CTRC Rogowski Coil


    • 188.75 $
    • 29.12 $
    One power supply can power up to 12 conditioning modules


The CTRC series flexible Rogowski coil current transformer can measure AC line current in circuits up to 600 Vac and nominal currents up to 6000 Amps. They open up for easy installation around bus bars and multiple parallel conductors. CTRC Rogowski coils offer excellent linearity, low phase angle error, with window diameters of 3.1,  4.5,  7.5, or 12 inches, with rated currents from 250 to 6000 amps.

Easier AC Current Measurement

The CTRC Rogowski coil current transformers are accurate, flexible, rope-like current sensors that can be connected around conductors. They greatly simplify AC current measurements of conductors where traditional split-core and solid-core CTs are difficult to use. With its flexible design, the CTRC is perfect for large bus bars and irregular-shaped conductor bundles. In addition, the coil’s small profile allows it to fit into tight spaces where rigid CTs won’t fit.

Fully Compatible with WattNode® Meters

Sold individually, the CTRC coils can be used for single-phase and three-phase services. The output of the CTRC’s flexible coil is connected to a conditioning circuit, where it is converted to a safe 0.333 Vac low-voltage  signal which is compatible with WattNode meters.

Complete Solution

Four standard models are offered covering various conductor sizes and current ranges from 250 A to 6000 A. Non-standard currents ranges and window openings are available as custom orders. CTRC Rogowski coils are supplied with conditioning circuit pre-wire to coil and standard 8 ft. (2.4 m) black and white CT wires for connection to the WattNode meter.

  • Safe: 0.333 Vac output at rated full scale current—no need for shorting blocks!
  • Low phase angle error: essential for accurate power and energy measurements
  • Approvals: UL Recognized, CE Mark, RoHS


Limited 5 year warranty. See manual for details.



  • Type: Flexible Rogowski coil current transformer with conditioning circuit


  • Output wires: 8 feet (2.4 m), 22 AWG, white / black twisted
    • May be extended to 100 feet (30 m)
  • Frequency: 50/60 Hz nominal
  • Maximum voltage: 600 Vac
  • Maximum safe amperage: >10,000A. Unlike conventional CTs, Rogowski coil CTs have negligible secondary current (typically less than one microamp) and very low secondary voltages (typically less than 100 mVac), so even during extreme overcurrent, the secondary voltage, current, and power dissipation will all be very low.
  • Measurement category: CAT III, 600 Vac
  • UL recognized: file number E344623 (PICQ2), UL standard 61010B-1


All measurements at 77°F (25°C) and 60 Hz unless otherwise noted.

  • Accuracy: ±1.0% of reading from 5% to 120% of rated primary current
  • Conductor position sensitivity: Additional error due to the location of the conductor within the coil


CTRC-03100No added error±1.5%±5.0%
CTRC-04500No added error±1.0%±4.0%
CTRC-07500No added error±1.0%±4.0%
CTRC-12000No added error±1.0%±3.0%
  • External conductor sensitivity: ±2.0% of full-scale maximum (to clarify, if an external conductor carrying this CT’s rated current is just touching this CT, then the output of this CT may change by up to ±2.0% of the rated current)
    • CTRC-03100 models only: ±2.5% of full-scale maximum
  • Positioned at corner: ±1.0% maximum (if the CT is installed at a sharp bend of the conductor being measured)
    • CTRC-03100 models only: ±2.0% maximum
  • Additional error due temperature variation: ±1.5% from -4°F to 140°F (-20°C to 60°C)

Phase Angle

  • Phase angle: ±0.50 degrees (30 minutes) from 5% to 120% of rated current
  • Conductor position sensitivity: ±0.10 degrees max
  • External conductor sensitivity: ±0.25 degrees max
  • Positioned in corner: ±0.10 degrees maximum
  • Varying temperature: -4°F to 140°F (-20°C to 60°C): ±0.10 degrees

Conditioning Circuit

  • Output at rated amps: 0.333 Vac (one-third volt)
  • Maximum output: 1.3 Vac
  • Power requirements: 10 – 30 AC/DC (12 Vdc or 24 Vdc recommended), 50 mA typical, 70 mA maximum


  • Operating temperature: -4°F to 140°F (–20°C to 60°C)
  • Operating humidity: Non-condensing, 5 to 90% relative humidity (RH)
  • Pollution: POLLUTION DEGREE 2
  • Indoor use: Suitable for indoor use.
  • Outdoor use: Suitable for outdoor use when mounted in a NEMA 3R or 4 (IP 66) rated enclosure.



CTRC-03100-02502503.15″ (8.0 cm)$188.75 each
CTRC-03100-04004003.15″ (8.0 cm)$171.60 each
CTRC-03100-06006003.15″ (8.0 cm)$188.75 each
CTRC-03100-100010003.15″ (8.0 cm)$188.75 each
CTRC-04500-100010004.5″ (11.4 cm)$176.80 each
CTRC-04500-160016004.5″ (11.4 cm)$194.48 each
CTRC-04500-200020004.5″ (11.4 cm)$194.48 each
CTRC-07500-100010007.5″ (19.0 cm)$200.21  each
CTRC-07500-160016007.5″ (19.0 cm)$200.21 each
CTRC-07500-200020007.5″ (19.0 cm)$182.00 each
CTRC-07500-320032007.5″ (19.0 cm)$200.21 each
CTRC-07500-400040007.5″ (19.0 cm)$200.21 each
CTRC-12000-2000200012.0″ (30.5 cm)$227.66 each
CTRC-12000-3200320012.0″ (30.5 cm)$227.66 each
CTRC-12000-4000400012.0″ (30.5 cm)$206.96 each
CTRC-12000-5000500012.0″ (30.5 cm)$227.66 each
CTRC-12000-6000600012.0″ (30.5 cm)$227.66 each


CTRC Rogowski Coil

Brochure, Manual, and Application Notes