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PCTi3ph 3 phase Clip-on split core current sensors - current probes

Models 0-100A to 0-500,000A for Three phase and single phase systems. 0.333V, 0-5V, 4-20mA, 1A or 5A outputs


The PCTi3ph three phase current sensors convert ac current to an isolated 0-5V voltage or 4-20mA current loop. Option TA5V-5A allows PCTi3ph's compatibility with existing 1A or 5A CT metering circuits. Both offer a choice of proportional (rms) and instantaneous outputs. The available PCTi current ranges are 0-100A to 0-500,000Apk. Both PCTi and PCTrms provide accurate measurement over a wide bandwidth ensuring precise measurement even with harmonically distorted wave shapes - using a flexible clip-on sensing coil. The PCTi3ph are available as single and three phase.

The PCTi3ph 3 phase current 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 and expensive busbar / cable reconfiguration. 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 PCTi models, a NIST/NPL (UKAS) traceable calibration certificate and certificate of conformance is supplied. All PCTi sensors use UL or CSA approved materials.

  • Ideal for energy metering retrofit
  • Available as single phase PCTi1ph or three phase PCTi3ph
  • Available sense coil lengths 300, 500 or 700mm
  • 3.5mm or 8mm thick sense coils
  • Isolated measurement output
  • 0-5V (7.07Vpk) 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
PCTi3ph series flexible split core current sensors with 0-5V, 1A or 5A outputs, allowing installs without shutting down electrical supplies
rct current sensors
PCTi3ph / PCTrms3ph three phase
PCTi3ph current sensors
PCTi3ph / PCTrms3ph Three phase
PCTi3ph 3 phase current transducer
Includes signal conditioner and power
PCTi3ph 3 phase current sensor
Optional 1A or 5A output for PCTi3ph
PCTi3ph Metering applications using a Multi Functional Power Transducer Meter

The PCTi3ph and PCTrms3ph are ideal current probes when retrofitting energy meters for LV or MV systems, these split core current transformers are supplied with signal conditioner / transducers. Excellent performance at power frequencies, including harmonics up to 1MHz. Also ideal for VFD drives and induction heating applications. The new PCTi3ph and PCTrms3ph current sensing 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 (PCTi3ph) or a true rms output (PCTrms3ph). Typically the PCTi3ph is used with energy meters, data loggers, power analyzers, harmonic analysis and in power quality applications. The PCTrms3ph 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

PCTi3ph Models:
  • PCTi3ph - 100A
  • PCTi3ph - 250A
  • PCTi3ph - 500A
  • PCTi3ph - 750A
  • PCTi3ph - 1000A
  • PCTi3ph - 1500A
  • PCTi3ph - 2000A
  • PCTi3ph - 2500A
  • PCTi3ph - 4000A
  • PCTi3ph - 5000A
  • PCTi3ph - 8000A
  • PCTi3ph - 10000A
  • PCTi3ph - 15000A
  • PCTi3ph - 20000A
  • PCTi3ph - 25000A
  • PCTi3ph - 40000A
  • PCTi3ph - 50000A
  • PCTi3ph - 100000A
Current output options - converting PCTi3ph 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 type current probe. The TA5V-5A module is used for interfacing existing PCTi3ph and IRF current probes to existing 1A or 5A metering circuits. The TA5V-5A module converts the PCTi3ph and 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, PCTi3ph and TA5V-5A combination simplifies installation and eliminates the need for expensive bus/feeder reconfiguration or 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 CTA3ph 5A module can be used with its own economic CTA current sensors, the TA5V-5A module converts the wideband PCTi3ph probe voltage output to 0-5A.  In addition, the TA modules are used to convert any voltage output current measuring device to a 1A or 5A secondary.  typically used with standard PCTi3ph & 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 CTA1ph and CTA3ph 0-5A output modules

Available CTA1ph and CTA3ph 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, PCTi3ph & PCTrms3ph 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

PCTi3ph / range / power supply / coil length mm

500A range, 0-5V output with 12Vdc power and 300mm coil length = PCTi3ph / 500A / D12 / 300

PCTrms3ph / range / output / power supply / coil length mm

5000A range, 0-5V output with 24Vdc power and 500mm coil length = PCTrms3ph / 5000 / 005 / D24 / 500

PCTi3ph / range / power supply / coil length mm

2500A range, 0-5V output with 12-24Vdc power and 500mm coil length = PCTi3ph / 2500 / D24 / 500

PCTi3ph / range / power supply / coil length and thickness

4000A range, 0-5V output, 24Vdc power and 200mm 3.5mm mini coil (M) length = PCTi3ph / 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