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LEM CKSR Board Mount Current Transducers

LEM CKSR Board Mount Current Transducers are designed for precise electronic measurement of DC, AC, and pulsed currents, ranging from 1.5A to 75A RMS, while ensuring galvanic isolation between the primary and secondary circuits. These compact, Fluxgate-based transducers operate on a single +5V supply, offering low offset and gain drift, with a measuring range extending up to three times the nominal primary current (Ipn). Additionally, the LEM CKSR sensors are designed for PCB mounting, making them convenient for integration into various systems.

With four primary pins, CKSR sensors accommodate small current measurements across multiple models (6A, 15A, 25A, 50A, and 75A). The CKSR 75-NP version features five primary conductors, providing enhanced creepage and clearance distances for improved insulation. These sensors also offer reference access and utilize closed-loop Fluxgate technology, making them highly reliable for industrial applications requiring high accuracy and electrical isolation.

Features

  • Closed loop (compensated) multi-range current transducer
  • Voltage output
  • Single supply
  • Closed-loop Fluxgate technology
  • Very low temperature coefficient of offset
  • Very good du/dt immunity
  • Higher creepage distance/clearance
  • Reference pin with two modes (Ref IN and Ref OUT)
  • Extended measuring range for unipolar measurement
  • Dedicated 5 primary conductors configuration (CKSR 75-NP only)
  • Compact design with a reduced height for PCB mounting
  • 5-year warranty
  • RoHS compliant

Applications

  • AC variable speed and servo motor drives
  • Static converters for DC motor drives
  • Battery supplied applications
  • Uninterruptible Power Supplies (UPS)
  • Switched Mode Power Supplies (SMPS)
  • Power supplies for welding applications
  • Solar inverters
  • Automotive (CKSR 6-NP, CKSR 15-NP, CKSR 25-NP, CKSR 50-NP only)

Specifications

  • 7V maximum supply voltage
  • 1000VAC/DC primary involved potential
  • 5VDC secondary supply voltage
  • 0V to 5V output voltage
  • 1000V partial discharge RMS test voltage
  • 600 comparative tracking index
  • UL 94V-0 rated case material
  • +110°C maximum primary conductor temperature
  • +105°C maximum surrounding air temperature
  • -40°C to +105°C ambient operating temperature range
  • 4kV maximum ESD rating, Human Body Model (HBM)

Datasheets

Connections

Schematic - LEM CKSR Board Mount Current Transducers

Dimensions (mm)

Mechanical Drawing - LEM CKSR Board Mount Current Transducers
Publicado: 2025-07-21 | Actualizado: 2025-07-31