LEM
United States

LEM USA Inc.

11665 West Bradley Road
Milwaukee, WI, 53224
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CDT series

CDT is an automotive grade leakage current sensor family from LEM also called Residual Current Monitoring (RCM) or Residual Current Detection (RCD) class B and B+, dedicated to DC, AC and AC+DC leakage current measurement.

CDT series

CDT family has been designed to achieved best in class performances, measuring and detecting as low as 5 mA DC or AC leakage. Sensor family is suitable for various AC charging applications:

  • AC wallbox
  • ICCPD (charging cable)
  • None isolated On Board Charger (OBC) 
  • V2G: Vehicle to Grid
  • V2L:  Vehicle to Load

The CDT sensor family give you the choice of having single or three-phase versions as well as safety version in the same housing and provide fast digital tripping output when leakage current is detected.

MAIN CHARACTERISTICS:

  • Fluxgate Open loop current transducers
  • RCD Class B (CDT) and B+ (DCDT)
  • Single or three-phase versions
  • Supply voltage 5 V
  • SPI output
  • Digital tripping output
  • Very high accuracy ±0.5 mA 
  • Very Low Thermal Offset drift
  • Tripping signal for Fast reaction time
  • Reinforced galvanic insulation
  • 40A RMS per primary conductors
  • +/-300 mA leakage current measurement range
  • Test winding
  • Automotive qualified -40 to +105 °C
  • Safety ISO26262 qualified: ASIL B ready (SF version)

FEATURES:

  • 4 primary conductors compatible with three-phase and single-phase On-Board Chargers
  • Maximum RMS primary current per primary conductor of 40 A RMS
  • Unipolar +5 V DC power supply
  • Primary current measurement range: ±300 mA DC
  • Frequency bandwidth up to 2 kHz (CDT version), and up to 100kHz (DCDT version)
  • Operating temperature range: −40 °C < T < +105 °C
  • Test winding
  • SPI and digital tripping outputs
  • Compact design for PCB mounting
  • IEC 62752 / UL 2231 / VDE 0664-400 (up to 100 kHz)

Download

Product Standard Max primary current (ARMS) Leakage Measuring Range (ADC) Primary Conductors Bandwidth (Hz) Tripping signal (leakage threshold) Document
CDT(SF)

IEC62752,
UL2231,
(ISO26262)

40/80

±300 mA DC

up to 4 DC - 2 kHz Adjustable/ Factory set

Datasheet

Application note

DCDT(SF)

IEC62752,
UL2231,
VDE 0664-400,
(ISO26262)

40/80

±300 mA DC

up to 4

DC-2kHz

47Hz-100kHz

Adjustable/ Factory set

Datasheet

Application note

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