Transformers & Substations

Combined Pad-Mounted Transformer (Integrated MV Switching)

75 – 2500 kVA · 15/25/35 kV class

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Entogo American-style combined pad-mounted transformer with integrated MV switching

Overview

American-style combined pad-mounted transformer integrating the medium-voltage load-break switch, fuse protection and low-voltage distribution with the transformer in one tamper-resistant tank — 75–2500 kVA, 15/25/35 kV class, 60 Hz. Designed to IEEE C57.12.34/.28; UL/CSA certifiable.

This combined pad-mounted transformer follows the North-American “American-style” single-tank format: the medium-voltage load-break switch, bayonet and current-limiting fuse protection, and low-voltage distribution are integrated with the transformer in one tamper-resistant tank — so the unit switches and self-protects without a separate pad-mounted switchgear cabinet. Ratings span 75 to 2500 kVA, 15 / 25 / 35 kV class to 480Y/277, 208Y/120 or 240/120 V at 60 Hz.

Dead-front loadbreak elbows support loop- or radial-feed connection, and the compact NEMA 3R cabinet in ANSI 70 green suits commercial, campus and light-industrial pads. Mineral-oil filled with an FR3 natural-ester option, the unit is designed and built to IEEE C57.12.34 / .28 and CSA C88, with UL (cULus) / CSA certification available on request.

Key features

  • Single-tank "American-style" design integrating the MV load-break switch, fuse protection and LV distribution with the transformer — no separate switchgear cabinet.
  • Designed and built to IEEE C57.12.34 / .28 and CSA C88, 60 Hz — UL (cULus) / CSA certification available on request.
  • Dead-front loadbreak elbows, loop- or radial-feed; bayonet plus current-limiting fuses for self-protection.
  • Compact, tamper-resistant NEMA 3R cabinet in ANSI 70 green for commercial, campus and light-industrial pads.
  • Mineral oil standard; FR3 natural ester optional for fire-safer urban siting.

FAQ

Common questions

How is a combined transformer different from a standard pad-mount?
A combined (American-style) unit puts the medium-voltage load-break switch and fuse protection inside the transformer tank, so it self-protects and switches without a separate pad-mounted switchgear cabinet — saving footprint on commercial and campus pads.
What standards and ratings apply?
75 – 2500 kVA, 15 / 25 / 35 kV class primary to 480Y/277 or 208Y/120 secondary, 60 Hz. Designed to IEEE C57.12.34 / .28 and CSA C88; UL (cULus) / CSA certification available on request.

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