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.

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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

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.

Send Us Your Specs

Specs in — a quote back in 24 hours.

Tell us what you're building. A Pacific Transformer applications engineer reviews every request and responds with pricing and lead time — no forms routed to a sales queue.

24HR

Quote turnaround

Pricing and lead time within 24 hours

48HR

Prototype turnaround

A wound, tested prototype in 48 hours

Prefer to talk it through? 800-325-0501

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