--- title: "Combined Pad-Mounted Transformer (Integrated MV Switching) | Entogo" description: "American-style combined pad-mounted transformer integrating the medium-voltage load-break switch, fuse protection and low-voltage distribution with the…" url: https://entogo.ca/products/combined-pad-mounted-transformer/ lang: en type: website image: https://entogo.ca/_astro/Entogo-Combined-Transformer.Dnpo8NDr.png alternates: en: https://entogo.ca/products/combined-pad-mounted-transformer/ fr-CA: https://entogo.ca/fr/products/combined-pad-mounted-transformer/ es: https://entogo.ca/es/products/combined-pad-mounted-transformer/ ar: https://entogo.ca/ar/products/combined-pad-mounted-transformer/ site: https://entogo.ca/ llms: https://entogo.ca/llms.txt --- Home › Products › Transformers & Substations › Combined Pad-Mounted Transformer (Integrated MV Switching) Transformers & Substations # Combined Pad-Mounted Transformer (Integrated MV Switching) 75 – 2500 kVA · 15/25/35 kV class Configure & quote ## Customize your Combined Pad-Mounted Transformer (Integrated MV Switching) and get a quote. [Configure & get a quote](https://entogo.ca/products/transformer-quote/?from=Combined%20Pad-Mounted%20Transformer%20(Integrated%20MV%20Switching)) ![Entogo American-style combined pad-mounted transformer with integrated MV switching](https://entogo.ca/_astro/Entogo-Combined-Transformer.Dnpo8NDr_ZpRF3M.webp) Overview American-style 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. Entogo designs and builds the Combined Pad-Mounted Transformer (Integrated MV Switching) 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 **combined pad-mounted transformer** follows the North-American “American-style” single-tank format: the medium-voltage load-break switch, bayonet and current-limiting fuse protection, and low-voltage distribution are integrated with the transformer in one tamper-resistant tank — so the unit switches and self-protects without a separate pad-mounted switchgear cabinet. Ratings span **75 to 2500 kVA**, **15 / 25 / 35 kV class** to 480Y/277, 208Y/120 or 240/120 V at 60 Hz. Dead-front loadbreak elbows support loop- or radial-feed connection, and the compact **NEMA 3R** cabinet in ANSI 70 green suits commercial, campus and light-industrial pads. Mineral-oil filled with an FR3 natural-ester option, the unit is designed and built to **IEEE C57.12.34** / .28 and **CSA C88**, with UL (cULus) / CSA certification available on request. ## Key features - Single-tank "American-style" design integrating the MV load-break switch, fuse protection and LV distribution with the transformer — no separate switchgear cabinet. - Designed and built to IEEE C57.12.34 / .28 and CSA C88, 60 Hz — UL (cULus) / CSA certification available on request. - Dead-front loadbreak elbows, loop- or radial-feed; bayonet plus current-limiting fuses for self-protection. - Compact, tamper-resistant NEMA 3R cabinet in ANSI 70 green for commercial, campus and light-industrial pads. - Mineral oil standard; FR3 natural ester optional for fire-safer urban siting. Custom-engineered · built to order [Get a quote](https://entogo.ca/products/transformer-quote/?from=Combined%20Pad-Mounted%20Transformer%20(Integrated%20MV%20Switching)) 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 Combined Pad-Mounted Transformer (Integrated MV Switching) specifications | Specification | Value | | --- | --- | | Applicable standards | IEEE C57.12.34 / C57.12.28 / C57.12.90 · CSA C88 | | Type | Combined (single-tank) pad-mounted transformer with integral MV switching | | Rated capacity | 75 – 2500 kVA | | Primary (HV) voltage | 12.47 / 13.8 / 24.94 / 34.5 kV (15 / 25 / 35 kV class) | | Secondary (LV) voltage | 208Y/120, 480Y/277, 240/120 V | | Frequency | 60 Hz | | MV switching | Oil-immersed load-break switch; bayonet + current-limiting fuse protection | | Feed | Loop or radial, dead-front loadbreak elbows | | Cooling / rise | ONAN · 65 °C average winding rise | | Enclosure | Tamper-resistant, NEMA 3R, ANSI 70 green | Glossary: [Pad-mounted transformer](https://entogo.ca/glossary/#pad-mounted-transformer) [60 Hz vs. 50 Hz](https://entogo.ca/glossary/#60-hz-vs-50-hz) [Dead-front vs. live-front](https://entogo.ca/glossary/#dead-front-live-front) [Loop-feed vs. radial-feed](https://entogo.ca/glossary/#loop-feed-radial-feed) [Ring main unit](https://entogo.ca/glossary/#ring-main-unit) ## Applications - Commercial and campus medium-voltage service - Light-industrial and infrastructure sites - Utility loop-feed distribution where in-tank switching saves space - EV-charging hubs and distributed loads 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 - **How is a combined transformer different from a standard pad-mount?**: A combined (American-style) unit puts the medium-voltage load-break switch and fuse protection inside the transformer tank, so it self-protects and switches without a separate pad-mounted switchgear cabinet — saving footprint on commercial and campus pads. - **What standards and ratings apply?**: 75 – 2500 kVA, 15 / 25 / 35 kV class primary to 480Y/277 or 208Y/120 secondary, 60 Hz. Designed to IEEE C57.12.34 / .28 and CSA C88; UL (cULus) / CSA certification available on request. 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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