--- title: "Three-Phase Pad-Mounted Distribution Transformer | Entogo" description: "Three-phase pad-mounted distribution transformer for North-American utility, commercial and industrial service — 75–2500 kVA, 12.47–34.5 kV class primary…" url: https://entogo.ca/products/three-phase-pad-mounted-transformer/ lang: en type: website image: https://entogo.ca/_astro/Entogo-10kV-Three-Phase-Oil-Immersed-Distribution-Transformer.MmNE1ATv.png alternates: en: https://entogo.ca/products/three-phase-pad-mounted-transformer/ fr-CA: https://entogo.ca/fr/products/three-phase-pad-mounted-transformer/ es: https://entogo.ca/es/products/three-phase-pad-mounted-transformer/ ar: https://entogo.ca/ar/products/three-phase-pad-mounted-transformer/ site: https://entogo.ca/ llms: https://entogo.ca/llms.txt --- Home › Products › Transformers & Substations › Three-Phase Pad-Mounted Distribution Transformer Transformers & Substations # Three-Phase Pad-Mounted Distribution Transformer 75 – 2500 kVA · 15/25/35 kV class Configure & quote ## Customize your Three-Phase Pad-Mounted Distribution Transformer and get a quote. [Configure & get a quote](https://entogo.ca/products/transformer-quote/?from=Three-Phase%20Pad-Mounted%20Distribution%20Transformer) ![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)![Entogo three-phase pad-mounted distribution transformer, dead-front, NEMA 3R enclosure — view 2](https://entogo.ca/_astro/Entogo-10kV-Three-Phase-Oil-Immersed-Distribution-Transformer-Alt1.DWl5ScdH_28RxP8.webp) Overview 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. Entogo designs and builds the Three-Phase Pad-Mounted Distribution Transformer in its own factory with a vertically integrated supply chain: this product ships in 16–24 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 pad-mounted distribution transformer** is the North-American form factor for ground-level medium-voltage service: a liquid-filled core-and-coil in a locked, tamper-resistant steel cabinet that sits on a concrete pad with no fence or pole required. Ratings span **75 to 2500 kVA**, with 12.47 / 13.8 / 24.94 / 34.5 kV (15 / 25 / 35 kV class) primaries stepping down to **480Y/277**, 208Y/120 or 240/120 V secondaries at 60 Hz. Electrical and mechanical configuration is specified per project — primary and secondary voltage, BIL by class, loop- or radial-feed dead-front bushings (live-front on request), de-energized tap changer, copper or aluminum windings, and mineral-oil or FR3 natural-ester insulation. The core-and-coil meets DOE **10 CFR 431** efficiency, and an amorphous-metal core is available where a utility evaluates no-load losses. Designed and built to **IEEE C57.12.34** / .28 and CSA C88, with UL (cULus) / CSA certification available on request. ## Key features - Designed and built to IEEE C57.12.34 (three-phase pad-mounted) and C57.12.28 (enclosure integrity), 60 Hz — UL (cULus) / CSA certification available on request. - DOE 10 CFR 431 efficiency-compliant core-and-coil; low-loss amorphous-metal core optional for loss-evaluated bids. - Dead-front, 200 A loadbreak bushing wells for operator-safe switching; loop-feed (6 bushing) or radial-feed (3 bushing) configurations. - Tamper-resistant NEMA 3R cabinet, ANSI 70 green powder coat, pad-lockable, per utility security requirements. - Mineral oil standard; FR3 natural ester available for fire-safer, biodegradable insulation in urban and indoor-adjacent siting. - Copper or aluminum windings; de-energized tap changer (±2 × 2.5 %); configuration specified per project. Custom-engineered · built to order [Get a quote](https://entogo.ca/products/transformer-quote/?from=Three-Phase%20Pad-Mounted%20Distribution%20Transformer) Lead time 16–24 weeks Order now for estimated delivery Jan 2027 – Mar 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 Pad-Mounted Distribution Transformer specifications | Specification | Value | | --- | --- | | Applicable standards | IEEE C57.12.00 / C57.12.34 / C57.12.28 / C57.12.90 · DOE 10 CFR 431 · CSA C88 | | Type | Three-phase, liquid-filled, pad-mounted | | Rated capacity | 75 – 2500 kVA (to 3000 kVA) | | Primary (HV) voltage | 12.47 / 13.2 / 13.8 / 24.94 / 34.5 kV (15 / 25 / 35 kV class) | | BIL (HV) | 95 / 125 / 150 kV by voltage class | | Secondary (LV) voltage | 208Y/120, 480Y/277, 240/120, 600 V | | Frequency | 60 Hz | | Cooling / temperature rise | ONAN · 65 °C average winding rise | | Feed | Dead-front loop-feed (6 bushings) or radial-feed (3 bushings); live-front optional | | Tap changer | De-energized ±2 × 2.5 % standard | | Insulating liquid | Mineral oil (FR3 natural ester optional) | | Windings | Copper or aluminum | | Enclosure | Tamper-resistant, NEMA 3R, ANSI 70 green powder coat | | Efficiency | DOE 10 CFR 431 compliant | Glossary: [Dead-front vs. live-front](https://entogo.ca/glossary/#dead-front-live-front) [60 Hz vs. 50 Hz](https://entogo.ca/glossary/#60-hz-vs-50-hz) [DOE 10 CFR 431 efficiency](https://entogo.ca/glossary/#doe-10-cfr-431) [Loop-feed vs. radial-feed](https://entogo.ca/glossary/#loop-feed-radial-feed) [Taps](https://entogo.ca/glossary/#taps) [Liquid-filled](https://entogo.ca/glossary/#liquid-filled-transformer) ## Applications - Utility distribution (underground residential and commercial) - Commercial and industrial building service - Data-center and campus medium-voltage step-down - Solar PV and battery-storage interconnection 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 - **Is the pad-mounted transformer DOE 2016 (10 CFR 431) efficiency compliant?**: Yes. The core-and-coil is designed to meet the U.S. DOE 10 CFR 431 minimum efficiency requirements for liquid-immersed distribution transformers. A low-loss amorphous-metal core is also available where a utility evaluates no-load losses in the bid. - **What primary and secondary voltages are available?**: Standard North-American primaries are 12.47, 13.2, 13.8 (15 kV class), 24.94 (25 kV class) and 34.5 kV (35 kV class); secondaries are 208Y/120, 480Y/277, 240/120 and 600 V. All units are 60 Hz. Other combinations are built to order. - **Is it UL listed or CSA certified?**: Units are designed and built to IEEE C57.12.34 / C57.12.28 and CSA C88. UL (cULus) and CSA certification is available on request; certified units ship within a guaranteed 36-week worst case. - **Loop-feed or radial-feed — which configuration do I need?**: Radial-feed (3 dead-front bushings) suits a single-source tap; loop-feed (6 bushings) lets the unit be fed from either direction and sectionalized, the common choice for underground utility loops. Both are available. Power Equipment ## Related products [![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. View](https://entogo.ca/products/amorphous-core-dry-type-transformer/)[![Entogo modular skid-mounted step-up collector unit substation for renewables](https://entogo.ca/_astro/Entogo-Modular-Prefabricated-Substation-Boosting-Station.ER8-5pAg_1FgNst.webp) Power Equipment ### Modular Skid-Mounted Unit Substation (Step-Up / Collector) A fully modular, skid-mounted unit substation for renewable collector and step-up (boosting) duty — cutting site footprint ~30% and design/install time ~70%, with cloud-based remote diagnostics. Up to 38 kV class, 60 Hz; designed to IEEE C37.121/ANSI C57.12.34; UL/CSA certifiable. View](https://entogo.ca/products/modular-skid-unit-substation/) ## Structured data (JSON-LD) ```json {"@context":"https://schema.org","@type":"Product","@id":"https://entogo.ca/products/three-phase-pad-mounted-transformer/#product","url":"https://entogo.ca/products/three-phase-pad-mounted-transformer/","name":"Three-Phase Pad-Mounted Distribution Transformer","description":"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. 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