Oxide Varistor

Oxide Varistor

Metal Oxide Varistor MOV has blown inside PCB?

I'm trying to fix this PCB that has a MOV metal oxide varistor blown. It blew after a power outage. Unfortunatley I'm unable to get any info from the blown MOV it shattered & burnt to a crisp LOL. Will any MOV work as a replacement? The PCB is from a motor controller for a treadmill connected to regular home 120V current

Any MOV designed for 120 VAC use should work just fine. Check that is approx. of the same size of the one which blown (same energy rating).

The MOV is a protection device, then, if you remove it from the PCB your treadmill should work without problem, of course, it is not going to have the protection of the MOV (protection against high voltage spikes).

You also have to check all the fuses in your machine, someone must be gone also. If you do not have any fuse you have to have some kind of "breaker" which you have to reset.

By the way, Andy does not know what he is saying, he is a Google search poster.

Calcium Oxide $93.99 High Quality Content by WIKIPEDIA articles Calcium oxide (CaO), commonly known as quicklime, is a widely used chemical compound. It is a white, caustic and alkaline crystalline solid at room temperature. As a commercial product, lime often also contains magnesium oxide, silicon oxide and smaller amounts of aluminium oxide and iron oxide. Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 128 Publication Date: 2010/07/17 Language: English Dimensions: 5.98 x 9.01 x 0.30 inches

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Sodium Oxide $81.25 High Quality Content by WIKIPEDIA articles Sodium oxide (SOX) is a chemical compound with the formula Na2O. It is used in ceramics and glasses. Treatment with water affords sodium hydroxide.In the typical application, glass contains around 15 sodium oxide, the other components being silica (silicon dioxide) and lime (calcium oxide) at around 70 and 9, respectively. The soda serves as a flux to lower the temperature at which the silica melts. Soda glass has a lower melting temperature vs pure silica, and has improved mechanical properties due to its slight increases in elasticity. These changes arise because the silicon dioxide and soda react to form sodium silicates of the general formula Na2 SiO2]x SIO3]. Author: Surhone, Lambert M./ Timpledon, Miriam T./ Marseken, Susan F. Binding Type: Paperback Number of Pages: 114 Publication Date: 2010/07/18 Language: English Dimensions: 6.00 x 9.02 x 0.27 inches

Magnesium Oxide $62.13 High Quality Content by WIKIPEDIA articles Magnesium oxide, or magnesia, is a white solid mineral that occurs naturally as periclase and is a source of magnesium (see also oxide). It has an empirical formula of MgO. It is formed by an ionic bond between one magnesium and one oxygen atom. Magnesium oxide is hygroscopic in nature and care must be taken to protect it from moisture. Magnesium hydroxide forms in the presence of water (MgO + H2O Mg(OH)2), but it can be reversed by heating it to separate moisture. Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 68 Publication Date: 2010/11/23 Language: English Dimensions: 9.02 x 5.98 x 0.16 inches

Lithium Oxide $60.54 High Quality Content by WIKIPEDIA articles Lithium oxide (Li2O) or lithia is an inorganic chemical compound. Lithium oxide is formed along with small amounts of lithium peroxide when lithium metal is burned in the air and combines with oxygen: 4Li+O2 2Li2O. Pure Li2O can be produced by the thermal decomposition of lithium peroxide, Li2O2 at 450 C 2Li2O2 2Li2O + O2 Structure In the solid state lithium oxide adopts an antifluorite structure which is related to the CaF2, fluorite structure with Li cations substituted for fluoride anions and oxide anions substituted for calcium cations. The ground state gas phase Li2O molecule is linear with a bond length consistent with strong ionic bonding. VSEPR theory would predict a bent shape similar to H2O. Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 68 Publication Date: 2010/08/03 Language: English Dimensions: 6.00 x 9.02 x 0.16 inches

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Rubidium Oxide $70.1 High Quality Content by WIKIPEDIA articles Rubidium oxide is the chemical compound with the formula Rb2O. Rubidium oxide is highly reactive towards water, and therefore it would not be expected to occur naturally. The rubidium content in minerals is often calculated and quoted in terms of Rb2O. In reality, the rubidium is typically present as a component of (actually, an impurity in) silicate or aluminosilicate. A major source of rubidium is lepidolite, KLi2Al(Al,Si)3O10(F,OH)2 wherein Rb sometimes replaces K. Rb2O is a yellow colored solid. The related species Na2O, K2O, and Cs2O are colorless, paleyellow, and orange, respectively. Author: Surhone, Lambert M./ Timpledon, Miriam T./ Marseken, Susan F. Binding Type: Paperback Number of Pages: 80 Publication Date: 2010/07/27 Language: English Dimensions: 6.00 x 9.00 x 0.19 inches

Acidic Oxide $71.7 High Quality Content by WIKIPEDIA articles An acidic oxide is an oxide that either: reacts with water to form an acid; or reacts with a base to form a salt. Examples include: Carbon dioxide which reacts with water to produce carbonic acid. Sulfur dioxide, which does not form the nonexistent sulfurous acid but does react with bases to form sulfites. Silicon dioxide, which does not react with water but will react with bases to form silicates. Chromium trioxide, which reacts with water to form chromic acid. Chromic acid is a hypothetical acid. The monomer and dimer would respectively have structures similar to sulfuric and disulfuric acids. Acidic oxides are oxides of either nonmetals or of metals in high oxidation states Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 100 Publication Date: 2010/11/24 Language: English Dimensions: 9.02 x 5.98 x 0.24 inches

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Triphenylphosphine Oxide $70.1 High Quality Content by WIKIPEDIA articles Triphenylphosphine oxide (often abbreviated TPPO) is the chemical compound with the formula OP(C6H5)3. Often chemists abbreviate the formula by writing Ph3PO or PPh3O (Ph = C6H5). This white crystalline compound is a common side product in reactions involving triphenylphosphine. It is a popular reagent to induce the crystallizing of chemical compounds. An alternative IUPAC name is (diphenylphosphoryl)benzene. Author: Surhone, Lambert M./ Timpledon, Miriam T./ Marseken, Susan F. Binding Type: Paperback Number of Pages: 92 Publication Date: 2010/07/26 Language: English Dimensions: 6.00 x 9.02 x 0.22 inches

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X3-Type MOV:The Safest / Most Reliable Surge Protector!!

Are you looking Surge Protectors ?

Worldofcables (California):

Why Do I Need One?

Power surges are basically an increase in the current flowing to your wall. These surges can occur for a number of reasons.

The most familiar reason is lightning. If lighting strikes near a power line above or below the ground, this causes an increase in the electrical pressure headed for your house. This creates an enormous surge that can destroy electronic devices, start a fire in the house or even electrocute someone using an appliance.

Though these types of surges are probably what someone thinks of first when one mentions surges, they are not only very uncommon, but they would also overwhelm almost any surge protector along with the appliances that are connected to it. Never rely on a surge protector in a thunderstorm. Unplug your devices for absolute safety.

Much more common, and perhaps a bit underestimated, are more subtle, daily surges. When refrigerators, heaters, air conditioners, and other power-hungry appliances kick on there is a sudden, brief demand for more power. Anyone who's ever seen the lights flickers when one of the appliances kicks on knows what I'm talking about. These small power disruptions can, immediately or over time, wreak havoc on the sensitive components found in equipment such as computers and home theater equipment. This scenario is perfect for surge protectors.

How Do They Work?

The most common surge protections used in the surge protectors are called metal oxide varistor or MOV. A MOV is made of a special metal called a semiconductor. Semiconductors only conduct electricity under certain special conditions. If these conditions are not present, no electricity can pass through the semiconductor. In a MOV, the special condition is a certain high level of voltage. Basically, if the voltage, or flow of electricity, is at a normal level, the MOV does nothing. When a surge of power travels through the line, the MOV is then able to conduct electricity and so it siphons off the excessive power, transferring it away from the device, safely into the ground. The MOV only siphons off the amount of power that's ABOVE the normal level, so the TV or PC continue to run during this surge. The device connected to the surge protector actually has no idea that there was a surge in the line. It continues to operate as if nothing happened.

Now, the inherent problem with MOVs is that, with all the small surges happening all the time, they can wear out. Most surge protectors contain more than one MOV, but if the MOVs burn out, that means all surges will have nowhere to go but straight to the devices connected to the protector. This is why it is important to choose a protector with some type of indicator letting you know when MOV protection has failed, so you know to stop using the protector. These indicators can be an LED light or an audible buzzer.

Additional Protection:

Some surge protectors also offer fuses as a backup. These fuses can only handle a certain level of voltage. When the voltage rises above that level, the fuse actually melts, immediately stopping all current from flowing to the connected devices. These are great as a backup, if your MOVs burn out and you don't know it. If the MOVs aren't there to stop the surge, than the fuse will melt and take care of the job.

With modern home theaters and complex computer systems becoming more and more common, surge protection is no longer just about power cords. Telephone lines as well as cable TV lines can carry large surges as well, potentially damaging expensive equipment. Many surge protectors can be found that include connections for phone, internet, or cable lines. These typically contain fuses, much like the backup fuses discussed above. Again, if the voltage spikes too high, the fuse melts and saves the devices attached to the protector.

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