--- title: "Pad-Mounted Compact Secondary Unit Substation | Entogo" description: "A factory-assembled compact secondary unit substation — incoming medium-voltage switching, distribution transformer (≤2500 kVA) and a low-voltage section…" url: https://entogo.ca/products/compact-secondary-unit-substation/ lang: en type: website image: https://entogo.ca/_astro/Entogo-Prefabricated-Substation-Series.DVq0FUxf.png alternates: en: https://entogo.ca/products/compact-secondary-unit-substation/ fr-CA: https://entogo.ca/fr/products/compact-secondary-unit-substation/ es: https://entogo.ca/es/products/compact-secondary-unit-substation/ ar: https://entogo.ca/ar/products/compact-secondary-unit-substation/ site: https://entogo.ca/ llms: https://entogo.ca/llms.txt --- Home › Products › Transformers & Substations › Pad-Mounted Compact Secondary Unit Substation Transformers & Substations # Pad-Mounted Compact Secondary Unit Substation 15/25 kV class · ≤ 2500 kVA ![Entogo pad-mounted compact secondary unit substation for commercial and industrial service](https://entogo.ca/_astro/Entogo-Prefabricated-Substation-Series.DVq0FUxf_Z1q59Nl.webp) Overview 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. Entogo designs and builds the Pad-Mounted Compact Secondary Unit Substation 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 **pad-mounted compact secondary unit substation** packages the incoming medium-voltage switching, the distribution transformer (up to **2500 kVA**) and the low-voltage distribution section into a single factory-assembled, weather-tight enclosure for **15 / 25 kV class** commercial and industrial service. It is the North-American unit-substation answer to a kiosk box substation, delivered ready to set down on a prepared pad and connect. Dead-front loadbreak switching with fuse (or vacuum-breaker) protection supports loop- or radial-feed connection, and the tamper-resistant **NEMA 3R** enclosure in ANSI 70 green suits buildings, campuses, malls and light-industrial sites. The assembly is factory-tested as a complete substation to compress on-site commissioning, and is designed and built to **IEEE C37.121**, ANSI C57.12.34 / .28 and IEC 62271-202 — with UL (cULus) / CSA certification available on request. ## Key features - Single factory-assembled, weather-tight enclosure combining MV switching, transformer and LV distribution — replaces a bolted-together pad-mount + cabinet on site. - Designed and built to IEEE C37.121 (unit substations), ANSI C57.12.34 / .28 and IEC 62271-202, 60 Hz — UL (cULus) / CSA certification available on request. - Dead-front loadbreak switching and fuse (or vacuum breaker) protection; loop- or radial-feed. - Tamper-resistant NEMA 3R enclosure, ANSI 70 green, for commercial, institutional and light-industrial sites. - Factory-tested as a complete substation to compress on-site commissioning. Custom-engineered · built to order [Get a quote](https://entogo.ca/contact/) 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 Pad-Mounted Compact Secondary Unit Substation specifications | Specification | Value | | --- | --- | | Applicable standards | IEEE C37.121 · ANSI C57.12.34 / C57.12.28 · IEC 62271-202 · CSA | | Type | Compact secondary / unit substation, pad-mounted, single enclosure | | Voltage class (HV) | 15 / 25 kV class (12.47 / 13.8 / 24.94 kV) | | Transformer rating | Up to 2500 kVA | | Secondary (LV) voltage | 208Y/120, 480Y/277, 600 V | | Frequency | 60 Hz | | Sections | MV switching + transformer + LV distribution, close-coupled | | MV switching | Load-break switch + fuse (vacuum breaker optional) | | Enclosure | NEMA 3R, tamper-resistant, ANSI 70 green / galvanized + powder coat | Glossary: [Unit substation](https://entogo.ca/glossary/#unit-substation) [60 Hz vs. 50 Hz](https://entogo.ca/glossary/#60-hz-vs-50-hz) [Pad-mounted transformer](https://entogo.ca/glossary/#pad-mounted-transformer) [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) [Voltage class](https://entogo.ca/glossary/#voltage-class) ## Applications - Commercial and institutional buildings, campuses and malls - Light industrial plants and infrastructure sites - EV-charging hubs and distributed commercial loads - Utility loop-feed distribution points 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 - **What is a compact secondary (unit) substation?**: It is a factory-assembled package that close-couples the incoming medium-voltage switching, the distribution transformer and the low-voltage section in one weather-tight enclosure — the North-American equivalent of a kiosk box substation, delivered ready to set down on a pad. - **How does it differ from the 36 kV unit substation?**: This compact secondary substation targets 15 / 25 kV class commercial and industrial service up to 2500 kVA; the 36 kV outdoor unit substation covers 34.5 kV class utility, renewables and larger industrial duty up to 10,000 kVA. - **Which standards and certifications apply?**: Designed to IEEE C37.121, ANSI C57.12.34 / .28 and IEC 62271-202, 60 Hz. 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. View](https://entogo.ca/products/amorphous-core-dry-type-transformer/) Request a quote ## Talk to engineering about the Pad-Mounted Compact Secondary Unit Substation. 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