Transformers & Substations

Single-Phase Overhead (Pole-Mounted) Distribution Transformer

10 – 167 kVA · conventional or CSP

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Entogo single-phase overhead pole-mounted distribution transformer

Overview

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.

These single-phase overhead pole-mounted distribution transformers serve North-American utility and rural lines, bringing transformation close to the load on the pole. Ratings run 10 to 167 kVA at 60 Hz, with 7200, 12470GrdY/7200, 13200, 14400 or 24940GrdY/14400 V primaries and a standard 120/240 V residential secondary; three-phase service is supplied as a bank of single-phase units.

Each unit is built conventional (external protection) or completely self-protected (CSP), with the primary fuse, lightning arrester and secondary circuit breaker integrated into the transformer. The sealed tank gives strong overload capacity and simple maintenance for unattended sites. Designed and built to IEEE C57.12.20 and DOE 10 CFR 431 efficiency, mineral-oil filled with an FR3 natural-ester option; UL / CSA certification is available on request.

Key features

  • Designed and built to IEEE C57.12.20 (overhead distribution transformers), 60 Hz — UL / CSA certification available on request.
  • Conventional or completely self-protected (CSP) build with integral primary fuse, lightning arrester and secondary circuit breaker.
  • DOE 10 CFR 431 efficiency-compliant; mineral oil standard, FR3 natural ester optional.
  • Standard 120/240 V residential secondary; three-phase service supplied as a bank of single-phase units.
  • Sealed tank with strong overload capacity and simple, low-maintenance service for rural and overhead lines.

FAQ

Common questions

What is the difference between conventional and CSP transformers?
A conventional transformer relies on external protection (cutout fuse, separate arrester). A completely self-protected (CSP) unit builds the primary fuse, lightning arrester and a secondary circuit breaker into the transformer, simplifying the pole installation. Both are available.
What voltages and ratings are standard?
Single-phase ratings are 10 – 167 kVA at 7200, 12470GrdY/7200, 13200, 14400 or 24940GrdY/14400 V primary and 120/240 V secondary, 60 Hz. Three-phase overhead service is supplied as a bank of single-phase units.
Are these DOE-efficient and certifiable for North America?
Yes — built to IEEE C57.12.20 and DOE 10 CFR 431 efficiency. UL / CSA certification is available on request, with certified units shipping within a guaranteed 36-week worst case.

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