Current Transducer LA 55-P I = 50 A PN For the electronic measurement of currents : DC, AC, pulsed..., with a galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic circuit). Electrical data I Primary nominal r.m.s. current 50 A Features PN I Primary current, measuring range 0 .. ± 70 A P R Measuring resistance @ T = 70°C T = 85°C ·Closed loop (compensated) current M A A R R R R transducer using the Hall effect M min M max M min M max ·Printed circuit board mounting with ± 12 V @ ± 50 A 10 100 60 95 W max ·Insulated plastic case recognized 1) 1) @ ± 70 A 10 50 60 60 W max according to UL 94-V0. with ± 15 V @ ± 50 A 50 160 135 155 W max 2) 2) @ ± 70 A 50 90 135 135 W max Advantages I Secondary nominal r.m.s. current 50 mA SN K Conversion ratio 1 : 1000 N ·Excellent accuracy V Supply voltage (± 5 %) ± 12 .. 15 V C ·Very good linearity I Current consumption 10 (@ ± 15 V) + I mA C S ·Low temperature drift V R.m.s. voltage for AC isolation test, 50 Hz, 1 mn 2.5 kV d ·Optimized response time ·Wide frequency bandwidth Accuracy - Dynamic performance data ·No insertion losses ·High immunity to external X Accuracy @ I , T = 25°C @ ± 15 V (± 5 %) ± 0.65 % PN A interference @ ± 12 .. 15 V (± 5 %) ± 0.90 % ·Current overload capability. e Linearity < 0.15 % L Typ Max Applications I Offset current @ I = 0, T = 25°C ± 0.2 mA O P A 3) I Residual current @ I = 0, after an overload of 3 x I ± 0.3 mA OM P PN ·AC variable speed drives and servo I Thermal drift of I 0°C .. + 70°C ± 0.1 ± 0.5 mA OT O motor drives - 25°C .. + 85°C ± 0.1 ± 0.6 mA ·Static converters for DC motor drives t Reaction time @ 10 % of I < 500 ns ·Battery supplied applications ra P max t Response time @ 90 % of I < 1 µs ·Uninterruptible Power Supplies r P max di/dt di/dt accurately followed > 200 A/µs (UPS) f Frequency bandwidth (- 1 dB) DC .. 200 kHz ·Switched Mode Power Supplies (SMPS) General data ·Power supplies for welding applications. T Ambient operating temperature - 25 .. + 85 °C A T Ambient storage temperature - 40 .. + 90 °C S R Secondary coil resistance @ T = 70°C 80 W S A T = 85°C 85 W A m Mass 18 g 4) Standards EN 50178 1) Notes : 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) A list of corresponding tests is available 980706/8 LEM Components www.lem.com Dimensions LA 55-P (in mm. 1 mm = 0.0394 inch) Bottom view Left view Secondary terminals swiss Terminal + : supply voltage + 12 .. 15 V made Terminal - : supply voltage - 12 .. 15 V Terminal M : measure Connection Standard 00 Year Week or N° SP.. Front view Mechanical characteristics Remarks ·General tolerance ± 0.2 mm ·I is positive when I flows in the direction of the arrow. S P ·Primary through-hole 12.7 x 7 mm ·Temperature of the primary conductor should not exceed ·Fastening & connection of secondary 3 pins 90°C. 0.63 x 0.56mm ·Dynamic performances (di/dt and response time) are best Recommended PCB hole 0.9 mm 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. LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.