LEM – CDT Series: Specialized Leakage Current Sensor / Residual Current Monitoring (RCM)

The CDT is a Residual Current Monitoring (RCM) or Residual Current Detection (RCD) type B and B+ product. The sensors are designed to measure and protect against DC, AC, and AC+DC leakage currents. With LEM’s exclusive fluxgate architecture, the CDT sensor provides the best accuracy in its class, protecting against potential fire and electric shock hazards. The product can be configured with up to 4 current conductors at 48A, supporting both single-phase and three-phase systems, and provides optimized leakage measurements based on the design configuration.

The CDT current sensor offers fault current output and SPI bus, enabling fast response and detailed fault information. For automotive applications, such as Bidirectional Onboard Chargers, the ISO26262 ASIL B-compliant version provides safety diagnostics.

Specifications: 

– Automotive standard -40 to +125 °C (AEC-Q100 and 200 components)  

– RMS current up to 48 A per main conductor  

– Main current measurement range: ±300 mA DC  

– External check via dedicated pin  

– SPI and digital interrupt output  

– Compact design for PCB mounting  

– Excellent accuracy ±0.5 mA  

– Reinforced galvanized insulation layer.  

Advantages: 

– Accurate measurement 

– Safe and reliable 

– Flexible configuration capabilities 

– Easy integration 

Applications: 

– AC wallbox 

– ICCPD (charging cable) 

– Onboard charger (bidirectionnal)  

– OBC automotive on-board charger up to 22 kW 

Learn more: CDT series

Contact EPI Vietnam Technologies – the authorized distributor of LEM in Vietnam for better support on products and prices