Custom Three-Phase Transformers
Three-phase transformers power industrial machinery, renewable-energy systems and three-phase conversion. P&A International engineers, prototypes and delivers custom three-phase transformers — isolation, step-up/step-down, auto and control types in delta and star configurations, up to tens of kVA, 50/60 Hz — built to your voltages, vector group and mounting.
As an engineering-led contract manufacturer founded as an engineering consultancy, we assign one dedicated engineer to your project from design review to qualified samples in 10–15 working days, then scale into volume through our vetted partner-factory network, where every supplier is ISO 9000 certified or better.Request a quote ›
consultancy + manufacture
per project, end-to-end
qualified samples with test data
every supplier certified or better
one-off to high volume
Why choose PA three-phase transformers
Delta & star
Any vector group — delta, star, zig-zag and auto — with the phase configuration your system needs.
Step-up / step-down
Isolation, step-up and step-down designs for machinery, renewables and three-phase distribution.
Safe & compliant
Creepage/clearance, screens and construction to IEC 61558, CE and UL as specified.
Built to your spec
Custom voltages, taps, vector group, cooling and mounting, DFM-reviewed.
Engineering capability
- Magnetic design & simulation — turns ratio, vector group, regulation, temperature rise
- Core & lamination selection for efficiency, low noise and balanced phases
- Delta / star / zig-zag / auto configurations, taps and screens
- Safety construction to IEC 61558; creepage and clearance for the class you need
- Open-frame, encapsulated or enclosed builds; convection or forced cooling
- DFM review to hit target cost while preserving performance
- Qualified samples with full test data before any volume tooling
- One dedicated engineer owns the project end-to-end
At a glance
| Type | Three-phase — isolation / step / auto / control |
| Power | Up to tens of kVA |
| Frequency | 50 / 60 Hz line frequency |
| Configurations | Delta, star, zig-zag, auto; taps |
| Isolation | To CE / UL / IEC 61558; screens available |
| Build | Open-frame, encapsulated or enclosed |
| Prototype | 10–15 working days to qualified samples |
| Quality | Every supplier in our network is ISO 9000 certified or better |
Why engineers & buyers choose PA
For design engineers
A true design partner — one dedicated engineer, full simulation and DFM support, rapid samples, and three-phase transformers designed for your vector group, regulation, cooling and balanced-phase performance. We design to your system — not just catalogue parts.
For purchasing
Low-risk scalability — predictable 10–15-day prototypes, flexible MOQ from one-off to production, target-cost DFM, a single point of contact, and a vetted ISO 9000+ partner network managed end-to-end by P&A. No hand-offs, no surprises.
3 easy steps to get started
Send us your spec
Send your drawing or spec sheet. One dedicated engineer reviews it and confirms the technical details with you.
Proposed design & quote
You receive a proposed design and indicative pricing — typically within 48 hours — to review and refine together.
Samples & production
Qualified samples with full test data in 10–15 working days; on approval we scale into volume through our partner network.
Applications
Industrial machinery & drives · renewable-energy and energy storage · power distribution · HVAC and pumps · data-centre and telecom power · test and process equipment.
Explore related types: low-frequency & power transformers, EI laminated and toroidal transformers.
Choosing the right three-phase transformer
A few decisions shape every three-phase design — sharing this detail lets us quote and prototype faster:
| Vector group | Delta, star, zig-zag or auto — the configuration and phase shift your system needs sets the winding arrangement. |
| Voltage & taps | Primary/secondary line voltages, tap range and step-up/step-down ratio set the turns and core. |
| Rating & cooling | Continuous kVA, duty and ambient set the core size and whether convection or forced cooling is needed. |
| Isolation & safety | Creepage/clearance, screens and compliance to IEC 61558, CE and UL designed in from the start. |
| Build & mounting | Open-frame, encapsulated or enclosed with terminals and mounting to suit your panel or cabinet. |
What to send us for a fast, accurate quote
The more of this you can share, the quicker we can return a proposed design and price:
- Primary and secondary line voltages and kVA rating
- Vector group / configuration and any tap range
- Step-up or step-down ratio and frequency
- Isolation, screen and safety requirements, and target standards
- Cooling, enclosure and mounting; ambient temperature
- Target cost and annual volume or call-off pattern
- Any reference design, competitor part number or physical sample
Working from a competitor part or a sample is fine — our engineer will reverse-engineer it or design a drop-in equivalent to your specification.
📄 Download the three-phase transformer RFQ checklist & selection quick reference (PDF)
Get a quote
Send your line voltages, kVA, vector group and spec sheet and one dedicated engineer will reply — typically within 48 hours — with a proposed design and indicative pricing.
One dedicated engineer reviews every enquiry and replies with a proposed design and indicative pricing. Your details are used only to respond to your enquiry. Prefer email? support@pa-international.com.au