Accurate current measurement LEM LA25-P transducer designed for servo drives UPS and battery powered systems
Product Overview
The LEM LA 25-P is a closed-loop (compensated) current transducer utilizing Hall effect technology for the electronic measurement of DC, AC, and pulsed currents. It provides galvanic separation between the primary and secondary circuits, featuring an insulating plastic case recognized according to UL 94-V0. This transducer offers excellent accuracy, very good linearity, low temperature drift, optimized response time, and a wide frequency bandwidth, with no insertion losses and high immunity to external interference, along with current overload capability. It is designed for industrial applications, including AC variable speed drives, servo motor drives, static converters for DC motor drives, battery supplied applications, Uninterruptible Power Supplies (UPS), Switched Mode Power Supplies (SMPS), and power supplies for welding applications.
Product Attributes
- Brand: LEM
- Certifications: UL 94-V0, EN 50178, IEC 61010-1
- Application Domain: Industrial
Technical Specifications
| Parameter | Value | Unit | Notes |
| Primary nominal rms current (IPN) | 25 | A | |
| Primary current, measuring range (IPM) | 0 .. 55 | A | |
| Secondary nominal rms current (ISN) | 25 | mA | |
| Conversion ratio (KN) | 1 : 1000 | ||
| Supply voltage (UC) ( 5 %) | 12 .. 15 | V | |
| Current consumption (IC) | 10 | mA | (@ 15 V) + IS |
| Accuracy @ IPN, TA = 25 C | 0.95 % | @ 15 V ( 5 %) | |
| Accuracy @ IPN, TA = 25 C | 1.25 % | @ 12 .. 15 V ( 5 %) | |
| Linearity error (L) | < 0.15 | % | Typ Max |
| Offset current (IO) @ IP = 0, TA = 25 C | 0.2 | mA | |
| Magnetic offset current (IOM) @ IP = 0, after overload | 0.3 | mA | (3 IPN) |
| Temperature variation of IO (0 C .. + 70 C) | 0.1 .. 0.5 | mA | |
| Temperature variation of IO (- 25 C .. + 85 C) | 0.1 .. 0.6 | mA | |
| Reaction time (tra) | < 500 | ns | |
| Step response time to 90 % of IPN | < 1 | s | |
| di/dt accurately followed | > 200 | A/s | |
| Frequency bandwidth (- 1 dB) (BW) | DC .. 200 | kHz | |
| Ambient operating temperature (TA) | - 25 .. + 85 | C | |
| Ambient storage temperature (TS) | - 40 .. + 90 | C | |
| Resistance of secondary winding (RS) @ TA = 70 C | 80 | ||
| Resistance of secondary winding (RS) @ TA = 85 C | 85 | ||
| Mass | 24 | g | |
| Rms voltage for AC insulation test (Ud) | 3 | kV | (50 Hz, 1 min) |
| Impulse withstand voltage (W) | 5.7 | kV | (1.2/50 s) |
| Creepage distance (dCp) | 5 | mm | |
| Clearance (dCI) | 5 | mm | |
| Comparative tracking index (CTI) | 600 | (group I) |
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