For industrial control electronics in Czechia, the Walsin Technology (Walsin) varistor list holds 36 of 379 parts rated 40 Vac or less, the pool for a 24 V control rail. The export states only an AC working voltage, so a DC rail needs the datasheet. None of the 36 is on the Hong Kong shelf.
Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this for a design or sourcing engineer at a Czech maker of PLC modules, drives or control panels, Brno included, who has to place a surge clamp on a 24 V rail. We read the Walsin MOV export (379 rows, 379 distinct part numbers) and our stock list as at 23 September 2026. Every part number is real. The market facts name their source and the day we fetched it, 10 November 2026.
What did the Czech Statistical Office report for industry in August 2026?
New orders grew faster than output. According to the Czech Statistical Office release published on 7 October 2026, industrial production rose 2.6 percent year on year in real terms in August 2026, while new orders rose 5.9 percent, with non-domestic orders up 9.3 percent and domestic orders down 0.5 percent.
The same release says electrical equipment was among the main drivers of the order increase and that production of computer, electronic and optical products continued to grow, while employment in industry fell 1.0 percent. Those are the statistician’s numbers, not ours. For Brno specifically, a CIJ Europe report dated 3 May 2022 said ABB planned to double sensor output at its Brno site to as many as 100,000 units a year once a new line was completed in 2026. We found no 2026 update to that plan today, so treat it as a plan, not a result.
Which Walsin varistors cross a 10 mm, 30 Vac, 500 A brief, and what differs?
Five candidates sit around the brief, and one is a clean match. We filtered the 379 Walsin varistor rows to 10 mm discs at 25 to 35 Vac and found 3 parts; exactly 1, SR470K10D, matches a 10 mm, 30 Vac, 500 A peak current brief on every export field.
Put your incumbent in the last column.
| Walsin part | Description | On shelf 23 Sep 2026 | Match / mismatch with the brief | Your incumbent |
|---|---|---|---|---|
SR470K10D |
Standard D series, 10 mm, 30 Vac max working, 47 Vdc varistor voltage, plus or minus 10 percent, 500 A peak | No | Match on size, working voltage and peak current | |
SR390K10D |
Standard D series, 10 mm, 25 Vac, 39 Vdc, 500 A | No | Mismatch: working voltage is 25 Vac, lower | |
SR560K10D |
Standard D series, 10 mm, 35 Vac, 56 Vdc, 500 A | No | Mismatch: working voltage is 35 Vac, higher, with a higher clamp level | |
SR470K14D |
Standard D series, 14 mm, 30 Vac, 47 Vdc, 1000 A | No | Match on voltage; mismatch: 14 mm disc and 1000 A peak | |
SR470K07D |
Standard D series, 7 mm, 30 Vac, 47 Vdc, 250 A | No | Match on voltage; mismatch: 7 mm disc and 250 A peak |
A match here is a match on the export fields, no more. Confirm against both datasheets and qualify in your own circuit. Our guides to how to choose an MOV varistor and to MOV series selection cover the series split.
How many low-voltage varistors does each disc size offer?
Only five of eleven disc sizes go low. We counted the 379 rows by size: the 5, 7, 10 and 14 mm discs each offer 8 parts from 11 Vac to 40 Vac, the 20 mm disc offers 4 from 25 to 40 Vac, and the other six sizes start at 120 Vac or more.
That makes 36 low-voltage parts, all in the Standard D series, with peak current rising with the disc: 100 A at 5 mm, 250 A at 7 mm, 500 A at 10 mm, 1000 A at 14 mm and 2000 A at 20 mm. A cabinet that needs more than 2000 A at 24 V has no part in this list; the E, V and Industrial series all start at 130 Vac. The 18, 25, 32, 34 mm square, 40 and 53 mm discs have no part below 120 Vac. We have not seen this size-by-voltage floor counted in any distributor catalogue.
Why does an AC-only rating matter for a 24 V DC rail?
Because the export never gives a DC working voltage. We read all 379 rows: every Max Working Volt. cell ends in Vac, every Varistor Voltage cell ends in Vdc, and no column states a DC working limit, an energy rating or a clamping voltage at a stated current.
A 24 V DC control rail, with its supply tolerance and ripple, therefore cannot be matched to a row without a datasheet. We hold no Walsin varistor datasheet, so we cannot fill that gap for you. The Packing, SPQ and MOQ columns are empty on all 379 rows, and the tolerance reads plus or minus 10 percent on all 379, so tolerance does not discriminate between parts.
What does the Hong Kong shelf hold in varistors?
None. Of the 1,125 distinct part numbers on our stock list as at 23 September 2026, 0 are varistors: the list holds 732 MLCC, 132 specialty MLCC, 254 chip resistors, 3 safety capacitors, 2 inductors, 1 resistor array and 1 other.
So every varistor in this post is a to-order enquiry. The ready-stock list is a dated snapshot, never live-synced, and the MOV range lists the families. We give no lead time and no stock promise here.
What will we not tell you about Czech control cabinets?
Anything about your approvals, your supplier list or your design. Of the 379 varistors in the Walsin export, 379 have no datasheet in our files, so every count here is catalogue coverage, not suitability, and no claim is made that any part meets a machinery or EMC standard.
We hold no ISO 9001 or IATF 16949 certificate. We hold no office, entity or stock in Czechia; our locations are Hong Kong, Shenzhen, Singapore and Jiangmen, with Chengdu in preparation. We give no legal, customs or conformity advice; confirm with your compliance team. Qualification stays with you.
Why do buyers in Czechia choose Venatech?
Because we show the gap before you find it. Venatech Limited is an authorised Walsin distributor in Hong Kong, and the Walsin varistor export alone is 379 part numbers, 36 of them at 40 Vac or less and none with a stated DC working voltage.
A Czech buyer gets a Hong Kong team that welcomes small lots, answers cross-reference questions field by field, and says plainly when a row cannot be matched from the export. Our VenaMatch tool decodes 18 manufacturers’ part numbers and covers 800,000+ crossable parts, and every candidate comes back with each field marked match or mismatch.
How can Venatech help a Czech control-panel maker?
How Venatech helps starts with a free paste box. The cross-reference tool accepts up to 500 part numbers or an Excel or CSV file and shows Walsin candidates with each field marked match or mismatch. Load a whole BOM for a check. The ready-stock list is a Hong Kong snapshot dated 23 September 2026.
Worked example from our own export: a 10 mm, 30 Vac, 500 A brief returned 1 exact part among 5 candidates, none stocked. Walsin is the only line we are authorised for. We serve from Hong Kong in small lots, we help cross-reference, and you request a quote through the site.
The short version
For a Czech control-panel maker, a 24 V rail clamp is a datasheet question: 36 of 379 Walsin varistors are rated 40 Vac or less, the export gives no DC rating, and the shelf holds none. Name the disc size, the Vac rating and the peak current.
Send us one varistor line from your BOM, with the disc size, working voltage and peak current you can accept, and we will return the Walsin parts with every difference stated. If your incumbent prints only a Vdc varistor voltage, do you know its working voltage?
Related reading
- How to choose an MOV varistor
- MOV varistor series selection: D, E, V and Industrial
- Anti-surge chip resistors
- Free cross-reference tool and ready-stock snapshot
Last reviewed 10 Nov 2026.
Sources
Fetched 10 November 2026.
- Czech Statistical Office, Industry, August 2026, released 7 October 2026: https://csu.gov.cz/rychle-informace/industry-august-2026
- CIJ Europe, ABB in Brno will double its sensor production by 2026, 3 May 2022: https://cijeurope.com/en/abb-in-brno-will-double-its-sensor-production-by-2026/post.html
Frequently asked questions
What did the Czech Statistical Office report for August 2026?
Its 7 October 2026 release said industrial production rose 2.6 percent year on year in real terms, new orders rose 5.9 percent, non-domestic orders rose 9.3 percent, domestic orders fell 0.5 percent and industrial employment fell 1.0 percent. These are the statistician’s figures, not ours.
How many Walsin varistors are rated 40 Vac or less?
36 of 379 distinct part numbers, all in the Standard D series, across five disc sizes: 8 each at 5, 7, 10 and 14 mm, and 4 at 20 mm. The other six disc sizes start at 120 Vac or more.
Which Walsin varistor matches a 10 mm, 30 Vac, 500 A brief?
SR470K10D matches on size, 30 Vac working voltage and 500 A peak current in the export. Its neighbours differ in voltage, disc size or peak current. Confirm against the datasheet and qualify in your own circuit before design-in.
Does the Walsin export give a DC working voltage for a 24 V rail?
No. All 379 working-voltage cells are in Vac and all varistor-voltage cells are in Vdc, with no DC working limit or energy column. A 24 V DC rail needs the datasheet for the exact part number.
Are Walsin varistors on the Hong Kong shelf?
Not as at 23 September 2026: 0 of 1,125 distinct stocked part numbers are varistors. The snapshot is dated, not live, so ask us through the site for a to-order enquiry.
Do you hold stock or an office in Czechia?
No. We hold no office, entity or stock in Czechia; our locations are Hong Kong, Shenzhen, Singapore and Jiangmen. We hold no ISO 9001 or IATF 16949 certificate and give no legal, customs or conformity advice. Confirm with your compliance team.