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RCTi and RCTi 3ph Clip on Current Sensors

Models 0-100A to 0-300,000A for Three phase and single phase systems. 0.333V, 0-5V, 4-20mA, 1A or 5A output


The RCTi 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 sensors 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 RCTi or three phase RCTi3ph
  • Available sense coil lengths 300, 500 or 700mm
  • 3.5mm or 8mm thick sense coil
  • 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 -5℃ to +65℃
  • Safety EN61010:2001
  • CE marked
RCT series flexible split core current sensors with 0-5V, 1A or 5A outputs, allowing installs without shutting down electrical supplies
rct current sensors
RCTi / RCTrms single phase
rct current sensors
RCTi / RCTrms Three phase
Includes signal conditioner and power
Optional 1A or 5A output for RCTi
RCTi Metering applications using optional E50 Multi Functional Power Meter

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 - 250A
  • RCTi - 500A
  • RCTi - 750A
  • RCTi - 1000A
  • RCTi - 1500A
  • RCTi - 2000A
  • RCTi - 2500A
  • RCTi - 4000A
  • RCTi - 5000A
  • RCTi - 8000A
  • RCTi - 10000A
  • RCTi - 15000A
  • RCTi - 20000A
  • RCTi - 25000A
  • RCTi - 40000A
  • RCTi - 50000A
  • RCTi - 100000A
Current output options - converting RCTi and RCTi3ph to 1A or 5A current output

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

For more information on the RCT1A please click here

NEW COMPACT - ALL IN ONE WITH 1A OUTPUT Model RCT1A - Any ratio from 100/1A to 50000/1A

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 and thickness

4000A range, 0-5V output, 24Vdc power and 200mm 3.5mm mini coil (M) length = RCTi / 4000 / D24 / 200M


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