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A varistor is a "variable resistor". When its value changes it then changes the amount of electricity it drops. Some of the energy goes to do the job; some of the energy is "dumped" out as heat. How about this: the volume control on your radio is a varistor. A dimmer switch on your living room lights is a varistor.
Wiki User
∙ 16y ago
jec888
Varistor is a resistance device with non-linear volt-ampere characteristics. It is mainly used to clamp voltage when the circuit is subjected to overvoltage and absorb excess current to protect sensitive devices. Because it has the advantages of high surge withstand, large current processing and high volume absorption, fast response time and low leakage current, it is widely used in power systems, surge suppressors, motor protection, automotive electronic systems, household appliances, etc.
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How you determine correct size varistor for protect system which work with 220v AC?
You use varistor wich has the max voltage for that aplication example:vacuumcleanermax allowed voltage is 240v ac so you chose aprox. 250 V varistor.
How did the word transistor originate?
transient varistor
How do you determine correct size varistor for protect system which work with 220 v?
How i determine correct size varistor for protect system which work with 220 v AC?
What is the use of metal oxide varistor disc in Lightning arrestor?
I think your answer is given in previous question -( correct size of varistor across 24v coil) I am just pasting the same here. . . "When the voltage exceeds the clamping voltage of the varistor, it conducts current, preventing the voltage from reaching a dangerous level. If the elevated voltage is maintained for too long a time, the varistor will heat to a point where the metals in it melt and fuse together, causing a short. This also poses the posibility of a fire risk, as the current is now conducting heavily through the varistor. This is what often happens to a varistor in a power strip when lightening strikes nearby. It renders the power strip useless. But the connected devices are usually spared. "
Did varistor having polarity how you will place the component and how you will check the component status?
Varistors are not polarity sensitive. Now I'm pretty sure that the device in question is a varistor. I googled for SAS-820KD05, found several references but unfortunately no data sheet - maybe you have more luck. One main criterium for selecting a varistor is the varistor voltage - as long as the voltage applied to the varistor is below the varistor voltage, it will behave like a capacitor. When the voltage is above, e.g. caused by a transient, it acts as a resistor, shorting this transient. Another important value is the max. pulse current a varistor can withstand.
How do you install a metal oxide varistor?
A varistor is installed onto the "line" and "Neutral" wires of an AC power input.Added:Maybe this will help you more: cf. Related links, just below this answer page.
How do you determine correct size varistor on a 24vac coil?
is this coil a single shot solenoid or is it used as a filter i assume you want to know a good value for a varistor to stop voltage spikes from the reverse EMF which is aprox. 4X the input voltage. so i would say to use 2X-3X the input Voltage so 48 or 72 Volt MOV (Metal oxide varistor) You want the varistor to be several volts greater than the peak voltage of the signal across which it is connected. 24 volts is probably the RMS value of the coils voltage. Your varistor must be selected to be greater than the peak voltage. When the voltage exceeds the clamping voltage of the varistor, it conducts current, preventing the voltage from reaching a dangerous level. If the elevated voltage is maintained for too long a time, the varistor will heat to a point where the metals in it melt and fuse together, causing a short. This also poses the posibility of a fire risk, as the current is now conducting heavily through the varistor. This is what often happens to a varistor in a power strip when lightening strikes nearby. It renders the power strip useless. But the connected devices are usually spared.
How to interpret the varistor code?
Pl. see http://www.worldproducts.com/MOVDefinitions.htm
What is a device that is capable of absorbing large currents without damage called?
Metal oxide varistor
What can you spell with the letters v I s t r o a r?
varistor (yes, that's a word)
What would cause a varistor to burn?
Overload - excess voltage causes excess current, and the combination causes excess power dissipation, leading to overheating. If the varistor was included to help dampen voltage surges, then a very "dirty" supply. with large numbers of surges, can lead to overheating.
Can a varistor be used as a circuit protection device?
No, a circuit protection device must open the circuit on a fault current or overload.
