275 VAC Varistor for Ireland’s Data Centre Power: 17 Walsin MOVs from 400 A to 80,000 A Peak, from Venatech, Walsin’s Authorised Distributor in Hong Kong

For a 275 VAC varistor in Ireland’s data centre power equipment, Walsin Technology (Walsin) lists 17 metal oxide varistors at 275 Vac, from 5 mm discs rated 400 A peak to 53 mm industrial parts rated 70,000 A and square blocks to 80,000 A. Venatech Limited, an authorised Walsin distributor in Hong Kong, crosses your current MOV to them.

Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this for engineers and buyers in Ireland who design or build the power supplies, PDUs, UPS units and switchgear electronics that feed data halls, where a varistor across the 230 V input is the first line of surge protection. We parsed Walsin’s varistor export, Walsin_MOV_ALL.xlsx (379 part numbers), and our ready-stock list as at 23 September 2026. Every count below we re-measured on 11 November 2026.

What share of Ireland’s electricity did data centres use in 2025?

Almost a quarter. The Central Statistics Office reported on 7 July 2026 that data centres used 23 percent of Ireland’s metered electricity in 2025, up from 5 percent in 2015, with consumption of 7,663 GWh against 6,973 GWh in 2024, a rise of 10 percent while all other customers rose 2 percent.

The CSO adds that data centres used more than all urban households, at 18 percent, and rural households, at 9 percent. Those are the CSO’s figures. The practical reading for an Irish electronics team: every new hall adds power conversion and distribution equipment, and every one of those boards carries surge protection on its mains input, usually a metal oxide varistor. A documented second source for that varistor is a small approval that protects a large build. We say nothing about any operator’s plans.

Which Walsin varistors are rated 275 Vac?

Seventeen, in four series. We counted 17 Walsin part numbers in Walsin_MOV_ALL.xlsx with a maximum working voltage of 275 Vac and a varistor voltage of 430 Vdc: 6 Standard (D series), 3 High Energy (E series), 3 Super High Energy (V series) and 5 Industrial.

The table shows 11 of the 17; the others are the 5 mm, 7 mm and 18 mm High Energy parts, the 10 mm Super High Energy part, and the 34 mm square and 40 mm Industrial parts at 40,000 A. Our varistor range lists every series, and our guide to MOV series selection: D, E, V and Industrial explains the energy classes.

Which Walsin MOV crosses a 14 mm, 275 Vac, 4,500 A line?

One exactly, one with more headroom. We filtered the 275 Vac rows for a 14 mm disc and found 2: SR431K14D matches a 4,500 A Standard part on every export field, and SR431K14E keeps the size and voltage with 8,000 A peak current.

We checked all four rows against the same 430 Vdc plus or minus 10 percent varistor-voltage field. The 14 mm disc is a common choice on a server power supply input; the step to the Super High Energy part is a drop-in on footprint where the lead spacing matches, which the datasheet confirms. None of these was on our Hong Kong shelf as at 23 September 2026; request a quote and we source them through our authorised Walsin channel.

When does a 300 Vac or 320 Vac varistor make sense on a 230 V supply?

When the supply runs high or swells. Walsin_MOV_ALL.xlsx lists 17 parts at 300 Vac (470 Vdc) and 17 at 320 Vac (510 Vdc), in the same sizes and series as the 275 Vac rows, so a designer can raise the working voltage without changing the package.

A higher working voltage reduces stress during sustained over-voltage but raises the clamping voltage the downstream parts must survive. That trade-off belongs to the design team and the applicable equipment standard. Our guide to the MOV voltage ladder shows where the steps fall. We give no legal, customs or certification advice; confirm with your compliance team.

What should an Irish engineer check before approving a Walsin varistor?

Energy, clamping and approvals. We match the export’s four fields, size, working voltage, varistor voltage and peak current, but the export lists no energy rating in joules and no maximum clamping voltage, and both decide whether a varistor survives a real surge.

Take energy, clamping voltage, lead spacing and safety approvals from Walsin’s datasheet for the exact part, and check the varistor against the thermal fuse or protection scheme on your board. Our guide to what a varistor datasheet tells you that the export does not lists the fields.

How does Venatech help an Irish buyer second-source varistors?

How Venatech helps starts with your part number. Venatech, Walsin’s authorised distributor in Hong Kong, runs VenaMatch, which decodes part numbers from 18 manufacturers and crosses 800,000+ parts to Walsin with every field marked match or mismatch.

Paste up to 500 lines into the cross-reference tool or load a full BOM. The ready-stock list is a Hong Kong snapshot dated 23 September 2026; for varistors not on it, request a quote and we source them through our authorised Walsin channel. We serve Ireland from Hong Kong in small lots with fast quotes, and give no stock or delivery promise. Walsin is the line we are authorised for; Stackpole and Viking are lines we supply.

The short version

The CSO puts data centres at 23 percent of Ireland’s metered electricity in 2025. For the surge protection on their power equipment, Walsin offers 17 varistors at 275 Vac, from 400 A to 80,000 A peak, and a 14 mm 275 Vac line crosses to SR431K14D or the higher-rated SR431K14E.

Send us your varistor lines and we will return the Walsin matches with every difference stated.

Related reading

• MOV series selection: D, E, V and Industrial
• The MOV voltage ladder: where the steps actually are
• What a varistor datasheet tells you that the export does not
• Free cross-reference tool and ready-stock snapshot

Last reviewed 11 Nov 2026.

Sources

Fetched 11 November 2026.

• Central Statistics Office, “Data Centres Metered Electricity Consumption 2025: Key Findings”, 7 July 2026: https://www.cso.ie/en/releasesandpublications/ep/p-dcmec/datacentresmeteredelectricityconsumption2025/keyfindings/

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