CKSR 50-NP , CKSR50-NP

CKSR50-NP Closed-Loop Current Sensor | LEM Fluxgate Technology · 50A / ±150A · High Accuracy · Compact Design

CKSR50-NP Product Overview

The CKSR50-NP is a high-performance current sensor from LEM, a world-leading sensor manufacturer. It features advanced closed-loop fluxgate technology, combining high accuracy, wide measuring range, low drift, and a compact design. The sensor has a nominal current rating of 50 A and a measuring range up to ±150 A, making it ideal for precision measurement of DC, AC, and pulsed currents.

As industrial automation continues to advance, the demand for higher accuracy and reliability in current measurement grows. The CKSR50-NP is designed to meet this challenge. Its outstanding performance makes it a top choice for engineers seeking superior current sensing solutions.

CKSR50-NP Key Technical Highlights

Closed-Loop Fluxgate Technology – Uncompromising Accuracy
Closed-loop compensated fluxgate technology greatly improves measurement precision and stability while effectively reducing common-mode interference. Compared to traditional Hall-effect sensors, it offers much lower offset and gain drift.

Triple Measuring Range – High Overcurrent Capability
Rated at 50 A, the sensor can measure up to ±150 A – three times its nominal value. This generous margin provides design flexibility and enhanced safety.

Microsecond Response – Capture Fast Transients
With a response time of only 0.3 µs (300 ns) and a 300 kHz bandwidth, the CKSR50-NP accurately captures rapidly changing current signals, ensuring reliable performance in dynamic applications such as motor drives and switching power supplies.

Stable Over Full Temperature – From Extreme Cold to High Heat
Operating temperature range: -40 °C to +105 °C. The sensor maintains stable performance in both freezing and high-temperature environments.

High Isolation Voltage – Safe & Worry-Free
Isolation voltage: 1000 Vrms. This provides robust electrical safety isolation, meeting standard industrial insulation requirements and protecting both equipment and personnel.

Very Low Temperature Drift – Consistent Measurements
Extremely low offset temperature coefficient and highly stable internal reference voltage ensure consistent measurement results across the full temperature range, reducing the need for additional temperature compensation.

Compact Design – Easy PCB Mounting
Optimised for PCB mounting with a compact outline that can be soldered directly onto the board. This saves valuable space and is ideal for space-constrained applications.

CKSR50-NP Detailed Technical Specifications

CKSR50-NP Typical Applications

Thanks to its outstanding performance and wide adaptability, the CKSR50-NP is used in many industrial fields:

Variable Frequency Drives: AC variable-frequency drives and servo motor drives – accurate motor current monitoring improves control precision.

Power Supplies: UPS, switch-mode power supplies, battery-powered systems – ensuring safe and reliable power.

Renewable Energy: Solar photovoltaic inverters – supporting efficient use of green energy.

Industrial Automation: Static converters, DC motor drives, welding power supplies – meeting the needs of various industrial devices.

Transportation: Current monitoring in rail applications (optional automotive-grade additional testing available).