For the 275 Vac varistor on an air conditioner board built in Indonesia, Walsin Technology (Walsin) offers its 14 mm disc in two strengths, 4,500 A or 8,000 A, and a 10 mm Super High Energy disc at 4,000 A that can free board space. Venatech, Walsin’s authorised distributor in Hong Kong, crosses your MOV to them free.
Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this for an appliance engineer or buyer in Cikarang who is choosing the metal oxide varistor (MOV) across the mains input of an inverter air conditioner, refrigerator or washing machine. We parsed Walsin’s varistor export, Walsin_MOV_ALL.xlsx (379 rows, 379 distinct part numbers), reading the Series, Size, Max Working Volt., Varistor Voltage and Peak Current columns, and checked our stock list as at 23 September 2026. We re-measured every count on 11 November 2026.
What happened at Midea’s air conditioner factory in Cikarang?
A government visit and a 3 million unit milestone. According to Midea’s Indonesian newsroom on 9 September 2026, Indonesia’s Deputy Minister of Industry, Faisol Riza, attended the inauguration of Midea Electronics Indonesia’s factory and a 3 million unit production milestone at its residential air conditioner plant in Cikarang.
The same page says the Cikarang site covers more than 50,000 square metres, with the building area expanding from about 13,000 to 43,000 square metres, and that about 2 million units have been exported to ASEAN and North America as of 2026. It cites the government’s SNI and domestic component level (TKDN) requirements and says Midea commits to using more domestic suppliers. Those are Midea’s figures, not ours. Our point is narrower: every inverter appliance has a mains input, and every mains input needs surge protection. We have no relationship with Midea and say nothing about what it buys.
Why does a 275 Vac varistor sit on an appliance mains input?
Because it clamps line surges before they reach the rectifier. A 275 Vac MOV has a varistor voltage of 430 V in Walsin’s export, high enough to stay idle on a 230 Vac-class line with headroom and low enough to clamp a lightning or switching surge.
Two numbers decide the part. The maximum working voltage must sit above your highest steady line voltage, including your tolerance and any brown-out recovery. The peak current, the surge the disc survives once at an 8/20 microsecond test pulse, must cover your surge test level with margin. Disc diameter drives peak current, and the series decides how much current each square millimetre carries. Our guide on how to choose an MOV varistor works through the steps; check your own line tolerance and test level against your standard.
Which Walsin varistors cross a 275 Vac brief?
Seventeen, across four series. We filtered Walsin_MOV_ALL.xlsx to a 275 Vac maximum working voltage and found 17 part numbers, all at 430 V varistor voltage, in Standard D, High Energy E, Super High Energy V and Industrial series, from 5 mm to 53 mm and 400 A to 80,000 A.
The table shows the parts an appliance board is most likely to use, against a brief of 275 Vac and at least 4,000 A in a disc of 14 mm or less. Your incumbent goes in the last column.
| Walsin part | Series | Disc size | Varistor voltage | Peak current | Match / mismatch with the brief | Your incumbent |
|---|---|---|---|---|---|---|
SR431K14E |
Super High Energy (V) | 14 mm | 430 V | 8,000 A | Match, highest current at 14 mm | |
SR431K14D |
Standard (D) | 14 mm | 430 V | 4,500 A | Match | |
SR431K10E |
Super High Energy (V) | 10 mm | 430 V | 4,000 A | Match, smallest disc in the brief | |
SR431K10D |
Standard (D) | 10 mm | 430 V | 2,500 A | Mismatch: peak current below the brief | |
SR431K07E |
High Energy (E) | 7 mm | 430 V | 1,750 A | Mismatch: peak current below the brief | |
SR431K18E |
High Energy (E) | 18 mm | 430 V | 9,000 A | Mismatch: disc larger than 14 mm | |
SR431K20E |
Super High Energy (V) | 20 mm | 430 V | 13,000 A | Mismatch: disc larger than 14 mm |
In Walsin’s part numbers both the E and V series end in E, so confirm the series in the table before you order. A match is a match on export fields only.
Can a smaller Walsin disc replace a 14 mm standard varistor?
On peak current, nearly. In our count, the 10 mm Super High Energy SR431K10E is rated 4,000 A, which is 89 percent of the 4,500 A of the 14 mm Standard SR431K14D, while the 14 mm Super High Energy SR431K14E reaches 8,000 A, 1.8 times the Standard part.
That gives an appliance designer two honest options. Keep the 14 mm footprint and nearly double the surge margin with the V series, or shrink to 10 mm and give up about a ninth of the peak current. Energy rating, clamping voltage and lifetime under repeated surges are not in the export, so take them from Walsin’s datasheet before you decide. Our page on MOV series selection: D, E, V and Industrial compares the families.
What should a Cikarang appliance team check beyond the export?
The datasheet and the safety approvals. The 379-row export carries 10 columns, and none of them gives energy in joules, clamping voltage, lead form or safety certification, so take all four from Walsin’s own datasheet for the exact part number.
Thermal protection matters too: a varistor that ages under repeated surges can overheat, so many appliance designs pair it with a fuse or a thermally protected type. Your SNI and TKDN obligations are a compliance question, not a component one; confirm them with your compliance team. We request the varistor datasheet from Walsin on your behalf for any part you shortlist.
How do you get Walsin varistors through Venatech?
Request a quote. All 379 Walsin varistor part numbers, including the 17 at 275 Vac, are available to quote through Venatech; for this line, request a quote and we source it through our authorised Walsin channel rather than from the 23 September 2026 Hong Kong snapshot.
Varistors ship in bulk or on tape depending on lead form, so tell us your insertion method when you ask. The ready-stock list is a dated snapshot of what we hold in Hong Kong and is never live-synced. The varistor range lists the Walsin families. We give no lead time or stock promise.
How Venatech helps: what should an appliance buyer in Indonesia send us?
Your MOV part numbers, any maker. Venatech is Walsin’s authorised distributor in Hong Kong, and VenaMatch decodes 18 manufacturers’ part numbers and crosses 800,000+ parts to Walsin, with every field marked match or mismatch.
Paste up to 500 part numbers into the free cross-reference tool, or upload a full appliance BOM and request a quote for small lots. Worked example from our own export: a 275 Vac, 4,000 A, 14 mm or smaller brief returned 3 matches in 2 series. We hold no office in Indonesia and give no legal or customs advice. Walsin is the line we are authorised for; Stackpole and Viking are lines we supply.
The short version
For an air conditioner or appliance board built in Cikarang, Indonesia, Walsin covers the 275 Vac varistor position across 17 parts and four series, and its 14 mm disc comes at 4,500 A or 8,000 A. Venatech, Walsin’s authorised distributor in Hong Kong, crosses your MOV and quotes through its authorised channel.
Send us your mains-input varistor lines with your surge test level, and we will return the Walsin crosses with every difference stated. Which disc size is on your board today?
Related reading
- How to choose an MOV varistor
- MOV series selection: D, E, V and Industrial
- Anti-surge chip resistors
- Free cross-reference tool and ready-stock snapshot
Last reviewed 11 Nov 2026.
Sources
Fetched 11 November 2026.
- Midea Indonesia newsroom, government visit to the Cikarang residential air conditioner factory, 9 September 2026: https://www.midea.com/id-en/news/2026/government-visit-rac-factory
Frequently asked questions
What did Midea announce in Cikarang, Indonesia?
Midea’s Indonesian newsroom reported on 9 September 2026 that the Deputy Minister of Industry attended the inauguration of Midea Electronics Indonesia’s factory and a 3 million unit milestone at its Cikarang residential air conditioner plant. These are Midea’s figures, not ours.
Which Walsin varistor is rated 275 Vac?
We counted 17 Walsin part numbers at 275 Vac maximum working voltage, all with a 430 V varistor voltage, in 5 mm to 53 mm discs across the D, E, V and Industrial series, for example SR431K14D and SR431K14E.
What is the difference between SR431K14D and SR431K14E?
Both are 14 mm, 430 V, 275 Vac parts in Walsin’s export. SR431K14D is Standard series at 4,500 A peak current; SR431K14E is Super High Energy V series at 8,000 A. Check energy and clamping voltage in the datasheet.
Can I use a 10 mm varistor instead of 14 mm?
Walsin’s 10 mm SR431K10E is rated 4,000 A against 4,500 A for the 14 mm SR431K14D. Whether that margin is enough depends on your surge test level and energy rating; confirm against the datasheet and test it.
Does Venatech stock Walsin varistors in Hong Kong?
Varistors are quoted to order: request a quote and we source them through our authorised Walsin channel. We give no lead time or stock promise.
Is Venatech an authorised Walsin distributor?
Yes. Venatech Limited is Walsin’s authorised distributor in Hong Kong and serves Indonesia from Hong Kong.