CTA flexible current transformers with 5A output

5VA rated output drives long cables up to 50ft/15.2m
Models from 100A to 10,000A for Three Phase and Single Phase systems with 5A output

UK Tel: +44 1788 519911
US Tel: +1 631 913 3242
Email : info@powertekus.com
Email : info@powertekuk.com

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CTA flexible "rope-type" current transformer, sensing current from 100A to 10,000A with 5A secondary
Capable of driving 50ft of 16 AWG cable
Capable of driving 32ft of 18 AWG cable
Not frequency sensitive

Click here for CTA Datasheet

CTA Conditioner and 5A output module

The CTA flexible current transformers are the world's first flexible 'clip-on' current probe with a 5A output, allowing compatibility to existing 5A metering circuits.  Unlike conventional CTs, there are no open circuit hazards - ideal for retrospective metering projects and installations in confined spaces where installation of conventional iron core CTs is not possible.  The CTA flexible current sensor also simplifies installation and eliminates the need for expensive LV/HV plant shutdown.  In addition, these modules are used to convert any voltage output current measuring device to a 1A or 5A secondary.

The CTA flexible current transformers convert ac current to an isolated 0-5A current with available ranges from 100A to 10,000A.  Because the current sensors are flexible split core, installation is possible without shutting down the LV electrical supply, avoiding expensive down-time costs. Typical applications are retrospective energy monitoring in factories, offices buildings, process control data logging systems, where power, energy and current monitoring is important.  Typical applications are factories, offices buildings, ac/dc VFD drives, welding, power conversion and power distribution.  For all CTA current sensor models, a NIST/NPL (UKAS) traceable calibration certificate and certificate of conformance is supplied. All CTA sensors use UL94V0 or CSA approved materials.  
The CTA flexible current sensors are suited to permanent or semi permanent installation. The coil sensor is durable, lightweight, flexible and will easily clip-around a power cable. The 5A output from the CTA current sensor connects direct to installed metering, rotary metering or current transducers.

Suitable for single or three phase systems


Available sense coil diameters 100mm, 150mm, 200mm, 300mm


Isolated measurement output


0-5Arms metering compatible output at 5VA (0.2 ohm burden max)


1kV insulation continuous (tested 7.4kV)


<0.5% accuracy


Flat frequency response from 25Hz to 500Hz


110Vac-240Vac power standard, optional 24Vdc, 48Vdc or 125Vdc


Operating range -20C to +65C


Safety EN61010-1 1000Vac CATIII, 600Vac CATIV CE marked, UL94V0 flame retardant

CTA Metering applications

E50 Power Meter Data Sheet and User Guide

CTA Models and order codes



CTA/100/5A/2/100 CTA/1600/5A/2/100
CTA/200/5A/2/100 CTA/1800/5A/2/100
CTA/300/5A/2/100 CTA/2000/5A/2/100
CTA/400/5A/2/100 CTA/2500/5A/2/100
CTA/500/5A/2/100 CTA/3000/5A/2/100
CTA/600/5A/2/100 CTA/3500/5A/2/100
CTA/700/5A/2/100 CTA/4000/5A/2/100
CTA/800/5A/2/100 CTA/5000/5A/2/100
CTA/900/5A/2/100 CTA/6000/5A/2/100
CTA/1000/5A/2/100 CTA/7000/5A/2/100
CTA/1200/5A/2/100 CTA/8000/5A/2/100
CTA/1500/5A/2/100 CTA/10000/5A/2/100

CTA / Arms current / 5A output / cable length / coil diameter mm

Optional voltage input version TA5V-TA

CTA specifications

CTA 5A output "Rope Type" Flexible Current Sensor Specifications

The Powertek CTA flexible sensor & conditioning module are supplied as calibrated sets with a traceable calibrated 0-5Arms output.  In addition, these modules can be configured to convert any voltage output current measuring device to a 1A or 5A secondary. 

Current Sense coil
Diameter: 100mm/3.93" or 160mm / 6.3" clip-around split core construction
Thickness: 8mm / 0.31"
Material: Flexible Thermoplastic rubber, flame retardant UL94V0
Working voltage: 1000V at 50/60Hz CAT III, tested 7400V 50/60Hz 1 minute

1000V UL style 20940, 5mm dia, 3metre length

Casing: Din Rail module UL94V0 and CSA approved polycarb, 250mm total length
Fundamental Frequency: 20Hz to 500Hz
Bandwidth: 20Hz-2500Hz
Output rating: 5VA (0.2 ohm burden)
Phase shift: 0.04 at 50/60/400Hz
Accuracy: <1.0% accuracy
Input impedance: 100kohm
Accurate with waveform crest factors: 1 - 5
Input ranges: From 0-100A to 0-10,000Arms
Power: 110Vac-240Vac power, optional 24Vdc, 48Vdc and 125Vdc
Includes: Din Rail, PSU and output CT (5A)

Operational range -
20C to +65C

Model CTA5V-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, 1600/5A, 1800/5A, 2000/5A
2500/5A, 3000/5A, 3500/5A, 4000/5A, 5000/5A
6000/5A, 7000/5A, 8000/5A, 10000/5A

Specify 50Hz, 60Hz or 400Hz


Available sensor styles from 100mm to 300mm dia


Click here for CTA Datasheet

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

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