Current Sensors

A current transformer is a device used to measure the amount of electricity flowing through a wire. It works by wrapping a wire around the main electrical wire, creating a magnetic field that corresponds to the amount of electricity flowing through the main wire. This magnetic field is then read by a measuring device, which tells you how much electricity is flowing.

We have both Donut and Split-style Current Transformers depending on installation preference.

Donut-Style Current Transformers

The “donut” style CT requires the branch circuit wire to be disconnected in order to thread it through the center of the CT. Although it requires more labor for installation, the donut CT is lower cost and takes less space in the panel.

Micro-40

  • Max breaker: 40A (30A aluminum wire)
  • Max volt: 300V
  • Accuracy: typically better than 1.5%
  • Lead length: 6 1/2 ft (2 meters)
  • Certification: UL/c

Micro-80

  • Max breaker: 80A
  • Max volt: 300V (600V Micro-80-i available)
  • Accuracy: typically better than 1.5%
  • Lead length: 5 ft (1.5 meters)
  • Certification: UL/c

Micro-100

  • Max breaker: 100A
  • Max volt: 300V
  • Accuracy: 1%
  • Lead length: 5 ft (1.5 meters)
  • Certification: UL/c

Split-Core Current Transformer

The “split-core” style CT doesn’t require any wire disconnection. Although the installation is simpler and quicker that donut CTs, the split-core CTs are more expensive.

SPLIT-30

  • Max breaker: 30A (20A aluminum wire)
  • Max volt: 300V
  • Accuracy: typically better than 2%
  • Lead length:
  • Certification: UL/c

SPLIT-60

  • Max breaker: 60A
  • Max volt: 600V
  • Accuracy: 1%
  • Lead length: 6 ft (1.8 meters)
  • Certification: UL/c

SPLIT-100

  • Max breaker: 100A
  • Max volt: 300V
  • Accuracy: 1%
  • Lead length: 5 ft (1.5 meters)
  • Certification: UL/c

SPLIT-200

  • Max breaker: 200A
  • Max volt: 300V
  • Accuracy: 1%
  • Lead length: 9.8 ft (3 meters)
  • Certification: UL/c

SPLIT-400/600

  • Max breaker: 600A
  • Max volt: 600V
  • Accuracy: 0.5% from 5A
  • Lead length:
  • Certification: UL/c
Brultech Research Inc.