230 Vac Mains Input Parts for Portugal: Walsin’s Varistor and Y Capacitor Lines Share Zero of 39 AC Ratings

A 230 Vac mains input stage needs a varistor and a Y capacitor, and the two Walsin lines that supply them never state the same AC number. We counted both: 35 maximum working voltages across 379 varistors, 4 X1 ratings across 367 safety discs, and zero overlap. You cannot pair them on a voltage.

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Venatech Limited, an authorised Walsin distributor in Hong Kong, holds Walsin Technology (Walsin) varistor export of 379 rows and disc capacitor export of 929 rows, and no datasheet for either line — none of our 28 Walsin datasheets covers a varistor or a disc capacitor. This post is written from those two export files and nothing else. Every part number below is real and every count is a count of part numbers, never pieces. Portuguese appliance and industrial manufacture is the reader: a 230 Vac input stage, built for a market whose supply is nominally the same as the rest of continental Europe.

Does Venatech hold stock or an entity in Portugal?

No. The operating entities are Venatech Limited in Hong Kong, the Shenzhen trading entity, VENATECH PTE LTD in Singapore and the Jiangmen factory in Guangdong, with Chengdu in preparation. Hong Kong is the authorised Walsin distribution entity and the origin for any Portuguese ship-to. There is no Portuguese office, no Portuguese warehouse and no local inventory.

We say it before anything else because it changes which questions are worth asking us. On the 23 September 2026 ready stock snapshot, zero of the 379 varistor part numbers and zero of the 929 disc capacitor part numbers appeared — both lines are an order, not a pull, and we would rather you heard that from us than found it at the quote stage.

What does a 230 Vac Portuguese mains input stage need from these two lines?

Two devices, in two places, and the catalogue treats them nothing alike. The varistor sits line to neutral and is picked on maximum continuous working voltage, normally 275 Vac or 300 Vac for a 230 Vac supply. The Y capacitor sits across the isolation barrier and is picked on safety class.

Position in the stage	Walsin line	Export rows	What selects it	Match / mismatch on documentation
Line to neutral, surge clamp	Metal oxide varistor	379	Working voltage, then footprint and peak current	Mismatch — 0 of 28 datasheets cover it
Across the isolation barrier	Safety certificated disc	929, of which 367 safety	X1 and Y class, then capacitance	Mismatch — 0 of 28 datasheets cover it
Hong Kong stock, 23 September 2026	Both lines	0 part numbers	—	Mismatch — zero representation for both

The varistor side of the shelf is generous. We measured all four candidate steps — 230, 250, 275 and 300 Vac — and each publishes exactly 17 part numbers across all 11 footprints with 16 distinct peak currents, from 400 A on a 5 mm disc to 80,000 A on a 34 mm square Industrial part. Four steps, identical shape, 68 part numbers.

Part number	Series	Size	Max working voltage	Peak current	Match / mismatch vs a disc safety AC rating
SR431K05D	Standard (D Series)	5 mm	275 Vac	400 A	Mismatch — 275 Vac is not an X1 rating in the disc file
SR431K14D	Standard (D Series)	14 mm	275 Vac	4,500 A	Mismatch — same voltage, no disc counterpart
SR431K53D	Industrial	53 mm	275 Vac	70,000 A	Mismatch — same voltage, no disc counterpart
SR361K14D	Standard (D Series)	14 mm	230 Vac	4,500 A	Mismatch — 230 Vac is not an X1 rating either

Do the varistor and the Y capacitor lines ever share an AC voltage rating?

Not once on the rating that matters. We extracted every distinct AC voltage from both files. The varistor export holds 35 maximum working voltages, from 11 Vac to 750 Vac. The 367 safety certificated disc rows hold 4 X1 ratings: 400, 440, 500 and 760 Vac. The intersection is empty. Thirty-nine distinct AC numbers across the two lines, and not one appears in both.

Line and field	Distinct AC values	The values	Match / mismatch across the two lines
Varistor Max Working Volt., 379 rows	35	11 to 750 Vac, including 230, 275, 300, 360, 420	Mismatch — none of the 35 is an X1 rating
Disc X1 part of UR, 367 rows	4	400, 440, 500, 760 Vac	Mismatch — none is a varistor working voltage
Disc Y part of UR, 367 rows	3	250, 300, 500 Vac	Partial match — 250 and 300 Vac are also varistor steps

We have not seen this counted anywhere. The only two AC numbers the two files share are 250 and 300, and they appear on the disc side as Y-class voltages across the isolation barrier, not as the X1 line rating. They describe a different voltage in a different place in the circuit. A sourcing filter that pairs a varistor and a Y capacitor by matching AC rating will either return nothing or return the wrong thing.

There is no defect here and we are not claiming one. The two devices are rated on different bases, which is exactly why the pairing cannot be automated off a voltage column.

Which Y class can a 230 Vac input actually choose?

It is not a free choice, and we re-measured this for Portugal rather than quote it. All four X1 ratings clear 230 Vac comfortably, so the voltage does not narrow the field — but the Y class is decided by the X1 rating you pick, and three of the four ratings offer only one class.

X1 rating	Y class	Parts	Y voltages published	Match / mismatch vs a free Y1/Y2 choice
400 Vac	Y1 only	112	Y1 250 Vac and Y1 400 Vac	Mismatch — no Y2 part at 400 Vac
440 Vac	Y2 only	137	Y2 250 Vac and Y2 300 Vac	Mismatch — no Y1 part at 440 Vac
500 Vac	Y1 and Y2	103	Y1 500 Vac on 54, Y2 500 Vac on 49	Match — the only rating offering both
760 Vac	Y1 only	15	Y1 500 Vac	Mismatch — no Y2 part, smallest shelf in the range

112 plus 137 plus 103 plus 15 is 367, the whole safety range. This is a finding we published earlier and it reproduced exactly on re-measurement: the X1 rating decides the Y class on 264 of the 367 safety parts. Only the 500 Vac rating lets a designer change Y class without changing the X1 rating. The class decode is in X1/Y1 versus X1/Y2 safety capacitors.

Part number	Series	Capacitance	X1 rating	Y class	Match / mismatch vs YP0AC102K080
YP0AC102K080	X1/Y2 AC series	1000 pF	440 Vac	Y2 250 Vac	Match on all fields — this is the reference row
YP0AH102K100	X1/Y1 AH series	1000 pF	400 Vac	Y1 250 Vac	Mismatch — same capacitance and Y voltage, different X1 and different Y class
YP5AC102K080	X1/Y2 AC series, 500 V	1000 pF	500 Vac	Y2 500 Vac	Mismatch — same class and capacitance, higher X1 and Y voltage
YP0AS102K110	X1/Y1 AS series	1000 pF	760 Vac	Y1 500 Vac	Mismatch — highest X1 rating, Y1 only, larger body code
YU0AC222M080	X1/Y2 AC series	2200 pF	440 Vac	Y2 250 Vac	Mismatch — 2.2x the capacitance, Y5U dielectric, ±20%

Five part numbers, five different answers at the same position in the circuit, and only one field separates some of them.

How many capacitance and X1 class pairings exist at all?

118 of 144, and we counted every cell. The 367 safety rows publish 36 distinct capacitance values from 10 pF to 10,000 pF across the 4 X1 ratings, which is a grid of 144 possible pairings. 118 of those 144 cells hold at least one part number. 26 are empty.

The emptiness is not spread about. Only 13 of the 36 capacitance values exist at all four X1 ratings — 100, 150, 220, 330, 470, 560, 680, 1000, 1500, 2200, 3300, 3900 and 4700 pF. The other 23 do not.

Capacitance value	400 Vac X1	440 Vac X1	500 Vac X1	760 Vac X1	Match / mismatch across the four ratings
1000 pF	10 parts	13 parts	9 parts	3 parts	Match — at all four, the widest value in the range
4700 pF	6	8	5	1	Match — at all four
10 pF to 82 pF (20 values)	2 each	2 each	2 each	0	Mismatch — the low-picofarad shelf stops before 760 Vac
820 pF	0	5	1	0	Mismatch — two X1 ratings only
6800 pF	0	3	1	0	Mismatch — two X1 ratings only
10,000 pF	0	3	1	0	Mismatch — two X1 ratings only

We have not seen this grid counted anywhere. Two consequences. The 760 Vac shelf is 15 part numbers carrying 13 capacitance values, and all 20 values below 100 pF are missing from it, so a high-X1 part at low capacitance does not exist here. And 820 pF, 6800 pF and 10,000 pF exist only at 440 Vac and 500 Vac, so choosing one of those three values has already chosen your X1 rating and therefore your Y class.

The varistor side has the same shape of problem elsewhere in its range, counted in the MOV voltage ladder. The full line is on the Walsin ceramic disc capacitor page.

What should a Portuguese appliance or industrial manufacturer do next?

Pick the two devices separately and in the right order, because the catalogue will not pair them for you. Choose the Y capacitor’s X1 rating first, since that decides the Y class and constrains the capacitance. Choose the varistor’s working voltage second, against the supply and not against the capacitor.

1. Fix the X1 rating before the capacitance. 400 Vac and 760 Vac give Y1 only, 440 Vac gives Y2 only, and only 500 Vac offers both. 820 pF, 6800 pF and 10,000 pF narrow you to 440 or 500 Vac on their own.
2. Cross the whole input stage in one pass. Paste up to 500 part numbers or drop your Excel or CSV into the free cross reference tool, filter for safety certified parts, and read every stated difference rather than a claimed match. We will not tell you a part is equivalent. We will show you where it differs.
3. Check what was physically in Hong Kong on ready stock — a dated snapshot as at 23 September 2026, in which neither line appears at all.

The short version

A 230 Vac Portuguese mains input needs a varistor and a Y capacitor from two Walsin lines whose AC ratings never meet: 35 varistor working voltages, 4 disc X1 ratings, 39 distinct numbers, no overlap. The only shared numbers, 250 and 300 Vac, mean a Y-class voltage on one side and a line working voltage on the other. Each of the 230, 250, 275 and 300 Vac varistor steps publishes 17 part numbers across 11 footprints and 16 peak currents. The X1 rating decides the Y class on 264 of 367 safety parts, and the capacitance grid holds 118 of 144 cells, with every value below 100 pF absent at 760 Vac. We hold no datasheet for either line and neither appeared in the 23 September 2026 snapshot. Qualification stays with you.

Send us the input-stage lines off your Portuguese bill of materials — varistor and Y capacitor together — and we will come back with Walsin candidates field by field, including which specifications we would have to ask Walsin for on your behalf. We will tell you what we do not have. Nobody else will. And if your selection tool paired your varistor and your Y capacitor by matching an AC rating, which of the two numbers did it match?

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Frequently asked questions

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