CAS15-NP – High-Precision Fluxgate Current Sensor

CAS15-NP Product Overview

The CAS15-NP is a star product in LEM’s CAS series of miniature fluxgate current sensors, specifically designed for high-precision measurement of DC, AC, and pulsed currents within a ±15 A range. Using advanced fluxgate technology, the CAS15-NP achieves 0.8% high accuracy and an ultra-fast 0.3 µs response time while operating from a single +5 V supply. It is an ideal solution for current monitoring and control in industrial automation, renewable energy systems, and power electronics.

For a long time, engineers have faced the challenge of achieving high precision, fast response, and compact size in current measurement. Traditional solutions often force trade-offs between accuracy, size, and response speed. The CAS15-NP combines high-precision measurement capability with a compact, modular package, delivering a voltage output directly proportional to the primary current without requiring expensive external signal conditioning circuits – making your design simpler and more efficient.

CAS15-NP Key Performance Specifications

CAS15-NP Key Advantages

3.1 High Accuracy for Reliable Signal Acquisition

With 0.8% accuracy and 1% linearity, the CAS15-NP precisely captures subtle changes in current signals. Whether for precision motor control or demanding power management, the CAS15-NP provides reliable data to support your system’s performance.

3.2 Ultra-Fast Response – No Missed High-Frequency Dynamic Signals

A 0.3 µs response time and 300 kHz bandwidth mean the CAS15-NP easily handles fast-changing current waveforms in high-frequency switching power supplies, inverters, and similar equipment, ensuring precise real-time response even under high-frequency operation.

3.3 Wide Temperature Range – Stable in Harsh Environments

An operating temperature range of -40℃ to +85℃ allows the CAS15-NP to perform reliably in demanding applications such as outdoor power equipment and industrial sites. Whether in extreme cold or heat, you can trust its long-term stability.

3.4 Low Power Consumption – Supports Green Energy Designs

With a maximum supply current of only 20 mA, the CAS15-NP has a negligible impact on overall system power consumption, making it an ideal fit for modern, energy-efficient power electronics designs.

3.5 Compact Package – Easy Integration into Limited Spaces

The modular package design, with an overall depth of just 13.4 mm and through-hole mounting, allows the CAS15-NP to be easily integrated into various PCB layouts – even inside equipment with tight space constraints.

3.6 Electrical Isolation – Safe and Reliable

A dielectric test voltage of 4.3 kVRMS provides a sufficient safety isolation margin between the primary (high-voltage) side and secondary (low-voltage) side, effectively protecting downstream control and sampling circuits for long-term system safety.

CAS15-NP Typical Applications

The CAS15-NP has been widely validated in the following fields:

Renewable Energy Systems: Current monitoring and protection in solar inverters, wind turbine converters, micro-turbines, and battery management systems.

Industrial Automation: Closed-loop current control and feedback acquisition in DC motor drives, variable frequency drives, and switching power supplies.

Power Electronics: Current detection at critical nodes in AC/DC rectifiers, UPS systems, and HVAC equipment.

Test & Measurement Instruments: High-accuracy current measurement instruments, power analyzers, and other equipment demanding strict accuracy and fast response.