CASR15-NP/SP6 Closed-Loop Fluxgate Current Sensor

CASR15-NP/SP6 Product Overview

The CASR15-NP/SP6 is a compact, high-accuracy current sensor from LEM, the world leader in current and voltage sensing technology. Based on closed-loop fluxgate principle, this model belongs to the CASR-NP series and is designed for demanding industrial applications that require exceptional precision, stability, and fast response. It accurately measures DC, AC, and pulsed currents while providing galvanic isolation between the primary and secondary circuits.

Whether you are developing servo drives, switch-mode power supplies, UPS systems, or solar inverters, the CASR15-NP/SP6 delivers reliable, accurate, and costeffective current measurement for your designs.

CASR15-NP/SP6 Key Advantages

High Accuracy & Low Drift – Measurement Data You Can Trust

Thanks to its advanced closed-loop fluxgate technology, the CASR15-NP/SP6 achieves an accuracy of ±0.8% and a linearity of better than ±0.1%. More importantly, it features extremely low offset and gain temperature drift, ensuring stable and precise output even in harsh industrial environments where temperature fluctuates widely. Your control system always receives true and dependable current feedback.

Wide Measuring Range – One Sensor for Multiple Current Scenarios

Rated current (Ipn): 15 A

Maximum measuring range: −51 A to +51 A (up to 3× the rated value)

This wide range allows the sensor to accurately capture small signals while also handling transient overcurrents, providing ample safety margin for your system design.

Ultra-Fast Response – Never Miss a Transient

Response time: only 0.3 µs

Bandwidth: DC ~ 300 kHz

Such outstanding dynamic performance ensures that the sensor captures every minute change in current, delivering real-time feedback to your control loop for more precise and efficient regulation.

SingleSupply Operation – Simplified Design

Powered by a single 4.75 V ~ 5.25 V supply, the sensor eliminates the need for complex dual-rail power schemes, significantly reducing external circuitry, system cost, and design effort.

Voltage Output – Truly “Plug and Play”

The output is a voltage signal of 2.5 V ± 0.625 V, with a sensitivity of 41.67 mV/A. This standardised output format can be directly connected to most ADCs or microcontrollers without additional signal-conditioning circuitry – true plug-and-play convenience.

Compact Footprint – Saves Valuable PCB Space

The CASR15-NP/SP6 features a compact PCB-mount design that minimises board occupation, enabling higher-density product layouts. Its housing is made of UL94-V0 rated flame-retardant insulating material, ensuring both safety and reliability.

Excellent Noise Immunity

With superior dv/dt immunity, the sensor performs reliably even in high-switching-frequency, electromagnetically noisy environments, giving you peace of mind in tough applications.

CASR15-NP/SP6 Technical Specifications at a Glance

CASR15-NP/SP6 Typical Applications

With its outstanding performance, the CASR15-NP/SP6 is widely used in:

Variable-frequency AC drives and servo motor drives – accurate current feedback is the key to high-performance motor control.

Static converters for DC motor drives – ensures conversion efficiency and system stability.

Uninterruptible power supplies (UPS) – real-time current monitoring for reliable power delivery.

Switch-mode power supplies (SMPS) – improves control accuracy and transient response.

Power supplies for welding equipment – maintains stable measurements in harsh operating conditions.

Solar inverters – supports efficient renewable energy systems.

Battery-powered equipment – precise battery current monitoring and management.

Why Choose the CASR15-NP/SP6?

Global brand leader – LEM is the world-renowned expert in current/voltage sensing, with CE certification and compliance with EMC standards.

Superior performance – closed-loop fluxgate technology delivers high accuracy, low drift, and fast response.

Design-friendly – single-supply, voltage output, and compact packaging dramatically reduce development complexity.

Robust and reliable – wide operating temperature range (−40 °C to +85 °C), high isolation voltage, and flame-retardant housing ensure dependable operation in demanding environments.

Available from stock – multiple authorised distributors offer off-the-shelf availability and fast delivery.