pressure sensor, most of which can be repeated multiple times, but sometimes it is a "one-time" protection device as a current fuse. For example, a short-circuit contact pressure sensitive resistance is connected to some current transformer loads.  
 
Circuit function pressure sensitive resistance  
The pressure sensitive resistor is mainly used in transient overvoltage protection, but its voltammetry similar to the semiconductor regulator, also makes it a variety of circuit components, such as:  
(1) DC high pressure small current regulator element, its stable voltage can be up to thousands of volts, which is unable to achieve silicon-acting tube.  
(2) Voltage fluctuation detection element.  
(3) DC battery shift elements.  
(4) a unit pressure element.  
(5) Fluorescence starter