Custom R-Type Transformers
R-Type transformers use a round-section core to combine high efficiency, low stray field and a compact, low-noise package — a strong alternative to toroidal and EI where space and thermal performance matter. P&A International engineers, prototypes and delivers custom R-Type transformers, a few VA to multi-kVA, 50/60 Hz, built to your voltage, regulation 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 R-Type transformers
High efficiency
A round, gapless core path gives low losses, low no-load current and cool running.
Low noise & field
Even winding and core geometry keep stray field and audible hum low for sensitive electronics.
Compact & light
A space- and weight-efficient format where toroidal mounting or EI bulk is a problem.
Built to your spec
Custom voltages, taps, multiple windings, mounting and screens, DFM-reviewed.
Engineering capability
- Magnetic design & simulation — turns ratio, regulation, flux density, temperature rise
- Round-core grade & winding strategy for efficiency, low field and low noise
- Electrostatic screens and multi-winding / multi-output designs
- Safety construction — reinforced or screened isolation to IEC 61558 and EN 61558
- Mounting and clamping designed for your envelope
- 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 | R-Type (round core) |
| Power | A few VA – multi-kVA |
| Frequency | 50 / 60 Hz line frequency |
| Windings | Single & multi-output, taps, screens |
| Isolation | To CE / UL / IEC 61558; reinforced available |
| Mounting | Clamp, base plate, flying-lead |
| 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 magnetic simulation and DFM support, rapid samples, and R-Type transformers optimised for efficiency, low stray field, low noise and compactness. We design to your envelope — 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
Audio & hi-fi · medical and laboratory instrumentation · professional & broadcast electronics · test & measurement · lighting · compact power supplies.
Explore related types: toroidal, EI laminated and low-frequency & power transformers.
Choosing the right R-Type transformer
A few decisions shape every R-Type design — sharing this detail lets us quote and prototype faster:
| Why R-Type vs toroidal/EI | R-Type combines toroidal-like efficiency and low field with easier clamping and often lower height – good where space, weight or mounting is constrained. |
| Voltage & regulation | Primary/secondary voltages, taps and load regulation set the turns ratio, copper and core size. |
| Noise & field | Winding balance and core geometry minimise audible hum and radiated field for audio and instrumentation. |
| Temperature rise | Core and copper loss set the insulation class; we select core size, wire gauge and build to stay in your thermal limit. |
| Mounting | Clamp, base plate or flying-lead with terminations and dimensions to suit your enclosure. |
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 voltages, VA rating and number of outputs
- Load regulation, taps and any screen requirement
- Noise / stray-field constraints (audio, instrumentation)
- Isolation and safety requirements, and target standards
- Mechanical envelope, height limit and mounting
- 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 R-Type transformer RFQ checklist & selection quick reference (PDF)
Get a quote
Send your voltages, VA rating, height limit 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