Product Overview
The LEM LA 25-NP is a closed-loop Hall effect current transducer designed for precise electronic measurement of DC, AC, and pulsed currents with galvanic isolation between primary and secondary circuits. It offers excellent accuracy, very good linearity, low temperature drift, optimized response time, and a wide frequency bandwidth, making it suitable for various industrial applications including AC and DC motor drives, UPS, SMPS, and welding power supplies. The transducer features an isolated plastic case recognized according to UL 94-V0 and provides high immunity to external interference and current overload capability.
Product Attributes
- Brand: LEM
- Origin: Not specified
- Material: Isolated plastic case (UL 94-V0 recognized)
- Color: Not specified
- Certifications: UL 94-V0, EN 50178, IEC 61010-1
Technical Specifications
| Parameter | Value | Unit | Notes | ||||
| Electrical Data | |||||||
| Primary nominal current rms (IPN) | 25 | A | |||||
| Primary current, measuring range (IPM) | 0 .. 36 | A | |||||
| Secondary nominal current rms (ISN) | 25 | mA | |||||
| Conversion ratio (KN) | 1-2-3-4-5 : 1000 | ||||||
| Supply voltage (VC) ( 5 %) | 15 | V | |||||
| Current consumption (IC) | 10 + IS | mA | |||||
| Accuracy - Dynamic performance data | |||||||
| Accuracy @ IPN, TA = 25C | 0.5 % | Max | |||||
| Linearity error (L) | < 0.2 | % Typ | |||||
| Offset current (IO) @ IP = 0, TA = 25C | 0.05 / 0.15 | mA | Typ / Max | ||||
| Magnetic offset current (IOM) @ IP = 0 and specified RM, after overload | 0.05 / 0.15 | mA | Typ / Max | ||||
| Temperature variation of IO (0C .. + 25C) | 0.06 / 0.25 | mA | Typ / Max | ||||
| Temperature variation of IO (+ 25C .. + 70C) | 0.10 / 0.35 | mA | Typ / Max | ||||
| Temperature variation of IO (- 25C .. + 85C) | 0.5 | mA | Max | ||||
| Temperature variation of IO (- 40C .. + 85C) | 1.2 | mA | Max | ||||
| Response time (tr) to 90 % of IPN step | < 1 | s | |||||
| di/dt accurately followed | > 50 | A/s | |||||
| Frequency bandwidth (- 1 dB) (BW) | DC .. 150 | kHz | |||||
| General Data | |||||||
| Ambient operating temperature (TA) | - 40 .. + 85 | C | |||||
| Ambient storage temperature (TS) | - 45 .. + 90 | C | |||||
| Primary coil resistance per turn (RP) @ TA = 25C | < 1.25 | m | |||||
| Secondary coil resistance (RS) @ TA = 70C | 110 | ||||||
| Secondary coil resistance (RS) @ TA = 85C | 115 | ||||||
| Isolation resistance (RIS) @ 500 V, TA = 25C | > 1500 | M | |||||
| Mass | 22 | g | |||||
| Isolation Characteristics | |||||||
| Rms voltage for AC insulation test (Vd), 50 Hz, 1 min | 2.5 | kV | |||||
| Impulse withstand voltage (Vw) 1.2/50 s | 9 | kV | |||||
| Creepage distance (dCp) | 10.63 | mm | |||||
| Clearance (dCI) | 10.63 | mm | |||||
| Comparative Tracking Index (CTI) (group IIIa) | 175 | ||||||
| Dimensions (mm) | |||||||
| Primary turns | IPN [A] | IP [A] | ISN [mA] | KN | RP [m] | LP [H] | Connections |
| 1 | 25 | 36 | 25 | 1 / 1000 | 0.3 | 0.023 | IN(1-5), OUT(6-10) |
| 2 | 12 | 18 | 24 | 2 / 1000 | 1.1 | 0.09 | IN(1-5), OUT(6-10) |
| 3 | 8 | 12 | 24 | 3 / 1000 | 2.5 | 0.21 | IN(1-5), OUT(6-10) |
| 4 | 6 | 9 | 24 | 4 / 1000 | 4.4 | 0.37 | IN(1-5), OUT(6-10) |
| 5 | 5 | 7 | 25 | 5 / 1000 | 6.3 | 0.58 | IN(1-5), OUT(6-10) |
2410121516_LEM-LA25-NP_C454699.pdf
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