Norway’s grid operator Statnett paused new data centre connection reservations on 9 November 2026, citing fault ride-through and grid oscillations. For the power-supply engineer, an X1 Y2 safety capacitor choice is part of how a server load behaves on that grid. Walsin lists 186 Y2 disc parts; only 4 reach 10 nF.
Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this for a power-supply, rack-power or UPS engineer at a Norwegian data centre, integrator or power electronics maker. Walsin Technology (Walsin) is the only line we are authorised for. Every Walsin figure below comes from our own exports, which we re-measured on 11 November 2026: the disc capacitor export (929 rows, 929 distinct part numbers) and the MLCC export (24,026 rows, 23,601 distinct part numbers). Every part number is real and appears in Walsin’s export.
What did Statnett decide about data centres in Norway on 9 November 2026?
A pause on new grid reservations for data centres. Capacity reported on 9 November 2026 that Statnett, Norway’s grid operator, temporarily stopped new connection reservations for data centres, citing system security and the need to set requirements for fault ride-through, load changes and grid oscillations; the pause ends by 1 August 2027 at the latest.
The same Capacity report, which we read on 11 November 2026, gives Statnett’s figures: 800 MW of data centre load connected, 4,200 MW reserved, 9,100 MW in the queue and 18,000 MW in requests. Ministers also announced plans for a licensing regime, with main principles due by autumn 2027. Connected sites are unaffected. These are the reporter’s and Statnett’s figures, not ours, and we say nothing about any operator’s plans.
Why does a grid-connection rule reach the X1 Y2 safety capacitor on a power-supply board?
Because the input filter is the first thing the grid sees. Every server power supply has an EMI filter at its mains input, and Walsin’s safety discs carry an X1 rating for the across-the-line position and a Y1 or Y2 rating for line-to-earth; a data hall multiplies one board’s choice by thousands of supplies.
Our engineering reading, not Statnett’s: when the grid operator writes requirements for how a large load behaves during faults and fast load changes, the front end of each power supply becomes part of the conversation. Across-the-line capacitance draws a small leading current even when the server idles, and line-to-earth capacitance sets touch current. Neither number is set by us or by Walsin. Both are your design decisions, made against your own standards and your customer’s specification.
How many Walsin safety discs are Y2, and how far do they reach?
186 of 367. We counted 367 safety-certificated disc part numbers in Walsin’s export, every one carrying an X1 rating; 186 are Y2 and 181 are Y1, and the Y2 discs run from 10 pF to 10,000 pF while the Y1 discs stop at 4,700 pF.
At the values a power-supply input filter commonly uses, the counts thin out quickly. We measured 35 safety disc parts at 1,000 pF, 20 at 2,200 pF, 20 at 4,700 pF and 4 at 10,000 pF. All 4 at 10,000 pF are Y2 parts in the AC series, and all are plus or minus 20 percent.
| Value | Walsin disc part (example) | X1 / Y rating in export | Tolerance | Match / mismatch against a 4.7 nF Y2, 300 Vac brief | Your incumbent |
|---|---|---|---|---|---|
| 1,000 pF | YP1AC102K080 |
X1 440 Vac / Y2 300 Vac | 10% | Mismatch on value; match on class and voltage | |
| 2,200 pF | YU1AC222M080 |
X1 440 Vac / Y2 300 Vac | 20% | Mismatch on value; match on class and voltage | |
| 4,700 pF | YU1AC472M120 |
X1 440 Vac / Y2 300 Vac | 20% | Match on value, class and voltage | |
| 4,700 pF | YU0AC472M120 |
X1 440 Vac / Y2 250 Vac | 20% | Mismatch on Y2 voltage (250 against 300 Vac) | |
| 10,000 pF | YV1AC103M140 |
X1 440 Vac / Y2 300 Vac | 20% | Mismatch on value; only 4 Y2 discs reach it |
For the difference between the two Y classes, see our post on X1 Y1 versus X1 Y2 safety capacitors.
What does the last digit block of a Walsin safety disc number change?
The body size, not the rating. Our export lists two 4,700 pF, X1 440 Vac / Y2 300 Vac discs, YU1AC472M120 and YV1AC472M100, that differ only in the prefix letter and the last three digits; the rating fields are identical.
We hold no datasheet for the disc capacitor line, so we cannot tell you what each suffix decodes to in millimetres or lead spacing. We checked the export’s Lead Spacing column: it is empty on all 929 disc rows. Read the body diameter and lead spacing from Walsin’s own drawing before you lay out a board, and treat two parts with identical ratings as different mechanical parts until you have.
Is there a surface-mount X1 Y2 safety capacitor in Walsin’s MLCC export?
Yes, the S2 series. We counted 165 distinct S2 part numbers in four case sizes, 1808, 1812, 2211 and 2220, from 3 pF to 10 nF; the only S2 part at 10 nF is S242B103K502, an 1808.
One caution we have already published: the S2 “Rated Voltage” column in the export reads 5,000 or 6,000 Vdc on every row, and that is the impulse voltage, not the working voltage. Walsin’s approval sheet gives the working rating as X1 310 Vac and Y2 250 Vac. A filter that needs 300 Vac Y2 is a match for the AC discs above and a mismatch for S2 on that field, whatever the export column suggests. Compare the two lines in our post on how to cross-reference an MLCC.
What does the Hong Kong shelf hold for a Norwegian power-supply build?
Three surface-mount lines and no discs. We read the stock list as at 23 September 2026: it holds 1,125 part numbers, of which 3 are safety capacitors, all S2 surface-mount parts (S242B102K502, S252B222K502 and a 470 pF line), and 0 are safety discs.
The ready stock list is a dated snapshot, never live-synced. A 4.7 nF Y2 disc would be a request through the site, not a shelf pick. We make no lead-time or availability promise for any of the parts above.
How can Venatech help a Norwegian data centre or power-supply team?
How Venatech helps starts with the free cross-reference tool, VenaMatch, which decodes 18 manufacturers’ part numbers and covers 800,000+ crossable parts. Paste up to 500 part numbers or drop an Excel or CSV file, and each Walsin candidate comes back with every field marked match or mismatch. Upload a full BOM for review, and see the disc capacitor range.
We serve from Hong Kong in small lots, and you request a quote through the site. We hold no office, entity or stock in Norway. We hold no ISO 9001 or IATF 16949 certificate and give no legal, customs or conformity advice. Qualification stays with you.
The short version
- Statnett paused new data centre connection reservations, per Capacity on 9 November 2026, with 4,200 MW already reserved.
- Walsin’s 367 safety discs are all X1 rated: 186 Y2, 181 Y1.
- Only 4 Y2 discs reach 10 nF; 20 safety discs sit at 4.7 nF.
- The S2 surface-mount series has 165 parts; its export voltage column is the impulse rating.
- Nothing in the disc line is on our 23 September 2026 shelf.
Paste your input-filter capacitors into the free cross-reference tool and read every field as match or mismatch. Qualification stays with you.
Frequently asked questions
What did Statnett pause in Norway?
Per Capacity on 9 November 2026, Statnett temporarily stopped new grid connection reservations for data centres, citing fault ride-through, load changes and grid oscillations. The pause ends by 1 August 2027 at the latest. Connected sites are unaffected. These are the report’s statements, not ours.
How many Walsin X1 Y2 safety capacitors are there?
We counted 186 Y2 safety disc part numbers among 367 safety discs in Walsin’s export, all X1 rated, plus 165 surface-mount S2 parts. The Y2 discs run from 10 pF to 10,000 pF; only 4 reach 10,000 pF.
Is there a Walsin 4.7 nF Y2 disc at 300 Vac?
Yes. YU1AC472M120 and YV1AC472M100 are both 4,700 pF, X1 440 Vac and Y2 300 Vac in the export, at plus or minus 20 percent. Confirm the body size and lead spacing on Walsin’s drawing before layout.
Can I use the S2 series where a 300 Vac Y2 part is specified?
Not on that field. Walsin’s approval sheet gives S2 a Y2 working rating of 250 Vac. The 5,000 Vdc in the export’s Rated Voltage column is the impulse voltage. Check the datasheet and qualify in your own circuit.
Are safety discs on the Venatech shelf?
No. The stock list as at 23 September 2026 holds 3 safety capacitor lines, all S2 surface-mount parts, and no safety discs. Ask through the site for current availability; we give no lead-time or stock guarantee.
Does Venatech give advice on Norwegian grid requirements?
No. We give no legal, customs or conformity advice and have not read Statnett’s draft requirements. Confirm grid and product requirements with your compliance team. Venatech is a Hong Kong distributor, authorised for Walsin.
Related reading
- X1 Y1 versus X1 Y2 safety capacitors
- How to cross-reference an MLCC
- MLCC DC bias and voltage derating
- Free cross-reference tool and ready stock
Last reviewed 11 Nov 2026. Sources: Capacity, “Why Norway wants a say over who builds data centres”, 9 November 2026 (capacityglobal.com, fetched 11 Nov 2026); Venatech Walsin disc capacitor and MLCC exports and stock list as at 23 September 2026, re-measured 11 Nov 2026.