---
title: "OEM Transformer Manufacturer & Private Label | Entogo"
description: "OEM transformer manufacturer: pad-mounted, pole-mounted, dry-type and power transformers and unit substations — custom or private-label, ANSI/IEEE or IEC."
url: https://entogo.ca/contract-manufacturing/transformers/
lang: en
type: website
image: https://entogo.ca/_astro/entogo-pad-mounted-transformer-warehouse.B5pxtmo4.jpg
alternates:
  en: https://entogo.ca/contract-manufacturing/transformers/
  fr-CA: https://entogo.ca/fr/contract-manufacturing/transformers/
  fr: https://entogo.ca/fr/contract-manufacturing/transformers/
  es: https://entogo.ca/es/contract-manufacturing/transformers/
  ar: https://entogo.ca/ar/contract-manufacturing/transformers/
  pl: https://entogo.ca/pl/contract-manufacturing/transformers/
  ro: https://entogo.ca/ro/contract-manufacturing/transformers/
  ru-KZ: https://entogo.ca/ru/contract-manufacturing/transformers/
  ru-UZ: https://entogo.ca/ru/contract-manufacturing/transformers/
  ru-KG: https://entogo.ca/ru/contract-manufacturing/transformers/
  ru-TJ: https://entogo.ca/ru/contract-manufacturing/transformers/
  ru-TM: https://entogo.ca/ru/contract-manufacturing/transformers/
  ru-AZ: https://entogo.ca/ru/contract-manufacturing/transformers/
  ru-AM: https://entogo.ca/ru/contract-manufacturing/transformers/
  ru-GE: https://entogo.ca/ru/contract-manufacturing/transformers/
site: https://entogo.ca/
llms: https://entogo.ca/llms.txt
---

Entogo home › OEM & contract manufacturing › Transformers & substations

Transformer OEM

# OEM transformer manufacturer for distribution and power transformers

Pad-mounted, pole-mounted, dry-type and power transformers and packaged unit substations — built to your drawings, customized from our designs or supplied under your brand, with North-American-spec builds in 16–24 weeks.

OEM

Entogo is an OEM transformer manufacturer and contract manufacturer for utilities, EPC contractors, equipment brands and distributors — a Canadian company with its own factory in China. It builds pad-mounted, pole-mounted, dry-type and power transformers and packaged unit substations to the buyer’s drawings (build-to-print), as customized versions of its catalogue designs, or private-label under the buyer’s brand. Units are designed to IEEE C57 — distribution transformers also to DOE 10 CFR 431 efficiency — or to IEC 60076 for export, and certified to the buyer’s market requirements on request — UL (cULus), CSA, CE or IEC CB; North-American-spec builds ship in 16–24 weeks.

![OEM transformer manufacturer for distribution and power transformers](https://entogo.ca/_astro/entogo-pad-mounted-transformer-warehouse.B5pxtmo4_rjHfn.webp)

What we build

## Transformer and substation types available OEM

Built on the catalogue designs below or entirely to your drawings — ratings shown are catalogue ranges; other ratings are quoted per project.

### Pad-mounted transformers

Three-phase, liquid-filled, 75–2500 kVA, 15/25/35 kV class, dead-front loop- or radial-feed; combined units integrate MV load-break switching and fusing in the same tank.

### Pole-mounted transformers

Single-phase overhead units, 10–167 kVA, conventional or completely self-protected (CSP), plus complete pole-mount packages with cutout, arrester and hardware.

### Dry-type transformers

Ventilated three-phase units, 15–2500 kVA, 600 V class and medium voltage to 35 kV class, 220 °C insulation; cast-resin / VPI and amorphous-core versions available.

### Power transformers

Oil-immersed three-phase units, 2.5–31.5 MVA, for 34.5 / 35 / 36 kV substation and subtransmission duty, ONAN / ONAF, off-circuit or on-load tap changing.

### Packaged unit substations

Compact secondary unit substations (15/25 kV class, up to 2500 kVA), 36 kV outdoor unit substations (1,000–10,000 kVA) and modular skid-mounted step-up / collector substations.

### Inverter-duty and low-loss designs

Solar / storage step-up skids to 34.5 kV for PV and BESS interconnection, and three-dimensional wound-core and amorphous-core transformers for loss-evaluated bids.

What can be customized

## Engineered to your specification, labeled as your product

Typical customization areas for OEM and private-label transformers — the exact scope is confirmed in the quotation.

### Electrical design

kVA / MVA rating, primary and secondary voltages, BIL, taps, impedance, loss targets, cooling class and copper or aluminum windings to your specification or utility standard.

### Tank, enclosure and accessories

Loop- or radial-feed, dead- or live-front, bushings, gauges, insulating fluid (mineral oil or FR3 natural ester), enclosure, paint color and footprint to your drawings.

### Components of your choice

Specified bushings, switches, fuses, tap changers and monitoring devices from your preferred brands where the design allows — confirmed in the quotation.

### Private label

Your brand on the nameplate, decals, test reports and manuals. Minimum order quantity, branding and packaging are confirmed per project in the quotation.

### Documentation and labeling

Approval drawings, nameplates, test reports and O&M manuals in your format, document numbering and language — scope confirmed in the quotation.

### Build-to-print

Manufactured to your drawings, specifications and bill of materials, with approval drawings issued for your sign-off before production starts.

Standards & certification

## ANSI/IEEE for North America, IEC for export

Designed to IEEE C57, CSA and DOE efficiency standards for the U.S. and Canada, or to IEC 60076 for export — and certified to your market’s requirements on request: UL (cULus), CSA, CE or IEC CB.

### IEEE C57 design basis

IEEE C57.12.00, C57.12.34 (pad-mounted), C57.12.20 (overhead) and C57.12.10 (power), C57.12.28 enclosure integrity and C57.12.90 test code; CSA C88 and CSA C9 in Canada.

### DOE efficiency

Distribution transformers designed to U.S. DOE 10 CFR 431 minimum efficiency, with amorphous-metal cores for utilities that evaluate no-load losses.

### UL / CSA certification

UL (cULus) and CSA certification available on request for your model and rating (UL 1561 / 1562 for dry-type); orders needing new certification ship within 36 weeks.

### IEC and export

IEC 60076 transformers and IEC 62271-202 substations for export markets, built in about 12 weeks; CE marking and IEC CB certification on request, with timing and scope confirmed in the quotation.

### Management systems

Built under ISO 9001, ISO 14001, ISO 45001 and IATF 16949 management systems, with CE and IEC CB Scheme marks held across product lines.

Quality & delivery

## Tested in our own factory, delivered on a dependable schedule

### Lead time

North-American-spec builds in 16–24 weeks; within 36 weeks when new cULus/CSA certification is needed; IEC/CE units in about 12 weeks — the same as catalogue products.

### Routine tests and FAT

Routine tests to the applicable IEEE or IEC test code before shipment, with factory acceptance test documentation, quality inspection reports and serial-number records.

### Witnessed inspection

Third-party inspection or a witnessed factory acceptance test can be arranged for eligible projects.

### Warranty

Warranty term set per product, minimum 36 months — a manufacturer warranty issued by Entogo Inc., with term and coverage confirmed per contract.

### Confidentiality and origin

Your drawings and specifications are covered by a non-disclosure agreement. China is stated as the country of origin up front, so duties and origin requirements can be planned.

Base models

## Catalogue transformers and substations we build on

[![Representative outline drawing of an Entogo three-phase dead-front pad-mounted transformer — front and side elevations, not a photograph](https://entogo.ca/_astro/Entogo-Three-Phase-Pad-Mounted-Transformer-Outline.BEuthAyQ_ggksH.webp) Transformers & substations ### 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) Transformers & substations ### 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) Transformers & substations ### 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 primary to 35 kV class stepping down 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) Transformers & substations ### Modular Skid-Mounted Unit Substation (Step-Up / Collector) A fully modular, skid-mounted unit substation for renewable collector and step-up duty — cutting site footprint by ~30% and design/installation time by ~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/)[![Entogo 36 kV class three-phase oil-immersed power transformer for substations](https://entogo.ca/_astro/Entogo-35kV-Three-Phase-Oil-Immersed-Distribution-Transformer.BWoRk9EQ_Z1dAjmQ.webp) Transformers & substations ### 36 kV Oil-Immersed Power Transformer A liquid-filled (mineral oil) three-phase power transformer for substation and subtransmission duty in 34.5 / 35 / 36 kV networks, rated 2.5 to 31.5 MVA with ONAN / ONAF cooling, off-circuit or on-load tap changing and copper windings, designed to IEEE C57.12.00 / C57.12.10 and IEC 60076. View](https://entogo.ca/products/oil-immersed-power-transformer-36kv/)[![Entogo single-phase overhead pole-mounted distribution transformer](https://entogo.ca/_astro/Entogo-Oil-Immersed-Power-Transformer.CrmqSHyg_1u981k.webp) Transformers & substations ### Single-Phase Overhead (Pole-Mounted) Distribution Transformer Single-phase overhead pole-mounted distribution transformers for North American utility lines — 10 to 167 kVA, 7200 / 12470GrdY / 24940GrdY primary to 120/240 V secondary, conventional or completely self-protected (CSP). Designed to IEEE C57.12.20 and DOE 10 CFR 431 efficiency, 60 Hz; UL / CSA certifiable. View](https://entogo.ca/products/single-phase-pole-mounted-transformer/)[![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) Transformers & substations ### Three-Phase Dry-Type Distribution Transformer 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. View](https://entogo.ca/products/three-phase-dry-type-distribution-transformer/)[![Entogo three-dimensional triangular wound-core low-loss distribution transformer](https://entogo.ca/_astro/Entogo-Stereoscopic-Triangular-Transformer.ChH9EFSn_Z1ffw8C.webp) Transformers & substations ### Three-Dimensional Wound-Core Transformer (Low-Loss) A three-dimensional (triangular) wound-core distribution transformer with a closed, symmetric core for lower no-load loss, balanced flux, low noise and high short-circuit withstand — oil-filled or dry-type, 15/25/35 kV class, 60 Hz. Designed to IEEE C57/UL and DOE 10 CFR 431; UL/CSA certifiable. View](https://entogo.ca/products/wound-core-distribution-transformer/)[![Entogo combined pad-mounted transformer with integrated MV switching](https://entogo.ca/_astro/Entogo-Combined-Transformer.Dnpo8NDr_ZpRF3M.webp) Transformers & substations ### Combined Pad-Mounted Transformer (Integrated MV Switching) Combined pad-mounted transformer integrating the medium-voltage load-break switch, fuse protection and low-voltage distribution with the transformer in one tamper-resistant tank — 75–2500 kVA, 15/25/35 kV class, 60 Hz. Designed to IEEE C57.12.34/.28; UL/CSA certifiable. View](https://entogo.ca/products/combined-pad-mounted-transformer/)[![Entogo overhead pole-mounted distribution transformer complete set with cutout and arrester](https://entogo.ca/_astro/Entogo-10kV-Pole-Mounted-Transformer-Complete-Set.CbDfTClh_ZOxieg.webp) Transformers & substations ### Overhead Distribution Transformer Set (Pole-Mount Package) A complete overhead pole-mount distribution package — transformer, fused cutout, lightning arrester, secondary/metering pedestal, jumpers and hardware — engineered to a single 15 kV class, 60 Hz specification. Transformer designed to IEEE C57.12.20 and DOE 10 CFR 431; UL/CSA certifiable. View](https://entogo.ca/products/pole-mount-transformer-set/)[![Entogo pad-mounted compact secondary unit substation for commercial and industrial service](https://entogo.ca/_astro/Entogo-Prefabricated-Substation-Series.DVq0FUxf_Z1q59Nl.webp) Transformers & substations ### Pad-Mounted Compact Secondary Unit Substation A factory-assembled compact secondary unit substation — incoming medium-voltage switching, distribution transformer (≤2500 kVA) and a low-voltage section in one weather-tight pad-mounted enclosure for 15/25 kV class service, 60 Hz. Designed to IEEE C37.121, ANSI C57.12.34 and IEC 62271-202; UL/CSA certifiable. View](https://entogo.ca/products/compact-secondary-unit-substation/)[![Entogo inverter-duty solar and storage step-up unit substation skid](https://entogo.ca/_astro/Entogo-New-Energy-Integrated-PV-Prefabricated-Box-Substation.BbhcGbvm_Z1ULC7s.webp) Transformers & substations ### Solar / Storage Skid — Inverter-Duty Step-Up Unit Substation An inverter-duty step-up unit substation (solar/storage skid) integrating a liquid-filled step-up transformer, MV switching and inverter interface — stepping inverter output up to 34.5 kV for PV and battery-storage interconnection, 60 Hz. Designed to IEEE C57.12.34, C57.159 and C37.121; UL/CSA certifiable. View](https://entogo.ca/products/solar-storage-skid-substation/)

OEM

## Transformer OEM questions

- **Is Entogo a transformer manufacturer or a trading company?**: Entogo is a Canadian company with its own factory in China — a vertically integrated plant of about 20,000 m², not a third-party supplier whose products it resells. Entogo Inc. signs the contract, provides engineering support and issues the warranty.
- **Can you build transformers to our drawings and specification?**: Yes. Entogo builds to customer drawings, specifications and utility standards (build-to-print) or customizes its own catalogue designs — rating, voltages, taps, impedance, losses, windings, tank and accessories. Approval drawings are issued for your sign-off before production.
- **Can you supply private-label transformers under our brand?**: Yes. The nameplate, labels, test reports and manuals can carry your brand. Minimum order quantity, branding and packaging are not published as fixed terms; they are confirmed per project in the quotation, and the engagement can be covered by a non-disclosure agreement.
- **What is the lead time for an OEM or custom transformer?**: OEM and customized units follow the same lead times as catalogue products: 16–24 weeks for North-American-spec (ANSI/IEEE) builds, within 36 weeks when the order needs new cULus/CSA certification, and about 12 weeks for IEC/CE equipment built for export markets.
- **Do OEM transformers carry UL or CSA certification?**: Transformers are designed to IEEE C57, CSA C88 / C9 and DOE 10 CFR 431, and can be certified to your market’s requirements on request — UL (cULus), CSA, CE or IEC CB. Orders that need new cULus/CSA certification ship within 36 weeks; timing and scope for your model and rating are confirmed in the quotation.
- **Where are the transformers made, and how does that affect Buy America projects?**: In Entogo’s own factory in China. Entogo states the country of origin up front so you can plan duties, tariffs and project origin requirements — for example Buy America or BABA-funded work — before you order.

OEM by product line

## Every product line, available OEM, customized or private-label

- [Switchgear & distribution Metal-clad, metal-enclosed and pad-mounted MV switchgear, LV switchboards, switchgear and MCCs, and metering equipment — to your spec or under your brand.](https://entogo.ca/contract-manufacturing/switchgear/)
- [Battery energy storage Liquid- and air-cooled C&I cabinets, containerized BESS and grid-forming PV-storage systems — customized or supplied private-label under your brand.](https://entogo.ca/contract-manufacturing/energy-storage/)
- [EV chargers AC home and commercial chargers, DC fast and ultra-fast chargers and PV-storage charging units — OEM or white-label under your brand.](https://entogo.ca/contract-manufacturing/ev-chargers/)

OEM

## Send your transformer specification.

[Request an OEM quote](https://entogo.ca/contract-manufacturing/#rfq)

Drawings, a datasheet or a short description of your requirement — our engineering team replies within one business day, under NDA if you need one.

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_Markdown twin of https://entogo.ca/contract-manufacturing/transformers/ — generated at build time from the same content as the HTML page. Company facts, catalogue index and contact: https://entogo.ca/llms.txt_