Schneider Electric Trihal cast-resin dry-type transformer

Schneider Electric Trihal cast-resin transformers, 160 kVA to 15 MVA at up to 36 kV with F1 fire class

Schneider Electric Trihal cast-resin dry-type transformer is one of 32 data center transformers tracked in the SecondWatt catalogue, each with specifications, lead times and indicative secondary-market pricing.

Schneider Electric Trihal dossier: cast-resin 160 kVA-15 MVA at 36 kV, F1 fire class, used unit priced at 15,000 EUR, inspection checklist, failure points.

Trihal is Schneider Electric's cast-resin dry-type transformer range within the SeT Series, commercialized globally with catalogs, BIM objects, and live SKU pages. Ratings run 160 kVA to 15 MVA at up to 36 kV. A documented 60 Hz example is a 1,500 kVA, 23 kV to 480Y/277 unit with AN cooling, IP31 enclosure, aluminum windings, cast-resin HV coils, and pre-impregnated LV windings. Class certification is the selling point: IEC 60076-11 fire behavior class F1, environmental class E2, and climatic class C2, with test results published against HD 464 S1. EU-market units ship as dedicated Eco-Design SKUs under Regulation 548/2014. Cooling is AN standard with AF fan packages, and enclosures run IP00 to IP31 in the observed SKUs. Trihal is one of the few transformer lines with a public used-market price: a 2013 unit in excellent condition listed at 15,000 EUR EXW on Machineseeker, where the cast-resin category held 2,781 listings in August 2026. US supply appears through repair houses such as GES with price-on-request listings. The duplicate backlog slug schneider-trihal covers this same product.

Who buys it

Commercial building engineers, data center fit-outs, marine and tunnel projects, and industrial plants in IEC markets specify Trihal; US buyers encounter it in imported package equipment and IEC-spec colocation builds. Used-market buyers are typically cost-driven European industrials, since 60 Hz US-voltage used units are scarce.

Role in the data center

Indoor MV/LV transformation for IEC-market data halls and imported modular power blocks, where F1 fire class removes oil-room engineering.

Key specifications

Technical summary

Range: 160 kVA-15 MVA HV: up to 36 kV Example 60 Hz unit: 1,500 kVA, 23 kV to 480Y/277 Cooling: AN standard; AF option Windings: cast-resin HV, pre-impregnated LV; aluminum standard Classes: F1 fire, E2 environmental, C2 climatic (IEC 60076-11) Enclosures: IP00-IP31 observed EU compliance: Ecodesign Regulation 548/2014 (Eco-Design SKUs) LV winding: pre-impregnated; HV cast under vacuum Altitude: below 2,600 m (example SKU)

Pricing and availability

Comparable secondary-market band: 6150–7700 EUR per unit. Trend: up Lead time, new: 20-32 weeks (dry-type class). Lead time, used or refurbished: 1-8 weeks (European dealers). Warranty, used: 3-year typical from major US rebuilders.

Lifecycle and maintenance

Cast-resin and VPI dry-type transformers typically serve 25-30+ years with minimal maintenance: periodic cleaning, PD testing on critical units, fan service on AF designs, and torque checks. There is no oil system to sample, so temperature and PD are the condition indicators. Rebuild options are limited compared with liquid units; failed coils are usually replaced rather than repaired, which makes pre-purchase PD and visual inspection decisive for used units.

Common failure points

• Partial discharge — PD in resin voids degrading insulation toward failure
• Resin cracking — Cracks from thermal cycling or mechanical shock
• Contamination — Dust and conductive debris enabling surface tracking
• Cooling fans — Failed AF fans derating capacity
• Connections — Loose terminations overheating under load
• Overheating under harmonics — Excess temperature on non-linear loads beyond K-rating

Inspection checklist

Partial discharge — PD test per IEC 60270 practice; readings above 10 pC warrant investigation on cast-resin coils Resin condition — inspect all coils per IEC 60076-11 practice for cracks and crazing from thermal cycling; any through-crack fails Insulation resistance — megger HV/LV/ground; polarization index of 2.0 or higher passes Turns ratio — TTR on all tap positions; deviation beyond 0.5% from nameplate fails Winding resistance — three-phase balance within 2% between phases Contamination — inspect for dust and conductive debris between coils; contamination is a leading dry-type failure driver Cooling fans (AF units) — run-test all fans and verify temperature controller setpoints Temperature sensors — verify RTD or thermocouple channels read within 5 C of a reference at ambient Connections — torque-check HV and LV terminations; thermal-scan at first energization and re-check within 12 months Clearances — verify electrical clearances and enclosure IP rating match the installation environment Class verification — confirm fire/environmental/climatic classes (F1, E2/E3, C2/C3) against nameplate Harmonic suitability — verify K-factor rating (K-4/K-13) against the intended non-linear load profile Core and frame — inspect for shipping damage and loose core bolts; verify single core ground Energization test — verify secondary voltage within 5% on all phases and no abnormal sound level Records — factory test certificate, PD test data, and service history; missing PD data reprices the unit

Procurement channels

Schneider distribution for new; Machineseeker (2,781 cast-resin listings) and European dealers for used; GES Repair for US price-on-request units. Square D-brand used dry-types trade separately on eBay and GEI Surplus.