LAH25-NP

Current Transducer LAH 25-NP For the electronic measurement of currents: DC, AC, pulsed..., with galvanic separation between the primary circuit and the secondary circuit. IP N = 8-12-25 A Electrical data IP N Primary nominal RMS current IP M Primary current, measuring range 1) RM Measuring resistance @ 2) with ±12 V @ IP N [±At DC] @ IP N [At RMS] 3) with ±15 V @ IP N [±At DC] @ IP N [At RMS] 3) @ IP < IP N 4) IS N Secondary nominal RMS current NP/NS Turns ratio UC Supply voltage (±5 %) IC Current consumption 25 A 0 … ±55 A TA = 70 °C TA = 85 °C RM min RM max RM min RM max 0 284 0 280 Ω 0 182 0 178 Ω 67 398 70 394 Ω 67 263 70 259 Ω 25 mA 1-2-3 : 1000 ±12 … 15 V 10 (@ ±15 V) + IS mA Accuracy - Dynamic performance data εtot Total error 5) @ IP N, TA = 25 °C ±0.3 εL Linearity error < 0.2 Typ Max IO Offset current referred to primary @ IP = 0, TA = 25 °C ±150 IO Offset current referred to secondary @ IP = 0, TA = 25 °C ±0.15 IO M Magnetic offset current @ IP = 0, referred to secondary and specified RM, after an overload of 5 × IP N ±0.20 ±0.25 IO T Temperature variation of IO, referred to secondary 0 °C … +70 °C ±0.10 ±0.60 ‒25 °C … +85 °C ±0.10 ±0.70 tD 10 Delay time to 10 % of the final output value for IP N step 6) < 200 tD 90 Delay time to 90 % of the final output value for IP N step 6) < 500 BW Frequency bandwidth (−1 dB) DC … 200 % % mA mA mA mA mA ns ns kHz General data TA Ambient operating temperature ‒25 … +85 °C TA st Ambient storage temperature ‒40 … +90 °C RS Resistance of secondary winding @ TA = 70 °C 72 Ω @ TA = 85 °C 76 Ω m Mass 20 g Standards EN 50178: 1997 Notes: 1) During 10 s, with RM ≤ 109 Ω (UC = ±15 V) 2) Calculation of RM min with the maximum power of the transistors = 0.307 W @ 70 °C and the maximum power of the transistors = 0.302 W @ 85 °C 3) Sinusoidal wave 50 Hz 4) The minimum measuring resistance RM may be lower (see “LAH technical information” leaflet) 5) Without IO & IO M 6) For a di/dt = 100 A/µs. ● Closed loop (compensated) multirange current transducer using the Hall effect ● Printed circuit board mounting ● Insulating plastic case recognized according to UL 94-V0. Advantages ● ● ● ● ● ● Excellent accuracy Very good linearity Low temperature drift Optimized delay time No insertion losses High immunity to external interference ● Current overload capability. Applications ● AC variable speed drives and servo motor drives ● Static converters for DC motor drives ● Battery supplied applications ● Uninterruptible Power Supplies (UPS) ● Switched Mode Power Supplies (SMPS) ● Power supplies for welding applications. Application domain ● Industrial. Page 1/3 N° 97.34.19.000.0 11June2021/version 11 Features LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice LEM International SA Chemin des Aulx 8 1228 PLAN-LES-OUATES Switzerland www.lem.com Current Transducer LAH 25-NP Insulation coordination U d RMS voltage for AC insulation test, 50 Hz, 1 min 5 kV UNi Impulse withstand voltage 1.2/50 μs 12 kV U e Partial discharge extinction RMS voltage @10 pC > 2 Min kV dCp Creepage distance 1) 12 mm dCI Clearance 1) 12 mm CTI Comparative tracking index (group IIIa) 175 Note: 1) On PCB with soldering pattern UTEC93-703. Applications examples According to EN 50178 and IEC 61010-1 standards and following conditions: ● Over voltage category OV 3 ● Pollution degree PD2 ● Non-uniform field EN 50178 IEC 61010-1 Rated insulation voltage Nominal voltage Basic insulation 1000 V 1000 V Reinforced insulation 500 V 500 V dCp, dCI, UNi Safety This transducer must be used in limited-energy secondary circuits according to IEC 61010-1. This transducer must be used in electric/electronic equipment with respect to applicable standards and safety requirements in accordance with the manufacturer’s operating instructions. Caution, risk of electrical shock When operating the transducer, certain parts of the module can carry hazardous voltage (e.g. primary busbar, power supply). Ignoring this warning can lead to injury and/or cause serious damage. This transducer is a build-in device, whose conducting parts must be inaccessible after installation. A protective housing or additional shield could be used. Main supply must be able to be disconnected. Page 2/3 11June2021/version 11 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice LEM International SA Chemin des Aulx 8 1228 PLAN-LES-OUATES Switzerland www.lem.com Dimensions LAH 25-NP (in mm) Connection IS RISM RM UC UC UC UC dCI Number of primary turns Primary current nominal 1 2 3 IP N [A] 25 12 8 Primary current Nominal output maximum current Turns ratio IP [ A ] IS N [ mA ] NP /NS 55 25 1 : 1000 27 18 24 24 2 : 1000 3 : 1000 Primary resistance Primary insertion inductance 0.18 0.012 RP [ mΩ ] 0.81 1.62 ● General tolerance ● Fastening & connection of primary Recommended PCB hole ● Fastening & connection of secondary Recommended PCB hole dCp dCp Recommended PCB connections LP [ µH ] 3 2 1 IN OUT 4 3 5 2 6 1 IN OUT 4 5 6 3 2 1 4 5 6 0.054 IN 0.110 OUT Mechanical characteristics dCI Remarks ● ±0.2 mm 6 pins 1 mm × 0.8 mm ● 1.5 mm 3 pins 0.7 mm × 0.6 mm ● 1.2 mm IS is positive when IP flows from terminals 1, 2, 3 (IN) to terminals 6, 5, 4 (OUT). The jumper temperature and PCB should not exceed 100 °C. This is a standard model. For different versions (supply voltages, turns ratio, unidirectional measurements...), please contact us. Page 3/3 11June2021/version 11 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice LEM International SA Chemin des Aulx 8 1228 PLAN-LES-OUATES Switzerland www.lem.com