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AC Current Sensors for Industrial, Automation, Rail Transport, Welders, DCS and Electric Vehicles

Converting AC current to an isolated voltage or current loop. The CTHR conditioner is ideal to provide power and conditioning for LEM Hall current sensors. Optional interfaces

The CTHR AC current sensors convert AC and dc+ac current to an isolated voltage or mA output with fast response and precision.

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AC current sensor, CTHR type 1 AC current probe
AC current sensor, CTHR type 1

Compact Current sensor - CTHR Type 1

Type 1: AC-100kHz (internal filter 1500Hz). As standard the sensor is supplied connected via a 100cm (39") cable
  • 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: 0-1A up to 0-100A, DC-100kHz
AC current sensing transducers, type 2

Fast Response Current Sensor - CTHR Type 2

Type 2 - Through hole for best accuracy. As standard the CTHR sensor is supplied connected via a 100cm (39") cable to its conditionwr
  • Type 2 current ranges: From 0-5A to 0-600A, 25.4mm dia
  • AC - 150kHz, Models from 0-5A to 0-600A
  • 9-36V AC powered
Rugged CTHR through hole AC current transducers

AC/AC Current sensor for harsh applications - CTHR Type 3

Current sensor CTHR Type 3, through hole DC-10kHz, optional filters
  • Hole diameter 28.45mm (1.125") Overall size 78.74mm (3.1") x 63.5mm (2.5") x 33mm (1.3")
  • Current ranges: 50 / 100 / 200 / 500 / 1000 / 2000 / 5000A
  • Automotive, vehicle, rail traction and VF drives
CTHR type 5 split core AC current sensing transducer

Fast installation clip-on current sensor - CTH Type 5

Type 5 split core DC-25kHz (filter options). As standard the sensor is supplied connected via a 100cm (39") cable
  • Hole diameter 21mm (0.82") Overall size 69mm (2.72") x 46mm (1.81") x 22mm (0.87")
  • Current ranges: 0-20A with models up to 0-400A split core models.
CTHR split core current sensor Type 6 and CTHR split core sensor Type 7

CTHR split core Type 6 / CTHR split core Type 7

Type 7: DC-10kHz (internal filter 1500Hz). As standard the sensor is supplied connected via a 2.4m (8ft) cable
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 4000A
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 4000A
CTHR Type 4mini and CTHR split core Type 8 mini current sensors

CTHR Type 4 mini and CTHR split core Type 8 mini

Type 8 mini split core DC-400Hz supplied with 8ft cable
  • Hole: 28.5mm (1.125") round hole
  • Outer: 102 mm (4") x 80mm (3.125") x 19mm (0.75")
  • Current ranges: 100 / 200 / 300 / 400A
CTHR through hole AC current sensing hall effect core

CTHR Type 4 and CTHR split core Type 8

Type 8 split core DC-400Hz supplied with 8ft cable
  • 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
CTHR through hole core

CTHR Type 9z

Type 9z split core DC-400Hz with extended cable
  • 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 / 2500 / 3000A
CTHR Type 8F current sensor

CTHR Type 8F

Type 8F split core DC-400Hz supplied with 8ft cable
  • 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
CTHR Type 8EE 4.5inch split core current sensor

CTHR Type 8EE

Type 8EE split core DC-400Hz supplied with 8ft cable
  • 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 / 2500 / 5000A
CTHR Type EE terminals on current sensor

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
CTHR Type D split core terminals on current sensor head

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 / 400 / 500A
CTHR split core Type G current sensor

CTHR split core Type G

Type G split core DC-400Hz supplied with 8ft cable
  • CTHR Hole size 76.2mm (3.0") x 165.1mm (6.5")
  • Outer 196.85mm (7.75") x 304.8mm (12")
  • Current ranges 1000 / 2000 / 3000 / 4000 / 5000 / 6000A
CTHR Type G split core and large Type 10 current sensors

CTHR split core Type 10

Type 10 & 11 split core DC-1kHz
CTHR split core Type 10 for Large DC Currents
  • CTHR Hole size 140mm (5.5") x 203mm (8"). Outer 254 (10") x 350 (13.75")
  • Current ranges 5000 / 6000 / 7000 / 8000 / 9000 / 10000 / 15000 / 20000A
CTHR split core Type 11
  • CTHR aperture 330mm (13") x 330mm (13"). Outer 534mm (21") x 534mm (21")
  • Current ranges 25000 / 30000 / 35000 / 40000AAC
CTLP case A loop powered current sensor

CTLP Compact Loop Powered AC Current Transducer

CTLP case A models 25A, 50A and 100A
  • CTLP Compact Type Loop Powered, ranges:
    CTLP 25 / 50 / 100 / 400 / 500 / 600 / 800 / 1000A
CTLP case Z models current sensor with terminal block

CTLP Compact Loop Powered AC Current Transducer

CTHR 9z core with Terminal Strip connection
  • CTLP Compact Type Loop Powered, ranges:
    CTLP 25 / 50 / 100 / 400 / 500 / 600 / 800 / 1000A
CTHR Din-rail Signal conditioner for current measurement

CTHR Signal conditioner terminal connections

Terminals numbers used in AC Current Transducer Config:
  • Inst. Power: 13/14 +ve/-ve | Sensor 15(wht) 16(Red) 17(blk) 18(Grn)| Outputs: 7/8 4-20mA 9/10 0-10V (7, 9 grounds)
  • Input and output grounds are isolated 300V
  • Signal conditioner overall size 106mm (4.187") x 90mm (3.5") x 32mm (1.25")

Description

The CTHR current sensors convert AC and dc+ac current to an isolated voltage or mA output with fast response and precision. The CTHR sensor output is a faithful representation of the measured current, whether ac or dc. All popular output types; process control voltage and current loop outputs are available. Through hole or split core options mean installation is non-intrusive and straightforward. The input ranges of the CTHR sensors range from 0-1A to 0-40000AAC. Optional DC offset control allows nulling of residual dc current to ensure best accuracy and maximise output span. The current sensor power input is designed to operate over a wide voltage range associated with process control and sub-station auxiliary AC supply systems. Active Hall Effect sensor technology allows measurement from DC-150kHz (depending on the sensor type) with fast step response. The CTHR can provide an instantaneous output for ac currents. Typical applications are found in process control systems like PLC or SCADA, transportation, telecommunications, AC drives, welding and circuit breaker trip coils. For all CTHR models, a NIST/NPL (UKAS) traceable calibration certificate and certificate of conformance is supplied.

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, 4-20mA. All CTHR outputs can be bipolar / instantaneous. Non-standard outputs are available, USB, RS485 and WiFi interfaces available
Core type
Through hole or split core clamp type, sense method based on dc Hall Effect
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 5kVpk 1 min 50/60Hz
Power input
5V / 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 +23°C ±5°C, traceable to UKAS NPL/NIST USA
Working temperature range
Typically -20°C - 65°C (can be extended, check for exact model). Functional temperature range –20°C - 70°C (check for each model). CTHR types 1 & 2 are –40°C - 85°C (sensor head only)
Protection
Input fuse, output fuse, power input polarity diode, spike suppression
Frequency Response
Depending on sensor type/model. Type 1 & 2 DC- 150kHz max. Type 5, 6, 7, 8 & 9 split cores are DC-10kHz 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 400A can be mounted on the signal conditioner case or via a cable.
Approvals
CE Marked, EN61010 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 3: 28.45 (1.125") diameter, ranges 0-50A - 0-5000A, with integral 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 - 3000A Sensor has integral signal conditioner supplied with 2.4M cable

Type 8F (maxi): 57.15mm / 2.25" dia 400A - 3000A Sensor has integral signal conditioner supplied with 2.4M cable

Type 8EE: 108.00mm / 4.25" dia 400A - 3000A 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: 76.2mm x 165.1mm / 3.0" x 6.5" 2500A - 5000A 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 - 40000AAC Sensor connects to signal conditioner via 2.4M cable

Longer cable lengths available - on request

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)

Note: 230Vac/dc and 115Vac/dc adapters are available (in this case the CTHR will be supplied with 9-36Vdc input and ac adapter)

Options R: Ruggedization (not available for all sensor types)

Option T: Extended temperature range -40°C - 85°C (not available for all sensor types)

Options: noise rejection and offset, user can specify upper or lower frequency –3db point

Non standard input current

Non standard output voltage, current (25mA, 1A, 5A), Modbus over EtherNet, RS485 and WiFi interfaces available

All models constructed with self extinguishing materials to UL94V0 and CSA

CTHR / 50A / 4-20 / TH / 24Vdc type 1
50Aac input, 4-20mA output, through hole, 24V aux power input, core type 1 (13.5 x 10mm)
CTHR / 400A / 10 / TH / 48Vdc type 4
±400Aac input, ±0-10V output, through hole, 48Vdc aux power input core type 4 (50mm hole dia)
CTHR / 800A / 5 / SC / 9-32Vdc type 8 RS485
±800Aac input, ±0-5V output, split core, 9-32Vdc aux power input, core type 8 (50mm hole dia) RS485 interface
CTHR / 2000Aac / 4-12-20 / SC / 110Vdc type 7
±2000Aac input, 4-12-20mA output (12mA = zero), split core, 110Vdc aux power input, type 7 core (163 x 50mm)