RCTi and RCTi 3ph
Clip on Current Sensors

Models 100A to 300,000A for Three phase and single phase systems.
0-10V, 4-20mA, 1A or 5A output

UK Tel: +44 1788 519911
US Tel: +1 631 615 6279
Email : info@powertekus.com
Email : info@powertekuk.com

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The RCTi & RCTrms sensors convert ac current to an isolated 0-5V voltage or 4-20mA current loop. TA5V-5A allows compatibility with existing 1A or 5A CT metering circuits.  Both offer a choice of proportional (rms) and instantaneous outputs. The available RCT current ranges are 0-100A to 0-50,000Apk.  Both RCTi and RCTrms provide accurate measurement over a wide bandwidth ensuring precise measurement even with harmonically distorted wave shapes - using a flexible clip-on sensing coil. The RCTs are available as single and three phase models.

The RCT sensor can provide all popular process control voltage and current loop outputs along with custom output options. Because the current sensors are split core, installation is possible without shutting down the electrical supply - saving down-time costs. Typical applications are retrospective energy monitoring in factories, offices, process control systems like PLC, SCADA Data logging systems, all where power, energy and current monitoring is important.  Typical loading situations are factories, shops, offices, ac/dc VFD drives, ultrasonics, welding, power conversion and power distribution.  For all RCT models, a NIST/NPL (UKAS) traceable calibration certificate and certificate of conformance is supplied. All RCT sensors use UL or CSA approved materials.

    ✓ Available as single or three phase
    ✓ Available sense coil lengths 300, 500 or 700mm
    ✓ Optional mini coils, 3.5mm thickness, 100, 200 or 300mm length
    ✓ Isolated measurement output
    ✓ 0-5V (7.07pk ) into 1kohm or 4-20mA outputs
    ✓ 2kV insulation continuous (tested 4kV) / 10kV optional (tested 15kV)
    ✓ <1% accuracy from 5%-150% of range
    ✓ Bandwidth 0.6Hz to 1MHz
    ✓ Operation to 150% FS 10.6Vpk
    ✓ 12, 24, 48, 125Vdc or 110Vac, 220Vac power supply options, see *
    ✓ Operating range -5C to +65C
    ✓ Safety EN61010:2001
CE marked


series flexible split core current sensors with 0-5V, 1A or 5A outputs,
 allowing installs without shutting down electrical supplies

rct_rms.jpg (35590 bytes)

  RCTi / RCTrms single phase

   RCTi / RCTrms Three phase

rct01.jpg (8652 bytes)

 Includes signal conditioner and power

 Optional 1A or 5A output for RCTi



RCTi single phase  |  RCTrms single phase  |  RCTi3ph Three Phase Sensors  |  RCTi/RCTrms Dimension Drawing


RCTi Metering applications using optional E50 Multi Functional Power Meter

E50 Power Meter Data Sheet and User Guide

The RCTi, RCTi-3ph and RCTrms are ideal for retrofit replacement for medium/large current, split core current transformers operating with transducers. Excellent performance at power frequencies 1Hz to 1MHz, also ideal for VFD drives and induction heating.  The new RCTi and RCTrms current sensor/transducers are suited to permanent or semi permanent installation. The coil sensor is durable, thin, lightweight, flexible and will easily clip-around the conductor. The output from the transducer can be ac voltage (RCTi, RCTi-3ph) or a true rms output (RCTrms).  Typically the RCTi is used with data loggers, oscilloscopes, data acquisition cards, power analyzers, harmonic analysis and in power quality applications.  The RCTrms is used in process control Scada Systems and industrial power applications, where a dc output represents the rms ac current.

For level sensing, alarm and threshold monitoring please see Trip relay

RCTi Models:

RCTi - 100A  RCTi - 5000A
RCTi - 250A RCTi - 8000A
RCTi - 500A RCTi - 10000A
RCTi - 750A RCTi - 15000A
RCTi - 1000A RCTi - 20000A
RCTi - 1500A RCTi - 25000A
RCTi - 2000A RCTi - 40000A
RCTi - 2500A RCTi - 50000A
RCTi - 4000A RCTi - 100000A

Current output options - converting RCTi and RCTi3ph to 1A or 5A current output

The RCT1A current probe has a 1A secondary current output - current sensing is based on a  Flexible Core Loop.   

The RCT1A is a 1A output Flexible current probe.   The TA module is used for interfacing existing RCTi and IRF current probes to existing 1A or 5A metering circuits.  The TA module converts the RCTi/IRF voltage output to 0-1A or 0-5A signal.  Unlike conventional CTs, there are no open circuit hazards, these are ideal with installations in confined spaces.  The RCT1A, RCT/TA5V-5A combination simplifies installation and eliminates the need for expensive LV/HV plant shutdown.
Models from 100/1A to 50000/1A, Accuracy Class 1 (1%) at 5VA. UL/CSA pending

Model RCT1A - Any ratio from 100/1A to 50000/1A

TA5V-5A Rope Type Flexible Current Sensor Specifications

The Powertek TA module can be used with the economic fixed frequency TA current sensors or to convert the wideband RCTi probe voltage output to 0-5A.  In addition, these modules are used to convert any voltage output current measuring device to a 1A or 5A secondary.  Used with standard RCTi & IRF current probes.

Casing: Din Rail module UL94V0 and CSA approved polycarb, 230mm total length
Bandwidth: 20Hz-200Hz (10Hz-50kHz at 1A)
Rating:  5VA
Phase shift: 0.04 at 50/60Hz
Accuracy: <1.0% accuracy
Input impedance: 100kohm
Accurate with waveform crest factors: 1 - 5
Input ranges: 10mV to 10V input
Power: 24Vdc, 110Vac or 230Vac power
Includes: Din Rail, PSU and output CT (5A)

Model TA5V-5A 0-5A output module

Available TA current sensors
100/5A, 200/5A, 300/5A, 400/5A, 500/5A
600/5A, 700/5A, 800/5A, 900/5A, 1000/5A
1200/5A, 1500/5A, 2000/5A, 2500/5A, 3000/5A
4000/5A, 5000/5A, 6000/5A, 8000/5A, 10000/5A

Specify 50, 60 or 400Hz



RCT1A, RCTi & RCTrms Current sensor order codes


RCT1A / range / power supply / coil length mm
1000A range, 1A output with 24Vdc power and 300mm coil length = RCT1A / 1000A / D24 /300   

RCTi / range / power supply / coil length mm
500A range, 0-5V output with 12Vdc power and 300mm coil length = RCTi / 500A / D12 / 300

RCTrms / range / output / power supply / coil length mm
5000A range, 0-5V output with 24Vdc power and 500mm coil length = RCTrms / 5000 / 005 / D24 / 500

RCTi-3ph / range / power supply / coil length mm

2500A range, 0-5V output with 12-24Vdc power and 500mm coil length
RCTi-3ph / 2500 / D24 / 500

RCTi / range / power supply / coil length mm
4000A range, 0-5V output, 24Vdc power and 200mm mini coil length =
RCTi / 4000 / D24 / 200M

<< New >>
Optional 3.5mm diameter 100, 200 or 300mm sense coils

* to meet CE / UL safety requirements, an external power adapter is supplied for 125Vdc, 110Vac and 230Vac options


All products have CE, IEC, EN, ASME or BS approvals.


RCTi single phase  |  RCTrms single phase  |  RCTi3ph Three Phase Sensors  |  RCTi/RCTrms Dimension Drawing

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