Solar inverter surge protection for Saudi Arabia starts with a unit trap: the Walsin Technology (Walsin) export prints the working voltage of all 379 varistors in AC only, never DC, and its highest varistor voltage is 1,181 volts DC, so nothing in it reaches 1,500 volts. None of the 379 is on our Hong Kong shelf.
Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this from the Walsin MOV (varistor) export (379 rows, 379 distinct part numbers) and our stock list as at 23 September 2026. It is for a design or sourcing engineer at a Saudi solar developer, inverter integrator or protection-panel builder who is choosing a disc varistor. Every part number is real and every count is ours. The market statement names its source and the day we fetched it, 10 November 2026.
What did Elsewedy report about its 348.6 MW solar plant near Riyadh?
It reported a handover, and a faster build. According to Mubasher (9 March 2026), Elsewedy Electric for Transmission and Distribution announced the completion and handover of a solar plant with a peak generation capacity of 348.6 MW, about 85 km east of Riyadh, built in 16.5 months against an original 24-month timeline.
The article says the project was developed with Jinko Power and Al Ghazala Energy Company, that the Saudi Power Procurement Company is the ultimate off-taker, and that the plant has entered operations and maintenance. It names no inverter supplier and does not mention battery storage. Those are the publisher’s figures, not ours. We have no relationship with Elsewedy, Jinko Power, Al Ghazala or the off-taker, and we say nothing about what any of them buys. Our view, labelled as ours: a plant of that size carries surge protection on both the AC and DC sides, and the part number on a protection panel is a small line on a large bill of materials.
What does the Walsin varistor export actually print for working voltage?
An AC value, on every row. We parsed all 379 part numbers in the Walsin MOV export, in four series (170 Standard D, 101 Industrial, 60 Super High Energy V and 48 High Energy E), and every Max Working Volt. entry is in Vac, 379 of 379, across 35 distinct values from 11 to 750 Vac; the DC figure is the Varistor Voltage column, and it peaks at 1,181 Vdc.
Of the 379, 27 have a varistor voltage of 1,000 Vdc or more and none reaches 1,500 Vdc. Peak current is printed in amperes on all 379 rows with no waveform stated, and 82 parts are rated 460 Vac or higher, of which 46 carry 10 kA or more. A second trap sits in the part number: a trailing E appears on 108 parts, 60 in the Super High Energy V series and 48 in the High Energy E series, so the last letter does not name the series. We have not seen this counted anywhere. Our post on how to choose an MOV varistor gives the method, and the MOV range lists the families.
Which Walsin varistors cross a 625 Vac, 10 kA brief, and what differs?
Two match on every field, and a third family differs by letter only. We filtered the export for 625 Vac and found 13 part numbers, all with a 1,000 Vdc varistor voltage; 7 carry 10 kA or more, and only SR102K25D and SR102K20E do so in a disc of 25 mm or less.
The reader’s incumbent goes in the last column.
| Walsin part | Series, size | Working, varistor voltage, peak current | On shelf 23 Sep 2026 | Match / mismatch against 625 Vac, 1,000 Vdc, 10 kA or more, plus or minus 10%, disc up to 25 mm | Your incumbent |
|---|---|---|---|---|---|
SR102K25D |
Standard D, 25 mm | 625 Vac, 1,000 Vdc, 18,000 A | No | Match on every export field | |
SR102K20E |
Super High Energy V, 20 mm | 625 Vac, 1,000 Vdc, 13,000 A | No | Match on every export field | |
SR102K14E |
Super High Energy V, 14 mm | 625 Vac, 1,000 Vdc, 8,000 A | No | Match on voltages; mismatch: peak current is 8,000 A | |
SR102K32D |
Industrial, 32 mm | 625 Vac, 1,000 Vdc, 30,000 A | No | Match on voltages and current; mismatch: 32 mm disc is larger than 25 mm | |
SR112K10D |
Standard D, 10 mm | 680 Vac, 1,068.5 Vdc, 2,500 A | No | Mismatch: 680 Vac class and 2,500 A |
A match in the table is a match on the export fields, no more. Confirm against both datasheets and qualify in your own circuit. Our post on MOV varistor series selection: D, E, V and Industrial explains the series split.
What does the Hong Kong shelf hold in varistors?
None. Our stock list as at 23 September 2026 holds 1,125 distinct part numbers, and we matched all 379 varistor part numbers against it: 0 are on the shelf, so every part in this post is a factory order requested through the site.
The ready stock list is a dated snapshot, never live-synced, and we quote part-number counts, never piece counts. Plan a varistor line as a lead-time conversation with us, not as a shelf pick.
What will we not tell you about solar plants?
Anything about a plant, an inverter or a grid code. We hold 28 Walsin datasheets, 451 pages, and none covers a varistor, so we cannot give you a DC working voltage, an energy rating in joules or a surge waveform for any of the 379 parts.
We make no claim that any part suits a string inverter, a combiner box or a Saudi grid requirement, or that a 625 Vac class is the right one for any plant. We hold no ISO 9001 or IATF 16949 certificate. We hold no office, entity or stock in Saudi Arabia; our locations are Hong Kong, Shenzhen, Singapore and Jiangmen, with Chengdu in preparation. We give no legal, customs or conformity advice, including on local-content rules; confirm with your compliance team. Qualification stays with you.
How can Venatech help a Riyadh solar buyer?
By stating the gap between a catalogue value and a rating. Venatech Limited is an authorised Walsin distributor in Hong Kong, and our VenaMatch tool decodes 18 manufacturers’ part numbers and covers 800,000+ crossable parts, with each candidate’s differences stated.
- Cross-reference. Paste your incumbent varistor into the free cross-reference tool, up to 500 part numbers or an Excel or CSV file, and read the Walsin candidates field by field.
- BOM check. Upload the protection-panel BOM to /bom/ and request a quote.
- Ready stock. The ready-stock list is a Hong Kong snapshot dated 23 September 2026, not live.
- Service. Hong Kong-based, small lots welcome. Walsin is the only line we are authorised for; Stackpole and Viking are lines we supply.
Worked example from our own export: a 625 Vac, 1,000 Vdc, 10 kA brief in a disc of 25 mm or less maps to 2 exact parts among 13 at the voltage, none on the shelf. Qualification stays with you.
The short version
For a Saudi solar buyer, the Walsin varistor export prints working voltage in AC only on all 379 parts, tops out at 1,181 volts DC varistor voltage, has 13 parts at 625 Vac of which 2 reach 10 kA in a disc of 25 mm or less, and has none on the Hong Kong shelf.
Send us one varistor from a solar protection panel, with the AC class, peak current and disc size you can accept, and we will return the Walsin parts with every difference stated. If your DC bus needs a continuous DC rating, do you have the datasheet figure in hand?
Sources
Fetched 10 November 2026.
- Mubasher, Elsewedy Electric delivers a solar power plant in Riyadh, 9 March 2026: https://english.mubasher.info/news/4564269/Elsewedy-Electric-delivers-Saad-Solar-Power-Plant-in-Riyadh-project-sets-a-new-regional-benchmark/
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 (VenaMatch)
- Ready stock, Hong Kong snapshot dated 23 September 2026
Last reviewed 10 Nov 2026.
Frequently asked questions
What did Elsewedy report about a solar plant near Riyadh?
Mubasher reported on 9 March 2026 that Elsewedy Electric for Transmission and Distribution handed over a 348.6 MW solar plant about 85 km east of Riyadh, built in 16.5 months against 24 planned. It names no inverter supplier. These are the publisher’s figures, not ours.
How many varistors are in the Walsin MOV export?
We counted 379 distinct part numbers in four series: 170 Standard D, 101 Industrial, 60 Super High Energy V and 48 High Energy E. None is on the Hong Kong shelf as at 23 September 2026.
Does the Walsin export give a DC working voltage for its varistors?
No. All 379 Max Working Volt. entries are in Vac. The Varistor Voltage column is in Vdc and peaks at 1,181 Vdc, with 27 parts at 1,000 Vdc or more and none at 1,500 Vdc. Check the datasheet for any DC rating.
Which Walsin varistors match a 625 Vac, 10 kA brief in a 25 mm disc?
SR102K25D at 18,000 A and SR102K20E at 13,000 A match on every export field. Of 13 parts at 625 Vac, 7 carry 10 kA or more, but 5 of those are larger than 25 mm. Qualify in your own circuit.
Does the last letter of a Walsin varistor part number name its series?
Not reliably. A trailing E appears on 108 parts: 60 in the Super High Energy V series and 48 in the High Energy E series. Read the series name in the export or datasheet, not the last letter of the code.
Do you hold stock or an office in Saudi Arabia?
No. We hold no office, entity or stock in Saudi Arabia; 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.