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

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.

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.

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.

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