CTSR 1-TP/SP19

Current Sensors Overview

The CTSR 1-TP/SP19 is a board-mount current transducer from the LEM CTSR series, designed for precise non-contact measurement of DC, AC, and pulsed currents. It utilizes closed-loop fluxgate technology to achieve high accuracy with minimal offset drift. The device features galvanic isolation between primary and secondary circuits, supporting a rated current range of 0.3 to 1 A rms. It operates on a single +5V supply and includes an additional reference pin for flexible integration with ADCs or DSPs. The sensor offers a large aperture for easy conductor insertion and is suitable for applications requiring high insulation distances.

Current Sensors Feature Summary

• Closed-loop fluxgate technology ensures high precision and low temperature offset drift
• Single +5V power supply operation simplifies integration into existing systems
• Galvanic isolation provides safety with large creepage and clearance distances
• Flexible reference pin supports both internal voltage reference output and input modes

Current Sensors Applications

• Residual current measurement in industrial systems
• Leakage current detection in transformerless photovoltaic inverters
• First-person contact protection for photovoltaic arrays
• Symmetrical fault detection in motor inverters
• Leakage current detection in superimposed DC power supplies

Current Sensors Procurement Notes

Verify the specific suffix SP19 against official LEM documentation to confirm pinout and interface compatibility. Ensure the application environment meets the operating temperature and voltage specifications. Confirm that the required accuracy and bandwidth align with the closed-loop fluxgate performance characteristics. Check for any recent product change notices affecting the component's electrical parameters or mechanical dimensions.

Current Sensors Selection Notes

Select this model when high precision and low offset are critical for residual or leakage current monitoring. The CTSR 1-TP/SP19 is ideal for applications requiring non-contact measurement with a small rated current range up to 1 A rms. Consider the additional reference pin functionality if interfacing with external analog-to-digital converters. Evaluate the need for galvanic isolation and the specific aperture size for conductor installation.

Current Sensors Part Context

The CTSR series represents LEM's advanced closed-loop fluxgate current sensors, designed for compact PCB mounting. These sensors offer superior accuracy compared to standard Hall-effect devices, particularly in low-current applications. The CTSR 1-TP/SP19 variant specifically targets precise milliampere-level measurements, making it suitable for sensitive industrial control and energy monitoring systems where signal integrity is paramount.

Current Sensors Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Verify compatibility with direct replacements by cross-referencing technical datasheets for matching electrical specifications, pin configurations, and mechanical dimensions. Consult official LEM documentation for any recommended alternatives within the CTSR family or other LEM sensor lines.