150 kVA Three Phase Pad Mounted Transformer
The 150 kVA three phase pad mounted transformer is one of the most frequently ordered sizes we make. It’s not entry-level and it’s not oversized — it’s the capacity that keeps showing up on commercial project specs because it actually fits the load. Oil-filled, dead-front enclosure, built to ANSI/IEEE. Primary voltage from 2.4 kV to 34.5 kV, secondary configurable. We build and test these in-house before they ship.
Power Rating
150 kVA
Phase
Three Phase
Primary Voltage
2.4–34.5 kV
Secondary Voltage
208Y/120V–480V
Standard
ANSI/IEEE
Cooling
ONAN
Certification
CE Certified
About the 150 kVA Pad Mounted Transformer
150 kVA has been a standard commercial spec for a long time. Engineers know it, contractors know it, and utility companies know it. That familiarity actually matters — it makes documentation, approval processes, and sourcing easier. If you’re putting together a project BOM or matching a spec sheet, this size usually fits without any back-and-forth.
Like all our pad mounted units, this one sits on a concrete pad at ground level. The steel enclosure locks shut. Dead-front termination means no exposed live parts on the primary side — which matters when the unit is going into a location where people might be nearby. Inside: cold-rolled silicon steel core, copper windings, mineral oil cooling. No external ventilation needed.
Compared to 112.5 kVA, this one handles a meaningful step up in load. The physical size doesn’t change that much — so if you’re on the fence between the two, 150 kVA is usually the more sensible call unless your load is consistently low.
What Makes This Transformer Worth Specifying
Enclosure Standard
ANSI/IEEE C57.12.28
The enclosure meets ANSI/IEEE C57.12.28. All cable connections — primary and secondary — are made inside the locked cabinet. No exposed live parts. That’s what makes the 150 kVA pad mounted transformer dead-front design suitable for publicly accessible locations without additional barriers around it.
Copper Windings
Standard configuration
Standard build uses copper windings. Higher conductivity means less heat under load and better efficiency over the unit’s service life. For the 150 kVA pad mounted transformer, copper winding is the default — aluminum is available if the project spec calls for it or cost is the priority.
Voltage Configuration
2.4 kV – 34.5 kV primary
Primary voltage from 2.4 kV to 34.5 kV. Secondary output — 208Y/120V, 240V, 480V, or something else — can be adjusted to what the project needs. Tap changer positions and connection type (Dyn11, YNyn0, others) are also configurable. If you’re not sure what combination works, share the grid voltage and we can work through it.
Testing & Documentation
CE · ISO 9001:2015
Each unit goes through routine testing before it leaves — ratio check, insulation resistance, no-load loss. As a 150 kVA pad mounted transformer manufacturer with export experience, we also have CE certification, ISO 9001:2015, and ISO 14001. If your project needs documentation for customs or compliance review, we can put it together.
Where This Transformer Fits
The 150 kVA three phase pad mounted transformer is the standard commercial specification for a reason — it matches the load profiles of mid-size office buildings, retail developments, schools, and similar facilities without being oversized. It’s a step up from the 112.5 kVA and a common choice for projects where that smaller size is getting close to its limit. If your load is higher or the project has significant growth planned, the 225 kVA or 300 kVA three phase pad mounted transformer is the next option worth looking at.
150 kVA Pad Mounted Transformer Specifications
| Parameter | Standard Value | Custom Available |
| Rated Power | 150 kVA | — |
| Phase | Three Phase | — |
| Primary Voltage | 2.4–34.5 kV | Custom |
| Secondary Voltage | 208Y/120V, 240V, 480V | Custom |
| Frequency | 60 Hz | 50 Hz available |
| Connection Type | Dyn11, YNyn0 | Custom |
| Cooling Method | ONAN (Mineral Oil) | Vegetable Oil |
| Temperature Rise | 65°C | 55°C available |
| Insulation Class | Class A | — |
| Enclosure Type | Pad Mounted, Dead-Front | — |
| Enclosure Standard | ANSI/IEEE C57.12.28 | — |
| Transformer Standard | ANSI/IEEE C57.12.00/34 | IEC 60076 |
| Winding Material | Copper | Aluminum |
| Core Material | Cold-rolled Silicon Steel | — |
| Impedance Voltage | 3.10% – 5.75% | Custom |
| Certifications | CE, ISO 9001:2015 | GOST available |
Need something different? Most parameters above can be adjusted for specific projects. Send us your voltage requirements and we’ll confirm what’s possible.
Frequently Asked Questions
What is a 150 kVA three phase pad mounted transformer used for?
It’s used to step down medium-voltage utility supply for mid-size commercial buildings, schools, retail developments, light industrial facilities, and similar projects. 150 kVA is one of the more standard commercial distribution sizes — it fits a broad range of projects that need reliable three-phase outdoor power without going into heavy industrial territory.
What is the difference between 112.5 kVA and 150 kVA?
About 33% more capacity. The physical size difference is not major, so if you’re deciding between the two and your load is pushing anywhere near the 112.5 kVA limit, 150 kVA is usually the smarter call. It gives you more headroom without a big jump in footprint or cost.
What voltage options are available?
Primary voltage from 2.4 kV to 34.5 kV. Standard secondary outputs are 208Y/120V, 240V, and 480V. Other combinations are available. Tell us your grid supply voltage and the output you need — we’ll confirm what works.
Can this transformer be customized?
Yes. Primary and secondary voltage, tap range, connection type (Dyn11, YNyn0, and others), winding material (copper or aluminum), oil type, enclosure color, nameplate language. Single units and project quantities are both accepted.
What standards does this transformer meet?
Manufactured to ANSI/IEEE C57.12.00 and C57.12.34. Enclosure meets ANSI/IEEE C57.12.28. CE documentation available. IEC 60076 configurations can be produced for projects outside North America.
How do I get a quote from a 150 kVA pad mounted transformer supplier in China?
We keep it simple. Send us the rated capacity, primary and secondary voltage, quantity, installation country, and any certification requirements. We respond within 24 hours. If you have a spec sheet, attach it and we’ll work from that.
