CASR25-NP Closed-Loop Fluxgate Current Sensor – High Accuracy · Fast Response · Industrial-Grade Reliability

CASR25-NP Three Key Technology Highlights

Closed-Loop Fluxgate Technology – Precision and Stability Assured

The CASR25-NP employs LEM’s proprietary closed-loop fluxgate technology, offering significantly higher measurement accuracy and better noise immunity than traditional open-loop Hall-effect sensors. Whether in electrically noisy industrial environments or high-frequency switching power supplies, it delivers stable, accurate output while effectively rejecting external electromagnetic interference.

Ultra-Fast Response – Capture Every Transient

System response speed directly determines the timeliness of protection actions and control accuracy. With a response time < 0.3 µs, the CASR25-NP instantly detects and reports current anomalies – giving you critical milliseconds for overcurrent protection and dynamic control applications.

Flexible Configuration – One Solution, Multiple Needs

The CASR25-NP features an innovative three-U-shaped primary pin design. By flexibly connecting these pins, engineers can easily adjust the sensor’s measurement range, supporting up to three times the rated current (up to 85 A). One device covers multiple power levels for current detection.

CASR25-NP Key Specifications

CASR25-NP Wide Range of Applications

The high accuracy and wide dynamic range of the CASR25-NP make it ideal for current sensing in many fields:

Industrial Automation

Real-time current monitoring and overcurrent protection for servo drives, variable frequency drives, and DC motor drives – ensuring stable operation under demanding conditions.

Renewable Energy & Energy Storage

DC-side and AC-side current detection in photovoltaic inverters, charge/discharge current monitoring in energy storage converters (PCS), and precise measurement in EV charging modules – contributing to efficient green energy conversion.

Power Supplies

Output current feedback control for switch-mode power supplies (SMPS), battery management and load monitoring in uninterruptible power supplies (UPS) – improving efficiency and reliability.
Other Professional Applications

Current control in welding equipment, charge/discharge monitoring in battery management systems, and high-accuracy measurements in precision test instruments.

Why Choose the CASR25-NP?

LEM’s Proven Quality

LEM is the benchmark brand in current sensing, known for continuous R&D and strict quality standards. The CASR25NP undergoes rigorous quality control from chip design to finished product, ensuring stable, reliable performance from every unit.

5-Year Warranty

LEM offers a 5-year warranty for the CASR series. This reflects our confidence in product quality and our long-term commitment to customers – reducing your maintenance costs and operational risk.

Optimized PCB Design Experience

The CASR25-NP features a compact through-hole package with a height approximately 30% lower than previous LTS series, saving valuable board space. Complete 3D models, PCB footprints, and technical documentation are provided to help you quickly complete schematic design and hardware layout – shortening development cycles.

Isolated Safety – Double Protection

Built-in galvanic isolation between primary and secondary circuits greatly enhances system safety. The housing meets UL 94-V0 flame resistance standards, satisfying the stringent safety requirements of industrial applications.