LEM, a global leader in sensor solutions, has unveiled its latest innovation with the introduction of the CDT series, a remarkable addition to the LEM RCM type B current sensor family. Engineered for measuring and safeguarding against AC and DC fault current (leakage current), the CDT series boasts proprietary fluxgate architecture, ensuring best-in-class accuracy to mitigate potential fire hazards and electrical shocks.
Designed with versatility in mind, the CDT series is configurable for up to 4 conductors with a robust capability of 48 Arms, accommodating 1 and 3-phase systems. This flexibility is further optimized for leakage measurement configurations by design. The sensors provide a tripping fault current output and feature an SPI bus, enabling a rapid response time along with detailed fault information.
For automotive applications, particularly bidirectional on-board chargers, an ISO 26262 ASIL B-compliant version adds an extra layer of safety diagnostics. The measurement principle is grounded in stability; in a fault-free system, the sum of current flowing in conductors is null. When a fault occurs, a measurable difference between phase and neutral conductors is detected, representing the leakage current and indicating a loss of insulation from a conductor to the earth.
The CDT series comes with a host of features and technical advantages, including automotive qualifications (AEC-Q100 and 200 components), a unipolar +5 V DC power supply, a primary current measurement range of ±300 mA DC, an external test via a dedicated pin, SPI and digital tripping outputs, a compact PCB-mountable design, excellent accuracy, fast tripping, and reinforced galvanic insulation.
Typical applications of the CDT series include on-board chargers for automotive use, supporting capacities up to 22 kW, and off-board charging in Mode 2 (In Cord Control and Protection Device) and Mode 3 (Wall Box Chargers). For those prioritizing functional safety, the SF version of the CDT series complies with ISO 26262 ASIL B standards.
The CDT series adheres to international standards such as IEC 62752 and UL 2231, reaffirming LEM's commitment to delivering cutting-edge solutions that prioritize safety and precision in industrial and automotive settings. With its advanced features, the CDT series sets a new benchmark for current sensors, ensuring optimal performance and reliability in diverse applications.
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