
The CKSR6-NP is a high-precision, closed-loop multi-range current sensor from LEM’s CKSR series. It is designed to measure DC, AC, and pulsed currents while providing galvanic isolation between the primary and secondary circuits. With a rated measurement current of 6 A, the sensor uses flux-gate, closed-loop compensation technology. Thanks to its excellent linearity, very low zero-point temperature drift, and fast response, it is widely used in AC variable speed drives, servo motor drives, switch-mode power supplies (SMPS), uninterruptible power supplies (UPS), solar inverters, and other precision industrial applications.
Whether you are designing a compact power supply system or looking for an accurate current feedback component for a motor drive project, the CKSR6-NP delivers stable and reliable current sensing in a space-saving package.
1. Ultra-fast response – captures minute current changes
A response time of only 0.3 µs allows the CKSR6-NP to capture transient current fluctuations in real time, making it ideal for applications that require rapid reaction, such as inverter overcurrent protection and high-frequency switching power supplies.
2. High accuracy across the full range – trustworthy data
The sensor achieves an accuracy of ±0.8 % over the entire measurement range. With a rated detection range of ±6 A and linearity of ±1 %, it provides stable and accurate output for most low-voltage, low-current applications.
3. Highly integrated – easy to embed in PCB designs
The compact through-hole PCB design has a low profile, fitting easily into space-constrained boards. The sensor provides four primary pins that allow multi-range switching from ±1.5 A to ±6 A via different connection configurations – greatly increasing design flexibility.
4. Excellent environmental robustness and safety
Wide operating temperature range from -40 ℃ to +105 ℃ ensures stable performance in both cold and hot environments.
1000 Vrms isolation voltage protects downstream control circuits from high-voltage surges, and the sensor is UL recognized and RoHS compliant.
Outstanding dv/dt immunity and low offset temperature coefficient guarantee stable voltage output even in noisy environments such as variable frequency drives.
|
Parameter |
Value |
|
Brand |
LEM |
|
Series |
CKSR series |
|
Measured quantity |
AC/DC current |
|
Rated current (IPN) |
±6 A |
|
Sensor type |
Flux-gate, closed-loop compensation |
|
Output voltage |
Ratio-metric voltage output |
|
Sensitivity |
104.2 mV/A |
|
Accuracy |
±0.8 % |
|
Linearity |
±1 % |
|
Frequency bandwidth |
300 kHz |
|
Response time |
0.3 µs |
|
Supply voltage |
4.75 V – 5.25 V DC |
|
Supply current |
≤ 20 mA |
|
Isolation voltage |
1000 Vrms |
|
Operating temperature |
-40 ℃ ~ +105 ℃ |
|
Mounting type |
Through-hole (PCB) |
|
Flammability rating |
UL94V-0 |
The CKSR6-NP is widely used in the following industrial and consumer power electronics applications:
Motor drives – AC variable frequency drives, servo motor drives, DC motor static converters
Power supplies – switch-mode power supplies (SMPS), uninterruptible power supplies (UPS)
Renewable energy – solar photovoltaic inverters
Battery management – battery-powered systems, battery current monitoring
Industrial power – welding equipment power supplies, industrial power monitoring
|
Feature |
Traditional open-loop sensor |
CKSR6-NP (closed-loop flux-gate) |
|
Accuracy & linearity |
Moderate accuracy, susceptible to temperature drift |
±0.8 % accuracy, ±1 % linearity over full range; closed-loop compensation, very low drift |
|
Response speed |
Slow (typically > µs) |
0.3 µs ultra-fast response – captures transient overcurrent in time |
|
Noise immunity |
Moderate, vulnerable to dv/dt interference |
Excellent dv/dt immunity – works reliably in noisy inverter / VFD environments |
|
Thermal stability & drift |
Significant drift with temperature |
Low offset temperature coefficient – stable output over -40 ℃ to +105 ℃ |
|
Isolation protection |
Varies widely |
1000 Vrms high isolation voltage; UL / RoHS certified |
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