--- title: "Three-Phase Dry-Type Distribution Transformer | Entogo" description: "A three-phase ventilated dry-type distribution transformer for indoor commercial/industrial service — 15–2500 kVA, low-voltage 600 V class (480 to…" url: https://entogo.ca/products/three-phase-dry-type-distribution-transformer/ lang: en type: website image: https://entogo.ca/_astro/Entogo-Three-Phase-Dry-Type-Distribution-Transformer.CFPX-dwa.png alternates: en: https://entogo.ca/products/three-phase-dry-type-distribution-transformer/ fr-CA: https://entogo.ca/fr/products/three-phase-dry-type-distribution-transformer/ es: https://entogo.ca/es/products/three-phase-dry-type-distribution-transformer/ ar: https://entogo.ca/ar/products/three-phase-dry-type-distribution-transformer/ site: https://entogo.ca/ llms: https://entogo.ca/llms.txt --- Home › Products › Transformers & Substations › Three-Phase Dry-Type Distribution Transformer Transformers & Substations # Three-Phase Dry-Type Distribution Transformer 15 – 2500 kVA · LV 600 V class & MV Configure & quote ## Customize your Three-Phase Dry-Type Distribution Transformer and get a quote. [Configure & get a quote](https://entogo.ca/products/transformer-quote/?from=Three-Phase%20Dry-Type%20Distribution%20Transformer) ![Entogo three-phase ventilated dry-type distribution transformer for indoor installation](https://entogo.ca/_astro/Entogo-Three-Phase-Dry-Type-Distribution-Transformer.CFPX-dwa_ZTA5IE.webp) Overview A three-phase ventilated dry-type distribution transformer for indoor commercial/industrial service — 15–2500 kVA, low-voltage 600 V class (480 to 208Y/120) and medium-voltage to 35 kV class, 220 °C insulation. Designed to UL 1561/1562, CSA C9 and DOE 10 CFR 431; UL/CSA certifiable. Entogo designs and builds the Three-Phase Dry-Type Distribution Transformer in its own factory with a vertically integrated supply chain: this product ships in 12–18 weeks (new UL or CSA certification can extend that, within a guaranteed 36-week worst case), and every Entogo product carries a minimum 36-month manufacturer warranty. This **three-phase ventilated dry-type distribution transformer** pairs DOE-compliant efficiency with the oil-free, fire-safe installation that occupied buildings and indoor electrical rooms require. Ratings span **15 to 2500 kVA** at 60 Hz, in both low-voltage **600 V class** configurations (for example 480 V delta to 208Y/120) and medium-voltage units with primaries to the **35 kV class**. A **220 °C insulation system** with standard 150 °C rise (115 °C or 80 °C optional) gives margin for continuous loading, and K-factor windings handle the harmonic content of data-center and other non-linear loads. Copper or aluminum windings, NEMA 1 / 2 indoor or 3R outdoor enclosures, and cast-resin or VPI construction are specified per project. Designed and built to **UL 1561 / 1562**, NEMA and CSA C9, with UL (cULus) / CSA certification available on request. ## Key features - Designed and built to UL 1561 (≤600 V) / UL 1562 (>600 V), NEMA and CSA C9, 60 Hz — UL (cULus) / CSA certification available on request. - Oil-free, fire-safe construction for indoor installation where liquid-filled units are prohibited (schools, hospitals, high-rises). - DOE 10 CFR 431 efficiency-compliant; 220 °C insulation system with standard 150 °C rise (115 °C / 80 °C optional). - Low-voltage 600 V class (e.g. 480 Δ to 208Y/120) and medium-voltage configurations to 35 kV class. - K-factor windings available for harmonic / non-linear loads; copper or aluminum windings. - NEMA 1 / 2 indoor or 3R outdoor enclosure; configuration specified per project. Custom-engineered · built to order [Get a quote](https://entogo.ca/products/transformer-quote/?from=Three-Phase%20Dry-Type%20Distribution%20Transformer) Lead time 12–18 weeks Order now for estimated delivery Dec 2026 – Jan 2027. Certification / testing may extend this per the standard and scope. Quality & certifications - ![UL safety certification mark](https://entogo.ca/_astro/Entogo-UL-Underwriters-Laboratories-North-America-Safety-Certification.BoQ45DeX_248O3C.webp) - ![CSA certification mark](https://entogo.ca/_astro/Entogo-CSA-Canadian-Standards-Association-Safety-Certification.CY1FySDR_Z11vFCD.webp) - ![CE European Conformity marking](https://entogo.ca/_astro/Entogo-CE-European-Conformity-Marking.xJPMJKcl_1wU1NT.webp) - ![ISO 9001 quality management mark](https://entogo.ca/_astro/Entogo-ISO-9001-Quality-Management-System-Certification.DbscJvvM_47kvy.webp) - ![ISO 14001 environmental management mark](https://entogo.ca/_astro/Entogo-ISO-14001-Environmental-Management-System-Certification.DXOTPjd4_Z4rpDm.webp) - ![IEC CB Scheme mark](https://entogo.ca/_astro/Entogo-CB-Scheme-IEC-International-Electrical-Certification.CPXJ4xZK_aV0YT.webp) Built under audited ISO quality systems and to ANSI/IEEE & IEC standards. Product-level UL (cULus) / CSA certification available on request. [See all certifications](https://entogo.ca/certifications/) ## Specifications Three-Phase Dry-Type Distribution Transformer specifications | Specification | Value | | --- | --- | | Applicable standards | UL 1561 (≤600 V) / UL 1562 (>600 V) · NEMA ST20 · CSA C9 / C802.2 · DOE 10 CFR 431 | | Type | Three-phase, ventilated dry-type (AA); cast-resin / VPI available | | Rated capacity | 15 – 2500 kVA | | Low-voltage units | 600 V class — e.g. 480 Δ to 208Y/120 or 480Y/277 | | Medium-voltage units | Primary to 35 kV class (15 / 25 / 35 kV) | | Frequency | 60 Hz | | Insulation system / rise | 220 °C insulation, 150 °C rise (115 °C / 80 °C optional) | | Enclosure | NEMA 1 / 2 (indoor) or 3R (outdoor) | | Windings | Copper or aluminum; K-factor (non-linear load) optional | | Efficiency | DOE 10 CFR 431 compliant | Glossary: [Dry-type transformer](https://entogo.ca/glossary/#dry-type-transformer) [60 Hz vs. 50 Hz](https://entogo.ca/glossary/#60-hz-vs-50-hz) [Liquid-filled](https://entogo.ca/glossary/#liquid-filled-transformer) [DOE 10 CFR 431 efficiency](https://entogo.ca/glossary/#doe-10-cfr-431) [K-factor](https://entogo.ca/glossary/#k-factor) ## Applications - Indoor commercial and institutional power (schools, hospitals, offices) - Industrial plants and process facilities - Data centers and IT loads (K-factor) - EV-charging and renewable-energy step-down where oil is prohibited Sizing & protection Size this transformer and its overcurrent protection before you request a quote — full-load current, primary/secondary OCPD (NEC 450.3(B) / CEC Section 26), available fault current for downstream AIC / SCCR, and a NEMA enclosure. [Open the sizing calculator](https://entogo.ca/tools/transformer-sizing-calculator/) Payment & financing Flexible payment and project financing is available for qualified projects — milestone-based plans, reduced upfront terms and third-party financing. Entogo is the equipment supplier, not a lender; all options are subject to credit review and a signed agreement. [See payment options](https://entogo.ca/payment-options/) After-sales Backed by Entogo lifecycle service — technical support, spare parts and a minimum 36-month warranty (well beyond the industry norm; up to 10 years on major power equipment, confirmed per contract). Our team responds to every request within one business day. [After-sales support](https://entogo.ca/support/) [Track an order](https://entogo.ca/support/order-status/) FAQ ## Common questions - **When should I choose dry-type instead of a liquid-filled transformer?**: Dry-type units are oil-free and fire-safe, so they are specified for indoor and occupied-building installations — schools, hospitals, high-rises, data centers — where liquid-filled transformers are restricted by code or preference. - **What voltages and ratings are available?**: 15 – 2500 kVA, 60 Hz. Low-voltage 600 V class units (e.g. 480 V delta to 208Y/120 or 480Y/277) and medium-voltage units with primaries to the 35 kV class are built to order. - **Are these DOE-compliant and UL certifiable?**: Yes — designed to UL 1561 / 1562, NEMA and DOE 10 CFR 431 efficiency. UL (cULus) / CSA certification is available on request, with certified units shipping within a guaranteed 36-week worst case. Power Equipment ## Related products [![Entogo three-phase pad-mounted distribution transformer, dead-front, NEMA 3R enclosure](https://entogo.ca/_astro/Entogo-10kV-Three-Phase-Oil-Immersed-Distribution-Transformer.MmNE1ATv_Z1W8tN.webp) Power Equipment ### Three-Phase Pad-Mounted Distribution Transformer Three-phase pad-mounted distribution transformer for North-American utility, commercial and industrial service — 75–2500 kVA, 12.47–34.5 kV class primary to 480Y/277 or 208Y/120 secondary, dead-front loop/radial-feed, NEMA 3R. Designed to IEEE C57.12.34 and DOE 10 CFR 431; UL/CSA certifiable. View](https://entogo.ca/products/three-phase-pad-mounted-transformer/)[![Entogo 36 kV outdoor compact unit substation for renewables and industrial sites](https://entogo.ca/_astro/Entogo-35kV-Chinese-Type-Substation.Dvb2rMnE_Z1wVTEq.webp) Power Equipment ### 36 kV Outdoor Compact Unit Substation A factory-assembled outdoor unit substation — incoming 34.5 / 35 kV switchgear, liquid-filled step-up or step-down transformer (1,000 – 10,000 kVA) and a low-voltage section in one weather-tight enclosure — for solar PV, wind, and industrial interconnection. Built to IEEE C37.121, ANSI C57.12.34 and IEC 62271-202. View](https://entogo.ca/products/outdoor-unit-substation-36kv/)[![Entogo amorphous-core high-efficiency dry-type transformer](https://entogo.ca/_astro/Entogo-SCBH15-Amorphous-Alloy-Dry-Type-Transformer.CfCVUmci_Z56Pvf.webp) Power Equipment ### Amorphous-Core Dry-Type Transformer (High-Efficiency) A high-efficiency amorphous-metal-core dry-type transformer with very low no-load loss, low noise and low partial discharge — 30–2500 kVA, medium voltage to 35 kV class stepping to 480/208 V, fire-safe. Designed to UL 1562, CSA C9/C802.2 and DOE 10 CFR 431; UL/CSA certifiable. 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