PRODUCTS > STEP-DOWN TRANSFORMERS

Custom Step-Down Transformers, Built to Your Voltage

Pacific Transformer designs and builds custom step-down transformers wound to your exact input and output voltages — no off-the-shelf compromises. Single-phase or three-phase, isolated or autotransformer, from a single prototype to 10,000+ unit runs.

Free engineering designs. Quotes in 24 hours. Prototypes in 48. Catalog pricing on custom work.

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Wound to Spec

Step-Down Transformers, Wound to Spec

A step-down transformer reduces incoming line voltage to the lower level your equipment requires — 480V to 240V, 240V to 120V, 120V to 24V, or any ratio your application calls for. We wind each unit to your precise turns ratio, VA rating, frequency, and mounting footprint, so it drops into your design rather than forcing your design around it.

Need an isolated step-down for clean, safe low-voltage power, or a compact autotransformer for efficient conversion? Our engineers spec the right approach for free — and every unit is individually tested before it ships, not batch-sampled.

Send us your specs

Typical Specifications PTC-SD

Configuration Single- & three-phase

Voltage Ratios 480 / 240 / 208 / 120 V + custom

Design Types Isolated & autotransformer

Power Range A few VA up to 750 kVA

Frequency 50 / 60 / 400 Hz

Order Quantity No minimum — 1 to 10,000+

750kVA

Max Power Rating

3ø

Single & Three-Phase

400Hz

50 / 60 / 400 Hz

0MOQ

1 to 10,000+ Units

Applications

Where Step-Down Transformers Are Used

Wherever a higher supply voltage has to become a usable one — from the plant floor to imported gear to sensitive lab instruments.

Industrial Machinery

Drop plant 480 V down to 240 or 120 V control power for motors, drives, and PLCs.

Lighting & Controls

Step-down power for lighting circuits, control panels, and instrumentation.

Imported Equipment

Match overseas equipment to local supply — or local equipment to 230 V markets.

Medical & Lab

Isolated step-down designs with electrostatic shielding for sensitive electronics.

Keep Exploring

Explore More Custom Transformers

Parent Hub Custom Transformers The full range of custom magnetics we design and build — Step-Down is one of six families. Start here. Back to the hub

01 Current Transformers (CTs) Current transformers (CTs) for accurate metering, protection, and monitoring. 02 Flyback Transformers High-frequency designs for switch-mode supplies, EV charging, and industrial electronics. 03 High-Frequency Transformers Compact, low-loss transformers for switch-mode and high-frequency power conversion. 04 Isolation Transformers Galvanically isolated, electrostatically shielded designs for clean, safe power. 05 PDU Transformers Power distribution unit transformers for data centers and critical power. 06 Pulse Transformers Fast-edge pulse transformers for signal coupling, gate drive, and timing. 07 Step-Up Transformers Boost lower input voltages to the higher levels your equipment requires. 08 Three-Phase Transformers Three-phase transformers for industrial power, distribution, and high-load applications. 09 Toroidal Transformers Low-noise, high-efficiency cores for audio, medical, and instrumentation. 10 Voltage / Potential Transformers (VTs/PTs) Voltage (potential) transformers for safe, accurate high-voltage measurement. 11 Guitar Amp TransformersCatalog Parts Available Output, power, and choke transformers for guitar amps — stock or custom. 12 Distribution TransformersCatalog Parts Available Single and three-phase distribution units up to 750 kVA. 13 Padmount TransformersCatalog Parts Available Pad-mounted transformers for commercial and utility sites.

Industries Served

From NASA payloads to guitar amplifiers, Pacific Transformer's custom magnetics power some of the most demanding applications in the world. Our engineering team has deep experience across industries where compliance, performance, and reliability aren't optional — they're required.

Aerospace

Defense

Medical & Dental

Automotive & EV

Audio

Conveyance Systems

Industrial & Commercial

Power Quality & Measurement

Alternative Energy

Data Center

Utilities

FREQUENTLY ASKED QUESTIONS

Step-Down Transformers

A step-down transformer lowers an incoming AC voltage to a lower output voltage using a turns ratio where the secondary has fewer turns than the primary. It lets equipment rated for a lower voltage run safely from a higher supply.

Yes — we wind to any input/output ratio you specify (480→240, 240→120, 277→120, or fully custom), in single-phase or three-phase, with the exact VA rating and footprint your design needs.

An isolated step-down transformer has separate primary and secondary windings, giving galvanic isolation and noise rejection. An autotransformer shares a single winding — smaller and more efficient, but without isolation. We help you choose based on safety and space requirements.

No. We build from a single prototype to production runs of 10,000+, with free engineering and a working prototype typically in 48 hours.

Get a Quote

A few questions in — a quote back in one business day.

Our quoting system walks you through your project one question at a time — voltages, quantities, application — and builds your drawings as you go. A PACTRAN applications engineer stands behind every quote.

1DAY

Quote turnaround

Pricing and lead time within 1 business day

2DAYS

Prototype turnaround

A wound, tested prototype in 2 business days

Prefer to talk it through? 800-325-0501

Start your quote

Takes about 5 min

We'll ask, for example

What input voltage does your design see?

01
Describe your project. In your own words — give us what you know.
02
Answer a few guided questions. We only ask what your quote needs.
03
Get your quote. Pricing, lead time, and preliminary drawings — reviewed by an engineer.

Start My Quote No account needed. Free engineering review.

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