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Re: AC Voltage

 

Yes, like I wrote earlier, that is a MOV - Metal Oxide Varistor and they have either two or three leads. The ones with three leads can be used to indicate when the MOV has blown. The ones with two leads are a crapshoot if they are still good, depends how they failed.

Most surge suppressors use MOVs. The biggest problem with MOVs is that the clamping voltage is really high. A MOV with an AC working voltage of 130VAC has a clamping voltage of over 350V, so you can still blow the electronics out.



On Fri, May 17, 2024 at 2:21?PM davesmith1800 via <davesmith1=[email protected]> wrote:
Found the name varistor.
I was little I hope mini lathe has one or just power strip in is easier to replace.



A varistor (a.k.a. voltage-dependent resistor (VDR)) is a surge protecting electronic component with an electrical resistance that varies with the applied voltage.[2] It has a nonlinear, non-ohmic current¨Cvoltage characteristic that is similar to that of a diode. Unlike a diode however, it has the same characteristic for both directions of traversing current. Traditionally, varistors were indeed constructed by connecting two rectifiers, such as the copper-oxide or germanium-oxide rectifier in antiparallel configuration. At low voltage the varistor has a high electrical resistance which decreases as the voltage is raised. Modern varistors are primarily based on sintered ceramic metal-oxide materials which exhibit directional behavior only on a microscopic scale. This type is commonly known as the metal-oxide varistor (MOV).
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Metal-oxide varistor manufactured by Siemens & Halske AG.


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Buffalo John
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