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The CTHR sensors convert dc+ac and ac current to an isolated voltage or mA output proportional to the RMS.   All popular process control voltage and current loop outputs are available, along with optional RS485/RS422, Ethernet or Wifi.  Through hole or split core options mean that connection is non-intrusive and straightforward.  The available input range of the CTHR current sensors is from 1A to 40,000A. Optional dc offset control allows nulling of residual dc current to ensure best use of the output span.  The current sensor power input is designed to operate over a wide voltage range associated with process control and sub-station auxiliary dc supply systems.  Active Hall Effect sensor technology allows measurement from DC-150kHz (depending on the sensor type).  The CTH Models can be used to provide an instantaneous output for ac currents.  Typical applications are found in process control systems like PLC or SCADA, transportation, telecommunications, dc drives, welding and circuit breaker trip coils.  For all CTHR models, an NIST/NPL (UKAS) factory traceable calibration certificate or ISO9001 compliant certificate of conformance is supplied.

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

CTHR through hole core Type 1

  • Type 1: Hole: 13.5mm (0.53") x 10mm (0.39")
  • Overall size 145mm (5.71") x 95mm (3.74") x 38mm (1.50").
  • Type 1 current ranges: 1A / 2A / 5A / 10A / 20A / 30A /
    40A / 50A / 75A / 100Apk

Type 6: DC-10kHz Type 7: DC-4kHz (internal filter 1500Hz). As
standard the sensor is supplied connected via a 30cm (12" cable)

CTHR Type 2

  • Type 2 current ranges: From 0-5A to 0-600Apk, 25.5mm dia

Type 2 - 24.5mm through hole DC-150kHz (internal filter 1500Hz)
As standard the sensor is supplied connected via a 30cm (12" cable)

CTHR split core Type 3a

  • Hole diameter 16mm (0.63") Overall size 40.5mm (1.59") x 67mm (2.64") x 36.5mm (1.44")
  • Current ranges: 5A / 10A / 20A / 50A / 100A / 150Arms
  • 24Vdc Loop Powered

 

CTHR Type 3a split core AC sensor 50/60Hz
Type 3a Datasheet

CTHR split core Type 5

  • Hole diameter 21mm (0.83") Overall size 204mm
    (8.03") x 65mm (2.55") x 38mm (1.5")
  • Current ranges: 20A / 30A / 40A / 50A / 100A / 200A
    / 300A / 400Apk split core models.

Type 5 split core DC-25kHz (internal filter 1500Hz).
As standard the sensor is supplied connected via a 90cm (36" cable)

CTHR split core Type 6 / CTHR split core Type 7

CTHR split core Type 6
  • Hole: 104 (4.09") x 40mm (1.57") Outer: 159mm (6.26") x
    85mm (3.35") Current ranges: From 200A to 4000Apk
CTHR split core Type 7
  • Hole: 163mm (6.42") x 50mm (2")Outer: 233mm (9.17") x
    95mm (3.74") Current ranges: From 500A to 4000Apk

Type 6: DC-10kHz Type 7: DC-4kHz (internal filter 1500Hz).
As standard the sensor is supplied connected via a 30cm (12" cable)

CTHR Type 4 mini and CTHR split core Type 8 mini

  • Hole: 28.5mm (1.125") round hole.
  • Outer: 102 mm (4") x 80mm (3.125") x 19mm (0.75")
  • Current ranges: 100 / 200 / 300 / 400Apk

Type 8 mini split core DC-400Hz

CTHR Type 4 and CTHR split core Type 8

  • Hole: 50mm (2") round hole Outer: 127mm (5") x
    105mm (4.125") x 31.75mm (1.25")
  • Current ranges: CTHR / 200 / 300 / 400 / 500 / 800 /
    1000 / 1500 / 2000 / 2500A / 5000Apk

Type 8 split core DC-400Hz

CTHR Type 9z

  • Hole: 115mm x 33mm (4.5" x 1.25") rectangular hole
  • Outer: 199mm x (7.83") x 99mm (3.90") x 34mm (1.34")
  • Current ranges: CTHR / 200 / 300 / 400 / 500 / 800 /
    1000 / 1500 / 2000 / 2500A / 3000Apk

Type 9z split core DC-400Hz

Type 9z with extended cable

CTHR Type 8F

  • Hole: 57mm (2.25") round hole Outer: 137mm
    (5.375") x 134mm (5.25") x 42.00mm (1.625")
  • Current ranges: CTHR / 200 / 300 / 400 / 500 / 800 /
    1000 / 1500 / 2000 / 2500A / 5000Apk

Type 8F split core DC-400Hz

CTHR Type 8EE

  • Hole: 108mm (4.25") round hole
  • Outer: 184mm (7.25") x 159mm (6.25") x 42.00mm (1.625")
  • Current ranges: CTHR / 200 / 300 / 400 / 500 / 800 /
    1000 / 1500 / 2000 / 2500A / 5000Apk

Type 8EE split core DC-400Hz

CTHR Type EE terminals on sensor head

  • Hole: 108mm (4.25") round hole
  • Outer: 184mm (7.25") x 159mm (6.25") x 42.00mm (1.625")
  • Current ranges: CTHR / 200 / 300 / 400 / 500 / 800 / 1000 /
    1500 / 2000 / 2500A / 5000Apk

CTHR Type EE Datasheet

CTHR Type D split core terminals on sensor head

  • Hole: 28.5mm (1.125") round hole.
  • Outer: 116.59mm (4.59") x 73.4mm (3.125") x 19mm (0.75")
  • Current ranges: 100 / 200 / 300 / 400A / 500Apk

CTHR Type D Datasheet

CTHR split core Type G

  • CTHR Hole size 88.9mm (3.5") x 165.1mm (6.5").
  • Outer 196.85mm (7.75") x 304.8mm (12")
  • Current ranges 1000A / 2000A / 3000A / 4000A / 5000A / 6000Apk

CTHR Type G Datasheet

CTHR split core Type 10

CTHR split core Type 10
  • CTHR Hole size 140mm (5.5") x 203mm (8"). Outer 254 (10") x 350 (13.75")
  • Current ranges 5000A / 6000A / 7000A / 8000A / 9000A /
    10000A / 15000A / 20000Apk
CTHR split core Type 11
  • CTHR aperture 330mm (13") x 330mm (13"). Outer 534mm
    (21") x 534mm (21")
  • Current ranges 25000A / 30000A / 35000A / 40000Apk

Type 10 & 11 split core DC-1kHz

ISCTHR Type 8 ATEX and UL approved for Intrinsically safe environments

  • 50mm (2") round hole Outer: 127mm (5") x 105mm (4.125") x 31.75mm (1.25")
  • Current ranges: CTHR / 100 / 200 / 300 / 400 / 500 / 800 / 1000 / 1500 / 2000 / 2500Apk

Model ISCTHR type 8 intrinsically safe, models from 100A to 2500A

ISCTHR datasheet

Molded integral cable for intrinsically safe connection

CTLP Loop powered dc current transducer

  • Current ranges: CTLP 25 / 50 / 100 / 400 / 500 / 600 / 800 / 1000 / 1500 / 2000 / 3000Apk

CTLP case A models 25A, 50A and 100A

CTLP case Z models 400A, 500A, 600A, 800A, 1000A,
1500A, 2000A and 3000Apk

CTLP datasheet

CTHR Signal conditioner terminal connections

Terminals from left to right:
output + / output - / power input ground -ve / power input positive +ve

Input and output grounds are isolated 250Vdc

Signal conditioner overall size 145mm (5.71") x 65mm (2.56") x 38mm (1.50")

AC/DC current transducer general specifications

Ranges Depending on core type: 1A / 2A / 5A / 10A / 20A / 30A / 40A / 50A / 100A / 200A / 500A / 1000A / 2000A / 3000A / 4000A / 5000A / 6000A / 10000A / 20000A / 25000A / 30000A / 35000A / 40000A Amps peak
Outputs 0-100mV, 0-1V, 0-2V, 0-5V, 0-10V, 0-20mA, 4-20mA or 5-25mA outputs.  All CTHR outputs represent Arms. Non-standard outputs are available.  Optional RS485/RS422, Ethernet or Wifi.
Core type Through hole or split core clamp type, based on dc Hall Effect sensing
Insulation voltage rating Type 1, 2 & 5 rated insulation (Galvanic) 2.5kVpk 1 min 50/60Hz. Type 6 & 7 3kVpk 1 min 50/60Hz. Type 4, 8, 8EE 5kVpk 1 min 50/60Hz
Power input 5Vdc / 12Vdc / 24Vdc / wide range 9-36Vdc / 48Vdc / 72Vdc / 110Vdc / 125Vdc / 250Vdc / 115Vac / 230Vac - all fuse, polarity and surge protected
Accuracy 0.5% for a non split core, 1.0% for a split core. Conditions +23C 5C, traceable to UKAS NPL/NIST USA
Working temperature range Typically -20C - 65C (can be extended, check for exact model). Functional temperature range –20C - 70C (check for each model). CTHR types 1 & 2 are –40C - 85C (sensor head only)
Protection Input fuse, output fuse, reverse power input protection, spike suppression
Frequency response Depending on sensor type/model. Type 1 & 2 DC- 150kHz max. Type 5, 6, 7, are DC-10kHz, Type 8, 8maxi, EE, 8EE, 8F, 9z, G split cores are DC-400Hz max. Standard HF cut-off filter is 1.5kHz (other values available)
Adjustment Internal dc offset and gain controls
Mounting All signal conditioners and sensors have fixing points. Current sensors up to 600Apk can be mounted on the signal conditioner case or via a cable.
Approvals CE Marked, IEC1010 cat II & IEC348, UL/CSA rated materials. Self extinguishing materials to UL94V0
Warranty 2 year warranty

Available through hole sizes (some not pictured above)

  • Type 1: 13.5 x 10mm rectangular 1A – 100A – Supplied attached or separate to conditioner
  • Type 2: 24.5mm diameter 5A - 600A – supplied with 1 metre (39") from sensor - signal conditioner
  • Type 4 mini: 28.5mm / 1.125" diameter 100A - 400A Sensor has integral signal conditioner supplied with 2.4M cable
  • Type 4: 50mm diameter / 2" diameter 100A - 3000A Sensor has integral signal conditioner supplied with 2.4M cable

Available split core hole sizes

  • Type 5: 21mm dia 20A - 400A supplied with 1 metre (39") cable from sensor - signal conditioner
  • Type 6: 104 x 40mm 500A - 3000A supplied with 1 metre (39") cable from sensor - signal conditioner
  • Type 7: 163 x 50mm 500A - 4000A supplied with 1 metre (39") cable from sensor - signal conditioner
  • Type 8 mini: 28.5mm / 1.125" dia 100A - 400A Sensor has integral signal conditioner supplied with 2.4M cable
  • Type 8: 50mm / 2" dia 100A - 5000A Sensor has integral signal conditioner supplied with 2.4M cable
  • Type 8F (maxi): 57.15mm / 2.25" dia 400A - 5000A Sensor has integral signal conditioner supplied with 2.4M cable
  • Type EE: 108.00mm / 4.25" dia 400A - 5000A Sensor has integral signal conditioner supplied with terminals
  • Type 8EE: 108.00mm / 4.25" dia 400A - 5000A Sensor has integral signal conditioner supplied with 2.4M cable
  • Type 9z: 115mm (4.5") x 33mm (1.25") 200A - 3000A Sensor connects to signal conditioner via 2.4M cable
  • Type G: 88.9mm (3.5") x 165.1mm (6.5") 2500A - 6000A Sensor has integral signal conditioner supplied with 2.4M cable
  • Type 10: 140mm (5.5") x 203mm (8") 5000A - 20000A Sensor connects to signal conditioner via 2.4M cable
  • Type 11: 330mm (13") x 330mm (13") 25000A - 40000Adc Sensor connects to signal conditioner via 2.4M cable
  • Longer cable lengths available - on request

Current transducer order codes

  • The order code is based on:-
  • CTHR / amps input / output / SC or TH / power input + core type
  • SC = split core, TH = through hole (non-split core)
  • 230Vac/dc & 115Vac/dc adapters are available (in this case the CTHR will be supplied with 9-36Vdc input and ac adapter)
  • Options - Environmental
  • All models self extinguishing materials to UL94V0 and CSA
  • Extended temperature range -40C - 85C (not available for all sensor types)
  • Options – noise rejection and offset
  • Non standard input current
  • Non standard output voltage or current
  • User can specify upper or lower –3db point

Order code examples

CTHR / 50A / 4-20 / TH / 24Vdc type 1 50Adc input, 4-20mA output, through hole, 24V aux power input, core type 1 (13.5 x 10mm)
CTHR / 400A / 10 / TH / 72Vdc type 4 400Adc input, 0-10V output, through hole, 72Vdc aux power input core type 4 (50mm hole dia)
CTHR / 2000A / 10 / SC / 110Vdc type 7 2000Adc input, 0-10V output, split core, 110Vdc aux power input, type 7 core (163 x 50mm)