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# What will happen to the circuit after the breakdown of the varistor

Views: 0     Author: Site Editor     Publish Time: 2018-04-12      Origin: Site

Varistor is a resistor whose resistance value varies with the voltage in a certain current and voltage range, which can also be said to be a resistor whose resistance value is sensitive to the voltage. Varistors are named for their use and are called surge attractors or shock suppressor (absorbers).

Varistors have three functions in each circuit: one overvoltage protection, two lightning resistance requirements, and three ampere test requirements.

The voltage protection function of varistor in the circuit, generally can cooperate with the fuse to make the lightning stroke or other overvoltage protection. Usually used to protect against lightning; when an overvoltage occurs, the varistor is broken down, resulting in a short circuit, thereby placing its two voltage clamps at a lower level, and the overcurrent caused by the short circuit will destroy the front safety tube or force the air switch to trip, To force the power off. Generally speaking, it has little effect on other components after it is damaged. Check only the circuit elements connected to it. If it is breakdown damage, it will blow the fuse.

When working at a normal voltage (the voltage in the circuit is less than the rated voltage of the varistor) the resistance of the varistor is infinite and does not work in the circuit.

When the voltage in the circuit exceeds the voltage-sensitive voltage, the resistance of the varistor will drop rapidly, which will play the role of shunt voltage limiting, and the fuse in the circuit will fuse and play a protective role. If there is no fuse in the circuit, the varistor will burst, damage and failure, loss of protection, resulting in the subsequent circuit burn.

Play a protective role, such as no fuse in the circuit, the varistor will burst, damage failure, loss of protection, resulting in the back of the circuit burned.

The voltage protection function of varistor in the circuit, generally can cooperate with the fuse to make the lightning stroke or other overvoltage protection. Usually used to protect against lightning; when an overvoltage occurs, the varistor is broken down, resulting in a short circuit, thereby placing its two voltage clamps at a lower level, and the overcurrent caused by the short circuit will destroy the front safety tube or force the air switch to trip, To force the power off. Generally speaking, it has little effect on other components after it is damaged. Check only the circuit elements connected to it. If it is breakdown damage, it will blow the fuse.

When working at a normal voltage (the voltage in the circuit is less than the rated voltage of the varistor) the resistance of the varistor is infinite and does not work in the circuit.

When the voltage in the circuit exceeds the voltage-sensitive voltage, the resistance of the varistor will drop rapidly, which will play the role of shunt voltage limiting, and the fuse in the circuit will fuse and play a protective role. If there is no fuse in the circuit, the varistor will burst, damage and failure, loss of protection, resulting in the subsequent circuit burn.

The varistor can usually cooperate with the fuse for lightning strike or other overvoltage protection. When the voltage in the circuit exceeds the voltage-sensitive voltage, the resistance value of the varistor will drop rapidly, which will play the role of shunt limiting voltage, and the fuse in the circuit will fuse. Play a protective role, such as no fuse in the circuit, the varistor will burst, damage failure, loss of protection, resulting in the back of the circuit burned.