300 kVA Three Phase Pad Mounted Transformer
The 300 kVA three phase pad mounted transformer is a project-level spec. It’s not the size you pick for a single building — it’s what shows up on drawings for industrial parks, larger infrastructure projects, and commercial sites with serious load requirements. Oil-filled, dead-front enclosure, built to ANSI/IEEE. Primary voltage from 2.4 kV to 34.5 kV, secondary configurable. Production runs across our Nanjing and Yueqing facilities support project-quantity orders.
Power Rating
300 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 300 kVA Pad Mounted Transformer
300 kVA is where the pad mounted range starts feeling industrial. It’s not a step up from 225 kVA in the same way 225 was a step up from 150 — at 300 kVA, the use cases shift. You’re not talking about a single commercial building anymore. You’re talking about a distribution node for a small industrial park, a primary feed point for a larger facility, or a utility-side connection for infrastructure that needs a reliable, sizeable transformer on a concrete pad.
The build is the same — silicon steel core, copper windings, mineral oil, dead-front enclosure. But at this capacity, the unit is doing more work. It’s feeding multiple loads or a single high-demand load, often continuously. That’s why the quality control process matters more here than it does at the smaller sizes.
If 225 kVA is still feeling like the right ballpark but you want more room, 300 kVA is the answer. If your load profile is already firmly industrial, 750 kVA might be a better starting point.
Why Projects Spec This Size
Distribution Node
Not just a building feed
At 300 kVA, you’re usually not serving a single building — you’re serving a section of a site. Industrial parks, logistics facilities, mixed-use developments with multiple tenants. The transformer becomes a distribution point that multiple downstream loads connect to. That changes how you think about sizing, redundancy, and future-proofing.
Project Quantities
Two facilities, reliable output
A lot of 300 kVA orders aren’t single units — they’re two or three for an industrial park phase, or a batch for an infrastructure rollout. We have production capacity across our Nanjing and Yueqing facilities to handle project-scale volumes without lead time issues. If you’re sourcing for a project BOM, that’s worth factoring in.
Enclosure Standard
ANSI/IEEE C57.12.28
The enclosure meets ANSI/IEEE C57.12.28. Dead-front termination, lockable cabinet, no exposed live parts. At 300 kVA this matters because the unit is often going into locations with more foot traffic — loading docks, access roads, utility corridors. The same enclosure standard that works for a small commercial site also works here.
Configuration Flexibility
CE · ISO 9001:2015
Primary voltage from 2.4 kV to 34.5 kV, secondary configurable. At this size, projects sometimes have specific impedance requirements or non-standard connection types. We can work through those before production starts — engineering review included for non-catalog configurations. Documentation for customs and compliance is available.
Where This Transformer Gets Specified
The 300 kVA three phase pad mounted transformer shows up as a project-standard unit on industrial park drawings, infrastructure distribution networks, and larger commercial facilities where a single transformer needs to carry a serious load. It’s the step above the commercial range and the entry point into the industrial distribution range. For projects where the load profile goes significantly beyond this, the 750 kVA three phase pad mounted transformer is the next option to look at.
300 kVA Pad Mounted Transformer Specifications
| Parameter | Standard Value | Custom Available |
| Rated Power | 300 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 |
Project-specific configurations — impedance values, connection types, voltage combinations — can be worked through before production. Send your spec and we’ll confirm.
Product Detail
300 kVA Pad Mounted Transformer — Secondary Terminals
Secondary terminal connections on the 300 kVA unit — phase-labeled and ready for cable installation.
Frequently Asked Questions
What is a 300 kVA three phase pad mounted transformer used for?
Mostly industrial parks, larger commercial facilities, and infrastructure projects where the load goes beyond what the standard commercial range covers. At 300 kVA, you’re usually feeding multiple loads or a single high-demand load — it’s less of a building transformer and more of a distribution node.
How does 300 kVA compare to 750 kVA?
300 kVA is the entry point of the industrial distribution range. 750 kVA is for heavier loads — large factories, major infrastructure, high-demand industrial sites. If your load is firmly industrial but not at full industrial scale, 300 kVA is usually the right call. If you’re running heavy machinery or serving a large site, 750 kVA is worth looking at.
What voltage options are available?
Primary voltage from 2.4 kV to 34.5 kV. Standard secondary outputs are 208Y/120V, 240V, and 480V. Project-specific voltage combinations and impedance values can be configured — tell us your grid supply and output requirements.
Can you handle project quantities?
Yes. A lot of 300 kVA orders are project quantities — two or three units for a phase, a batch for an infrastructure rollout. We have production capacity across two facilities to handle this without lead time issues. Send us the quantity and timeline and we’ll confirm availability.
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 300 kVA pad mounted transformer supplier in China?
Send us the rated capacity, primary and secondary voltage, quantity, installation country, and any certification requirements. If you have a spec sheet or project BOM, attach it. We respond within 24 hours.
