Protective Component products
D12 refers to the nominal twelve millimetre disc diameter. It suits boards where a larger disc will not fit, at the cost of energy handling. Confirm the varistor voltage against worst-case line conditions and check the clamping figure at your real surge current.
Part number search & selector
The table uses the current English-site product records, published selection fields and part-specific technical-file links.
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Tolerance Voltage (DC.V)
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Clamping Voltage/V
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Rated Power/W
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Package
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Operating Temperature
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Broaden the selected filters or clear the current search.
By disc size
Disc diameter broadly tracks energy handling, but the datasheet figures decide.
How to select
Selection steps, parameter explanations and the series comparison for Metal Oxide Varistors (MOV) are on one page. Confirm the series there, then use this list for part numbers, files and samples.
Documents
Datasheets carry the voltage window, clamping figures and surge waveform conditions.
Showing representative available file sets. Search to find a specific SKU.
VOOHU’s published product content is reviewed by its engineering team. Specifications, downloads and technical support information are tied to specific part numbers, so you can verify them before requesting samples or a quotation.
FAQ
Answers cover how a varistor works, ageing, failure modes and coordination.
The nominal disc diameter of the ceramic body, about twelve millimetres. It is a mechanical classification used to filter by size and footprint. The actual dimensions, lead spacing and recommended mounting come from the datasheet for the specific part, not from the size code alone.
Less than a larger disc of the same voltage class, because absorption scales with the volume of ceramic available to take the heat. How much less depends on the specific part, so compare the rated surge current and energy figures at the same waveform rather than inferring from diameter.
When the surge class the installation must meet exceeds what a D12 part is rated for, or when the derating curve shows the part will not survive the expected number of events over its service life. Check the board has room for the larger disc and lead spacing before changing.
Clamping voltage depends mainly on the voltage class rather than the diameter, so two parts of the same class clamp at broadly similar levels. What changes with size is how much energy the part can take before it degrades. Compare the clamping figure at your actual surge current.
With a complete part number, send the part number, quantity, delivery region and the date you need it. If you are still selecting, send the line voltage and type, the surge standard you must meet and the available board space, and a sales engineer will confirm candidates.
Engineer support
Send the candidate part number and the condition you need reviewed. Sample support can be added after the selection is clear; commercial questions may be discussed in the same engineering conversation.
Include the document revision
Temperature, isolation voltage and PoE current basis
Pin count, pitch and spacing between pin rows
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When you need candidates and a comparison of differences
Engineering review identifies candidate parts and explains the differences.
From the selector or engineering review
Prototyping / pilot build / production
Specify sample and production timing separately
Compliance documents, material declarations or third-party reports
Samples are free of charge. Sample quantity and lead time depend on the part number and project stage. Sales will respond on business days.
