RCTi
Thin, flexible, clip-around, AC current sensor for permanent installation.
The RCTi is typically used with power and harmonic meters and analysers, current meters, oscilloscopes, data-loggers and in power quality applications.




Product Synopsis
RCTi
Thin, flexible, clip-around, AC current probe for permanent installation.
The RCTi is a current sensor for permanent installation.
Simple to install and easy to retrofit, the Rogowski (sense) coil is thin, lightweight, flexible and clip-around. The secondary output from the RCTi is an instantaneous voltage proportional to the measured primary current providing an accurate, low cost, wide-band measurement of the primary current.
RCTi current probes offer:
- Measure AC current only
- Single channel
- 250Arms to 50kArms
- Typical accuracy better than 1%
- 5Vrms (+/-7.07Vpeak) output
- <1 degree phase shift at 50/60Hz to 1kHz
- Abs. Maximum peak di/dt: 6.0kA/µs
- Abs. Maximum rms di/dt: 0.3kA/µs
The RCTi is typically used with power and harmonic meters and analysers, current meters, data-loggers, data acquisition cards, and in power quality applications.
Features
- Traceable calibration (certificate included)
- Non-magnetic materials mean excellent linearity <0.1% reading
- Fully isolated measurement
- Isolated power supply 2kVdc
- 2kV insulated coil
- Small DIN rail enclosure
Standards and Approvals
- CE marked
- Complies with EMC EN61326-1
- Complies with IEC 61010-1; IEC 61010-2-032
- PEM Ltd is certified to the ISO9001:2015 standard
PEM are committed to delivering the highest level of quality to our customers, read more about how we strive to achieve this in our Quality Standards and Compliance sections.
Key Features
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Easy to retro-fit
Lightweight, thin, flexible, clip-around coil for permanent installation.
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Simple to install
Exceptionally easy to install and retro-fit into existing plant.
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Non-intrusive
The device draws no power from the primary circuit.
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Intrinsically safe
No danger of open circuit secondaries.
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Accurate measurements
Accurate power and meter measurements. Small predictable phase error 45/65Hz, equivalent to class 0.5 metering CTs.
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Wide-bandwidth
Wide-band up to 1MHz, to measure harmonic components or complex waveforms (e.g. induction heating, VF drives, power measurement).
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No magnetic saturation
Does not suffer from magnetic saturation.
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Custom cable length
Longer cables than the standard 1m and 2.5m are available on request.
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Custom coil length
Coil lengths longer than the standard 300mm, 500mm, 700mm and 1000mm are available on request.
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Bespoke options
Choose from a range of standard options or create a custom design.
Performance
Technical Specifications
All ranges
- Rated current (rms)
- 250A, 500A, 800A, 1000A, 1600A, 2000A, 2500A, 3000A, 4000A, 5000A, 8000A, 10000A, 16000A, 20000A, 25000A, 30000A, 40000A, 50000A
- Rated output (Full scale FS)
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5.0Vrms (±7.07V peak)
- Output limit
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150% FS (±10.6V peak)
- Supply voltage (Wide input)
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12Vdc (-10%) to 24Vdc (+20%)
- Max. Input power
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0.4W
- Operating temperature range
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–5°C to +65°C (Integrator electronics)
–20°C to +80°C (Coil and cable) - Bandwidth(-3dB) (< 2000A)
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0.6Hz to 1MHz (300mm coil)
600kHz (700mm coil) - Bandwidth (-3dB) (≥ 2000A)
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0.2Hz to 1MHz (300mm coil)
600kHz (700mm coil) - Phase shift @ 50Hz (< 2000A)
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0.9 ± 0.1 degrees
- Phase shift @ 50Hz (≥ 2000A)
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0.4 ± 0.1 degrees
- Accuracy (typ.)
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±1.0% of reading
(5% to 150% FS, 25°C) - Output load
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> 10.0kΩ
- Coil Length
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300mm, 500mm, 700mm or 1000mm
(Longer coils are available on request). - Cable Length
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1m or 2.5m
(Longer cables are available on request).
Dimensions
What is included?
We also offer a range of additional options for each RCT product. Choose from coil and cable lengths, IP65 enclosures, IPX8 Coils and BNC Splitters.
- CE marked
- Complies with EMC EN61326-1
- Complies with IEC 61010-1; IEC 61010-2-032
- PEM Ltd is certified to the ISO9001:2015 standard
PEM are committed to delivering the highest level of quality to our customers, read more about how we strive to achieve this in our Quality Standards and Compliance sections.
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Rogowski Coil
A thin, flexible, lightweight, clip-around (sensing) coil.
(Custom Sizes Available) -
A Connecting Cable
A cable to connect the Rogowski coil to the electronics. (BNC Option Shown).
(Custom cable lengths available on request) -
Din Rail Mount Enclosure
Integrator and signal conditioning electronics housed on a DIN rail mounting enclosure.
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Calibration Certificate
Every unit is supplied with a fully traceable calibration certificate.




Customise & Options
If your requirement is outside that listed on our website please contact us to discuss your requirements and application.
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Longer Coils
Longer Rogowski coils are available up to 5000mm.
(Custom lengths available on request) -
Longer Cables
Longer cables are available up to 50m.
(Custom lengths available on request) -
BNC Cable Split
Isolated BNC to BNC cable split option. BNC to BNC disconnect to allow easy installation of RCT. Plastic touch proof connection for safety.
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IPX8 Rated Rogowski Coil
Weather proofed coil and cable. A flexible current probe based on Rogowski principle, suitable for measurement in combination with portable devices.
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Aluminium IP65 enclosure
An aluminium IP65 die-cast panel enclosure (with improved EMC rejection).
Previously known as IRF.
Get a Quote
Build your RCT product options and complete our online quotation form.
Custom Design
We can provide custom designs for one off applications or volume manufacture.
Downloads
For more information and documents please see our full technical resources area.
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Datasheets
RCTi Datasheet PDF 1.5MB Updated: 3rd October, 2023
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Instruction Sheets
RCTi / RCTi-3ph Instruction Manual PDF 1.2MB Updated: 9th October, 2023
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Dimension Drawings
RCTi / RCTrms Dimensions PDF 203KB Updated: 3rd May, 2024
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Dimension Drawings
RCTi / RCTrms Dimensions (IRF Option) PDF 210KB Updated: 3rd May, 2024
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Dimension Drawings
RCTi / RCTrms Dimensions (BNC Option) PDF 212KB Updated: 3rd May, 2024
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CAD Files
IP65 Aluminium Enclosure STP 2.0MB Updated: 19th December, 2023
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CAD Files
RCTi / RCTrms Enclosure STP 3.6MB Updated: 19th December, 2023
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CAD Files
RCT Coil STEP 3.2MB Updated: 20th October, 2023
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Technical Notes
Current Transformer Comparison PDF 1.2MB Updated: 20th May, 2024
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Technical Notes
RCTi / RCTi-3ph Technical Notes PDF 3.7MB Updated: 9th October, 2023
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Compliance
RCT Warranty PDF 197KB Updated: 9th January, 2025
Quality Standards
We are committed to delivering the highest standards of excellence to customers.
Compliance
We prioritise compliance with industry standards ensuring all products are safe.
Applications
For more information on possible and suitable applications please review the applications below and click each one for further information.
Technical Resources
Browse our extensive resources of technical information, insights and test data.
Get a Quote
Build your RCT product options and complete our online quotation form.