How do you use varistor in a circuit?

How do you use varistor in a circuit?

Therefore, when circuit protection from voltage surges is required, a varistor is used as a voltage protection device. When a voltage surge exceeding a specified voltage (varistor voltage) is applied, the varistor suppresses the voltage to protect the circuit.

How is varistor connected to the circuit of the television power supply?

Varistors can be connected directly across mains supplies and across semiconductor switches for protection of transistors, MOSFET’s and thyristor bridges.

Where does MOV go in circuit?

How to use a MOV in your circuit? MOV a.k.a varistors is commonly used along with fuse in parallel to the circuit that is to be protected.

How do I select varistor value?

Consider the maximum continuous voltage that will be applied to the varistor including any high line conditions (i.e., 110% or more of nominal voltage). Ratings are given for continuous sinusoidal AC and DC voltages. If a nonsinusoidal waveform is applied, the recurrent peak voltage should be limited to √2x VM(AC).

How do you check if a varistor is working?

Touch one meter probe to the free varistor lead and the other probe to the connected lead. Read the resistance on the meter. If it reads nearly infinite resistance, the varistor is still good. If it reads very low resistance, the varistor is blown.

How do I select a varistor?

Select a model to provide the required voltage-clamping characteristic A final consideration is to choose the appropriate package style to suit the application. Consider the maximum continuous voltage that will be applied to the varistor including any high line conditions (i.e., 110% or more of nominal voltage).

How does a multimeter detect metal oxide varistor?

Work the lead loose with a long-nose pliers. Turn the multimeter on and set its function knob to read resistance. Touch the meter probe tips to the MOV’s leads and measure its resistance. If it has a resistance much under 100 ohms, it has blown.

Can you remove a varistor?

You can replace it with a new one provided it is for the same voltage levels that it triggers. This AC and DC voltage ratings are the important parts and then the energy capacity. Energy cap. is not a major issue in Computer PSUs since the usually use a small varistor there.

How do I read varistor code?

What is maximum clamping voltage varistor?

Varistor Voltage (Max): Sometimes called clamping voltage (MAX), is the approximate max voltage the varistor will conduct (or pass through to the circuit) for a specified peak pulse duration without causing device failure if operated within spec.

Can a varistor go bad?

The varistor, normally having a very high resistance, responds to the voltage spike by absorbing its energy with a very low resistance. The varistor will likely be wired to a fuse holder. If the varistor is visibly burnt through or broken, it is bad; replace it.