LEM’s 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 family has been designed to achieve 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 wall box
- 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)
| Product | Standard | Max primary current (ARMS) | Leakage Measuring Range (ADC) | Primary Conductors | Bandwidth (Hz) | Tripping signal (leakage threshold) |
| CDT(SF) | IEC62752, UL2231, (ISO26262) |
40/80 | ±300 mA DC | up to 4 | DC - 2 kHz | Adjustable/ Factory set |
| DCDT(SF) | IEC62752, UL2231, VDE 0664-400, (ISO26262) |
40/80 | ±300 mA DC | up to 4 |
DC-2kHz 47Hz-100kHz |
DC-2kHz 47Hz-100kHz |
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