Current Transducer LA 55-P I = 50 A P N For the electronic measurement of currents: DC, AC, pulsed..., with galvanic separation between the primary circuit and the secondary circuit. Electrical data I Primary nominal RMS current 50 A P N I Primary current, measuring range 0 … ±70 A Features P M R Measuring resistance @ T = 70 °C T = 85 °C M A A R R R R ● Closed loop (compensated) M min M max M min M max with ±12 V @ ±50 A 10 100 60 95 Ω current transducer using the Hall max @ ±70 A 10 50 60 1) 60 1) Ω effect max with ±15 V @ ±50 A 50 160 135 155 Ω ● Insulating plastic case recognized max @ ±70 A 50 90 135 2) 135 2) Ω according to UL 94-V0. max I Secondary nominal RMS current 50 mA S N Advantages N /N Turns ratio 1 : 1000 P S U Supply voltage (±5 %) ±12 ... 15 V ● Excellent accuracy C I Current consumption (±2) 10 (@ ±15 V) + I mA ● Very good linearity C S ● Low temperature drift Accuracy - Dynamic performance data ● Optimized response time ● Wide frequency bandwidth ε Error @ I , T = 25 °C @ ±15 V (±5 %) ±0.65 % P N A ● No insertion losses @ ±12 … 15 V (±5 %) ±0.90 % ● High immunity to external ε Linearity error < 0.15 % L interference Typ Max ● Current overload capability. I Offset current @ I = 0, T = 25 °C ±0.2 mA O P A I Magnetic offset current 3) @ I = 0 and specified R , Applications O M P M after an overload of 3 × I ±0.3 mA P N I Temperature variation of I −25 °C … +85 °C ±0.1 ±0.6 mA ● AC variable speed drives and O T O −40 °C … −25 °C ±0.2 ±1.0 mA servo motor drives t Delay time @ 10 % of I < 500 ns ● Static converters for DC motor D 10 P N t Delay time to 90 % of I 4) < 1 µs drives D 10 P N BW Frequency bandwidth (−1 dB) DC … 200 kHz ● Battery supplied applications ● Uninterruptible Power Supplies General data (UPS) ● Switched Mode Power Supplies T Ambient operating temperature −40 … +85 °C A (SMPS) T Ambient storage temperature −40 … +90 °C S ● Power supplies for welding R Resistance of secondary winding @ T = 70 °C 80 Ω S A applications. @ T = 85 °C 85 Ω A m Mass 18 g Application domain Standards EN 50178: 1997 ● Industrial. UL 508: 2010 Notes: 1) Measuring range limited to ±60 A max 2) Measuring range limited to ±55 A max 3) Result of the coercive field of the magnetic circuit 4) For a di/dt = 200 A/µs. N° 97.13.25.000.0 Page 1/3 17September2018/version 17 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com

Current Transducer LA 55-P Insulation coordination U RMS voltage for AC insulation test, 50 Hz/1 min 2.5 kV d U Impulse withstand voltage 1.2/50 µs 5.7 kV Ni Min d Creepage distance 5 mm Cp d Clearance 5 mm CI CTI Comparative tracking index (group I) 600 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 d , d , U Rated insulation voltage Nominal voltage Cp CI Ni Basic insulation 300 V 300 V Reinforced insulation 150 V 150 V 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 (eg. 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 17September2018/version 17 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com

Dimensions LA 55-P (in mm) d d Cl Cp I d d P Cl Cp dCl dCp IS RM U Connection I C P IP I R UC I R S M S M U U C C U UC dCl dCp C Mechanical characteristics Remarks I P ● General tolerance ±0.2 mm ● IS is positive when IP flows in the directionIS of thReM arrow. ● Primary through-hole 12.7 × 7 mm ● Temperature of the primary conductor should not exceed ● Fastening & connection of secondary 3 pins 90 °C. U 0.6 × 0.7 mm ● Installation of the transducer must be done unless C ● Recommended PCB hole 1.2 mm otherwise specified on the datasheet, according to LEUM ⌀ C Transducer Generic Mounting Rules. Please refer to LEM document N°ANE120504 available on our Web site: https://www.lem.com/en/file/3137/download/. ● Dynamic performances (di/dt and delay time) are best with a single bar completely filling the primary hole. ● In order to achieve the best magnetic coupling, the primary windings have to be wound over the top edge of the device. ● This is a standard model. For different versions (supply voltages, turns ratios, unidirectional measurements...), please contact us. Page 3/3 17September2018/version 17 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com