The role of varistor in sensitive electrons

Everyone knows that the normal operation of a circuit board is not composed of capacitor resistors. It is shown in the test data that the varistor is a suitable protection device for protecting sensitive electronic components. Get to know it!

Varistors are widely used in electronic circuits to protect against damage to the circuit due to sudden changes in the voltage of the power supply system. The varistor is generally used in parallel in the circuit. When the voltage across the resistor changes abruptly, the short circuit of the resistor blows the current fuse to protect it. Varistors are used in circuits and are often used for power supply overvoltage protection and regulation. When high voltage comes, the resistance of the varistor is reduced to shunt the current to prevent excessive transient voltage damage or interference. This protects sensitive electronic components.

Many people will also have such a misunderstanding that varistor can protect sensitive electronic components and feel that varistor has a great effect. In actual circuit protection schemes, varistors cannot provide complete voltage protection. There are a variety of protective devices to form a protective circuit. Because varistor can withstand limited energy or power, it does not provide continuous overvoltage protection. Sustained overvoltage can damage the protective device (varistor) and cause damage to the equipment and may present a fire hazard. The parts that the varistor cannot provide protection include: inrush current at startup, overcurrent at short circuit, voltage drop, etc. These situations require other means of protection.