Family-owned & American-made since 1981 · Easton, Pennsylvania
Magnetics & Controls, Inc. Current Transformer Specialists

Circuit Breaker Retrofit Current Transformers

Drop-in replacement CTs for breaker retrofit and life-extension projects — including obsolete and discontinued units other suppliers won't touch.

Built to keep your project moving

When the original CT is gone, we rebuild it.

Breaker retrofit and switchgear life-extension projects live or die on parts availability. When a current transformer is obsolete, discontinued, or carries a year-long lead time, the whole job stalls.

Magnetics & Controls reverse-engineers and rebuilds retrofit CTs to match the original's fit, form, and function — built to print in the USA, so a single unavailable part no longer holds up an entire breaker.

Lead Time
Quick-Turn
Minimum
1 piece
Obsolete Parts
Reverse-engineered
Origin
Made in USA
Why retrofit teams call us

The replacement CT, without the wait.

🔧

Obsolete & Discontinued

We reverse-engineer CTs no longer made by the original manufacturer and rebuild them to match.

📐

Built to Print

Matched to the original's dimensions, ratio, accuracy, and mounting so it drops straight in.

Quick-Turn, No Minimums

One unit or a batch — made in the USA on a timeline measured in weeks, not seasons.

Primary Current
0.1 – 20,000 A
Secondary
0.001 – 10 A
Accuracy
0.1% – 2.4%
Burden
to 8000 VA
Specifications

Matched to your original unit.

We work from your drawing, datasheet, sample part, or an obsolete part number, and reverse-engineer to the original spec — typically at no charge, with any exception quoted up front before work begins.

If we've built your unit before and fabricate its components in-house, a same- or next-business-day quote is often possible. Retrofitting a fleet? We can also private-label the same CT across a production run.

  • Round, square, rectangular or oval window
  • Multiple primary & secondary ranges
  • Varnish-impregnated or fully encapsulated
  • Leads or terminals to match the original

Have an obsolete CT holding up a retrofit?

Send us the part number, a drawing, or the unit itself. We'll tell you quickly whether we can reverse-engineer and rebuild it — and when you'll have it.

Request a Quote →