Transformers & Substations

Three-Phase Pad-Mounted Distribution Transformer

75 – 2500 kVA · 15/25/35 kV class

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Representative outline drawing of an Entogo three-phase dead-front pad-mounted transformer — front and side elevations, not a photograph

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, a Canadian company, builds the Three-Phase Pad-Mounted Distribution Transformer in its own factory in China with a vertically integrated supply chain — factory-direct pricing, shipping in 16–24 weeks (within 36 weeks when the order needs new cULus/CSA certification), and a minimum 36-month manufacturer warranty backed by Entogo Inc. in Toronto.

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 / C57.12.28 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 load-break 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, padlockable, per utility security requirements.
  • Mineral oil standard; FR3 natural ester available as a less-flammable, biodegradable insulating fluid for 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

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Lead time

16–24 weeks

Order now for estimated delivery Feb 2027 – Mar 2027.

Certification and testing may extend this, depending on the applicable standard and scope.

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 36 weeks.
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, making it the common choice for underground utility loops. Both are available.

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