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Pad-Mounted Transformers — ANSI/IEEE C57.12 Loop & Radial Feed
Pad-mounted transformers are dead-front, tamper-resistant oil-immersed units for underground distribution, built to ANSI/IEEE C57.12 with loop-feed or radial-feed configurations. Rated 25–2500 kVA, 2.4–35 kV primary and 120/240–600 V secondary, mineral-oil insulation with 65 K temperature rise. Suitable for underground residential distribution, commercial complexes, and industrial sites.
Key Features
- ANSI/IEEE C57.12 construction for North American distribution networks
- Loop-feed and radial-feed configurations for ring or spur network layouts
- Dead-front, tamper-resistant compartmented enclosure for public-safety installations
- Mineral-oil insulation with sealed tank and pressure-relief protection
- Pad-mountable base with lifting provisions and cable compartment
Applications
- Underground residential distribution
- Commercial and retail complexes
- Industrial and campus networks
- Suburban and urban infill projects
Selection Guide
Network layout
Choose loop-feed for ring networks, radial-feed for spur connections.
Voltage
2.4–35 kV primary to match the local distribution voltage.
Installation
Pad-mounted, tamper-resistant enclosure for ground-level public installation.
- Frequently Asked Questions
What is the difference between loop-feed and radial-feed?
Loop-feed units have two HV bushings so they can be connected in a ring for higher continuity; radial-feed units have a single HV connection for spur networks.
Which standard do pad-mounted transformers follow?
ANSI/IEEE C57.12 for the transformer and IEEE C57.12.28 for the pad-mounted enclosure.
Are they suitable for public locations?
Yes — the dead-front, tamper-resistant compartmented design is intended for ground-level installation in public and residential areas.
What secondary voltages are available?
Commonly 120/240 V single-phase and 208Y/120 or 480Y/277 V three-phase.
Instant Selection & Quote Calculator
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| Base price (interpolation) | $2,332 |
| × Product factor | ×1.0000 |
| × Country factor | ×1.0000 |
| × Copper-linked factor | ×1.0000 |
| + Options / accessories | $0 |
Aluminum winding — no copper linkage
Reference prices are for estimation only and do not constitute a formal offer.
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