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Standard Current Transformers
Standard and custom toroidal current-sensing (instrument) transformers for accurate measurement and protection.
Overview
Standard and Custom Design Toroidal Current-Sensing Transformers
Toroidal Current-Sensing (Instrument) Transformers
Bridgeport Magnetics manufactures high-precision toroidal current-sensing transformers designed to accurately measure current flowing through power lines and bus bars with excellent linearity and reliability.
Our compact toroidal CTs can be supplied with protective insulation via taping, resin dipping, or epoxy potting. For maximum durability they are also available fully cast and encapsulated in epoxy – as individual units or grouped multi-phase assemblies.
Key Advantages
- Ultra-compact toroidal core delivers the smallest footprint in the industry – as small as 2.50″ OD × 1.00″ HT for maximum space savings in tight panels and equipment
- Superior accuracy and linearity thanks to the uniform magnetic field and zero air gaps
- Extremely low VA burden – starts at just 1.0 VA for better metering performance and longer secondary cable runs
- Minimal electromagnetic interference (EMI) and stray fields due to the closed-loop toroidal construction
- Flexible finishing options – tape, resin dip, epoxy potting, or full epoxy casting (single or multi-phase)
- Broad standard line plus custom designs built exactly to your specifications
- Made in the USA – consistent quality, Buy-American eligibility, and direct engineering support
Voltage Generating Types
Electronic power monitoring equipment sometimes relies on a current transformer to produce a voltage signal. This is accomplished with a relatively high turns ratio (typically 1000 to 2000) with a load resistor mounted across the winding. This type of current transformer is often mounted directly onto a PC board. Besides flying leads, we can supply the transformer mounted vertically or horizontally in a carrier with pins for PC mount.
Specifications
| P/N | Current Ratio | VA Burden (Examples) | Percent Accuracy | Finished Dimensions (OD x HT) |
|---|---|---|---|---|
| 0050-CTR | 50:5 | 1.0 | 2 | 2.50 x 1.00 in |
| 0075-CTR | 75:5 | 1.0 | 2 | 2.50 x 1.00 in |
| 0100-CTR | 100:5 | 2.0 | 2 | 2.50 x 1.00 in |
| 0200-CTR | 200:5 | 5.0 | 1 | 3.65 x 1.15 in |
| 0300-CTR | 300:5 | 12.5 | 1 | 3.65 x 1.15 in |
| 0400-CTR | 400:5 | 12.5 | 1 | 3.65 x 1.15 in |
| 0500-CTR | 500:5 | 25.0 | 1 | 4.10 x 1.25 in |
Let's build yours to spec.
Custom magnetics engineered and manufactured in the USA. Tell us your requirements and our engineers will help.