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Pacific Transformer designs and manufactures a line of pre-designed guitar amp transformers that can be purchased directly through our ecommerce site, Pacific Audio Magnetics.

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PRODUCTS > VOLTAGE / POTENTIAL TRANSFORMERS

Custom Voltage & Potential Transformers, Built for Accuracy

Pacific Transformer designs and builds custom voltage transformers — also called potential transformers — for safe, accurate measurement of high-voltage circuits. Up to 35 kV primary with a standard 120 V secondary, in metering and protection classes, single-phase or three-phase.

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

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Custom voltage and potential transformers for metering and protection

Wound to Spec

Voltage / Potential Transformers, Wound to Spec

A voltage transformer (VT), historically called a potential transformer (PT), scales a high system voltage down to a standardized low-voltage signal — typically 120 V — so meters, relays, and monitoring equipment can measure it without being exposed to the primary. Unlike a power transformer, the job is not to deliver energy but to reproduce the primary waveform faithfully at the burden it actually sees.

We wind VTs up to 35 kV primary with 120 V secondaries and custom ratios, in metering (0.3) and protection classes, at 50 or 60 Hz, with the rated burden your instrumentation requires. Our engineers spec insulation system, ratio, and burden for free, and every unit is individually ratio-tested and hipot-verified before it ships, not batch-sampled.

Send us your specs
Typical Specifications PTC-VT
Configuration Single- & three-phase
Voltage Ratios Up to 35 kV primary / 120 V secondary + custom
Accuracy Class Metering (0.3) & protection
Burden Rated VA to spec
Frequency 50 / 60 Hz
Order Quantity No minimums, no maximums
35kV
Max Primary Voltage
0.3Class
Metering Accuracy
120V
Standard Secondary
0MOQ
No Minimums, No Maximums

Applications

Where Voltage & Potential Transformers Are Used

Anywhere system voltage has to be measured accurately and safely — the revenue meter, the relay panel, the SCADA point, and the test bench.

Revenue Metering

Class 0.3 accuracy for billing-grade voltage measurement at utility and campus meters.

Protective Relaying

Accurate voltage reference for over/under-voltage, distance, and sync-check relays.

Power Monitoring

Scaled voltage signals for SCADA, switchgear instrumentation, and power quality systems.

Test & Lab

High-accuracy reference VTs for calibration benches, test stands, and lab setups.

Keep Exploring

Explore More Custom Transformers

Parent Hub Custom Transformers The full range of custom magnetics we design and build — compare every transformer type in one place. 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-Down Transformers Voltage conversion for machinery, imported equipment, and OEM gear. 08 Step-Up Transformers Boost lower input voltages to the higher levels your equipment requires. 09 Three-Phase Transformers Three-phase transformers for industrial power, distribution, and high-load applications. 10 Toroidal Transformers Low-noise, high-efficiency cores for audio, medical, and instrumentation. 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

Aerospace

Defense

Defense

Medical & Dental

Medical & Dental

Automotive & EV

Automotive & EV

Audio

Audio

Conveyance Systems

Conveyance Systems

Industrial & Commercial

Industrial & Commercial

Power Quality & Measurement

Power Quality & Measurement

Alternative Energy

Alternative Energy

Data Center

Data Center

Utilities

Utilities

FREQUENTLY ASKED QUESTIONS

Voltage / Potential Transformers

None — they are two names for the same device. "Potential transformer" (PT) is the older North American term and "voltage transformer" (VT) is the modern IEC-aligned one. Both describe an instrument transformer that scales system voltage down to a standard measurable level, usually 120 V.
A power transformer is built to deliver energy efficiently. A VT is built to reproduce voltage accurately at a defined burden — its rating is expressed as an accuracy class at a rated VA, not as a power capability. Loading a VT beyond its rated burden degrades accuracy long before it causes any thermal problem.
Add up the VA drawn by everything connected to the secondary — meters, relays, transducers, and the secondary wiring itself — and specify the next standard burden above it. Under-loading is fine; exceeding the rated burden pushes the unit out of its accuracy class. Tell us what you are connecting and we will size it.
No — no minimums and no maximums. We build from a single prototype through full production runs, 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?

  1. 01

    Describe your project. In your own words — give us what you know.

  2. 02

    Answer a few guided questions. We only ask what your quote needs.

  3. 03

    Get your quote. Pricing, lead time, and preliminary drawings — reviewed by an engineer.

Start My Quote No account needed. Free engineering review.