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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 > CURRENT TRANSFORMERS

Custom Current Transformers, Wound to Your Ratio

Pacific Transformer designs and builds custom current transformers wound to your exact ratio, burden, and accuracy class — wound, window, or bar-type. From revenue metering to protective relaying, from a single calibration unit to 10,000+ unit production runs.

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

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Custom current transformers for metering and protection

Wound to Spec

Current Transformers, Wound to Spec

A current transformer steps a large primary current down to a safe, standardized secondary current — typically 5 A or 1 A — so meters, relays, and monitoring equipment can measure it without being connected to the primary circuit. We wind CTs from 5 A up to 5000 A primary, in metering classes (0.3 / 0.6) and protection C-classes, with the burden and frequency your system actually runs at.

Window (donut) type for a conductor you pass through, bar-type with the primary built in, or fully wound for low-current ratios — our engineers spec the right construction for free, and every unit is individually tested and ratio-verified before it ships, not batch-sampled.

Send us your specs
Typical Specifications PTC-CT
Configuration Wound, window (donut) & bar-type
Current Ratios 5 A to 5000 A primary / 5 A or 1 A secondary + custom
Accuracy Class Metering (0.3 / 0.6) & protection (C-class)
Burden 2.5 to 45 VA
Frequency 50 / 60 / 400 Hz
Order Quantity No minimums, no maximums
5000A
Max Primary Current
0.3Class
Metering Accuracy
400Hz
50 / 60 / 400 Hz
0MOQ
No Minimums, No Maximums

Applications

Where Current Transformers Are Used

Anywhere current has to be measured safely and accurately — from the revenue meter to the protective relay to the test bench.

Revenue Metering

Class 0.3 accuracy for billing-grade energy measurement at utility and submetering points.

Protective Relaying

C-class protection CTs that hold ratio through fault currents so relays trip correctly.

Power & Energy Monitoring

Feed PLC, SCADA, and building-management systems with clean, scaled current signals.

Test & Calibration

High-accuracy reference CTs for lab benches, test stands, and calibration fixtures.

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 Flyback Transformers High-frequency designs for switch-mode supplies, EV charging, and industrial electronics. 02 High-Frequency Transformers Compact, low-loss transformers for switch-mode and high-frequency power conversion. 03 Isolation Transformers Galvanically isolated, electrostatically shielded designs for clean, safe power. 04 PDU Transformers Power distribution unit transformers for data centers and critical power. 05 Pulse Transformers Fast-edge pulse transformers for signal coupling, gate drive, and timing. 06 Step-Down Transformers Voltage conversion for machinery, imported equipment, and OEM gear. 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

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

Current Transformers

A current transformer (CT) produces a secondary current proportional to the current flowing in its primary conductor. It scales a large current — hundreds or thousands of amps — down to a standard 5 A or 1 A signal that meters, relays, and monitoring equipment can safely measure.
A window (donut) CT has an opening you pass the existing conductor through, making it the easiest to retrofit. A bar-type CT has the primary conductor built into the unit. A wound CT has an actual multi-turn primary winding, which is how we hit accurate ratios at lower primary currents. We recommend the construction that fits your ratio and mechanical constraints.
Metering classes (0.3 / 0.6) are specified when the CT feeds billing or energy measurement and accuracy at normal load matters most. Protection C-classes are specified when the CT feeds relays and has to stay accurate during fault currents many times rated. Tell us the application and we will spec 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.