Current Transducer LKSR series
The LKSR series are closed-loop, multi-range current transducers with voltage output, designed for the electronic measurement of DC, AC, and pulsed currents. They offer galvanic separation between the primary and secondary circuits, featuring a unipolar supply voltage and a compact design for PCB mounting. These transducers provide very low offset drift, excellent dv/dt immunity, and are compatible with the CKSR footprint. They are suitable for applications such as AC variable speed and servo motor drives, static converters, battery-supplied applications, Uninterruptible Power Supplies (UPS), Switched Mode Power Supplies (SMPS), power supplies for welding, and solar inverters. The series is certified according to various IEC and UL standards.
Product Attributes
- Brand: LEM
- Product Series: LKSR
- Certifications: IEC 61800-1, IEC 61800-2, IEC 61800-3, IEC 61800-5-1, IEC 62109-1, IEC 62477-1, UL 508, CSA C22.2 NO. 14-10
- Application Domain: Industrial
- Case Material: V0 according to UL 94
Technical Specifications
| Parameter | Symbol | Unit | LKSR 6-NP (Typ) | LKSR 15-NP (Typ) | LKSR 25-NP (Typ) | Comment |
|---|---|---|---|---|---|---|
| Primary nominal RMS current | IP N | A | 6 | 15 | 25 | Apply derating according to fig. 21, 22, 23 |
| Primary current, measuring range | IP M | A | -20 to 20 | -51 to 51 | -85 to 85 | |
| Number of primary turns | NP | 1, 2, 3, 4 | 1, 2, 3, 4 | 1, 2, 3, 4 | ||
| Supply voltage | UC | V | 4.75 to 5.25 | 4.75 to 5.25 | 4.75 to 5.25 | |
| Current consumption | IC | mA | 17 + 20 * (NP/2000) | 17 + 20 * (NP/2000) | 17 + 20 * (NP/2000) | NS = 2000 turns |
| Reference voltage @ IP = 0 A | Vref | V | 2.485 to 2.515 | 2.485 to 2.515 | 2.485 to 2.515 | Internal reference |
| Output voltage @ IP = 0 A | Vout | V | Vref | Vref | Vref | |
| Electrical offset voltage | VO E | mV | -5 to 100 | -1.75 to 1.75 | -1 to 1 | 100 % tested |
| Temperature coefficient of Vref | TCVref | ppm/K | 70 | 70 | 70 | Internal reference |
| Temperature coefficient of Vout @ IP = 0 A | TCVout | ppm/K | 14 ppm/K of 2.5 V | 6 ppm/K of 2.5 V | 4 ppm/K of 2.5 V | -40 C 105 C |
| Theoretical sensitivity | Gth | mV/A | 104.2 | 41.67 | 25 | 625 mVIP N |
| Sensitivity error | G | % | -0.2 to 0.2 | -0.2 to 0.2 | -0.2 to 0.2 | 100 % tested |
| Temperature coefficient of G | TCG | ppm/K | 40 | 40 | 40 | -40 C 105 C |
| Linearity error | L | % of IP N | -0.1 to 0.1 | -0.1 to 0.1 | -0.1 to 0.1 | |
| Magnetic offset current (10 IP N) referred to primary | IO M | mA | -25 to 25 | -45 to 45 | -60 to 60 | |
| Output RMS voltage noise spectral density (100 100 kHz) referred to primary | eno | V/Hz | 7 | 3.5 | 1.8 | |
| Reaction time @ 10 % of IP N | tra | s | 0.3 | 0.3 | 0.3 | RL = 1 k, di/dt = 50 A/s |
| Step response time to 90 % of IP N | tr | s | 0.4 | 0.4 | 0.4 | RL = 1 k, di/dt = 50 A/s |
| Frequency bandwidth (1 dB) | BW | kHz | 300 | 300 | 300 | RL = 1 k |
| Overall accuracy | XG | % of IP N | 1.25 | 0.75 | 0.75 | |
| Accuracy | X | % of IP N | 0.5 | 0.5 | 0.5 | |
| Absolute maximum ratings: Maximum supply voltage | UC max | V | 7 | 7 | 7 | |
| Absolute maximum ratings: Maximum primary conductor temperature | TB max | C | 110 | 110 | 110 | |
| Absolute maximum ratings: Maximum primary current | IP max | A | 20 IPN | 20 IPN | 20 IPN | |
| Insulation coordination: RMS voltage for AC insulation test, 50 Hz, 1 min | Ud | kV | 4.3 | 4.3 | 4.3 | |
| Insulation coordination: Impulse withstand voltage 1.2/50 s | W | kV | 8 | 8 | 8 | |
| Insulation coordination: Insulation resistance | RINS | G | 18 | 18 | 18 | measured at 500 V DC |
| Insulation coordination: Comparative tracking index | CTI | 600 | 600 | 600 | ||
| Environmental: Ambient operating temperature | TA | C | -40 to 105 | -40 to 105 | -40 to 105 | |
| Environmental: Ambient storage temperature | TS | C | -55 to 125 | -55 to 125 | -55 to 125 | |
| Mechanical: Mass | m | g | 10 | 10 | 10 |
2410311328_LEM-LKSR-15-NP-KIT_C7295781.pdf
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