Current Transducer LA 25-NP/SP14 IPN = 0.25 A For the electronic measurement of currents : DC, AC, pulsed, mixed, with a galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic circuit). Electrical data IPN IP RM Primary nominal r.m.s. current Primary current, measuring range Measuring resistance with 15 V ISN KN VC IC Vd Vb @ 0.25 A max @ 0.36 A max Secondary nominal r.m.s. current Conversion ratio Supply voltage ( 5 %) Current consumption R.m.s. voltage for AC isolation test, 50 Hz, 1 mn R.m.s. rated voltage 1), safe separation basic isolation 0.25 0 .. 0.36 R M min R M max A A Features 100 100 turns current transducer using the Hall effect *Insulated plastic case recognized according to UL 94-V0. 320 190 25 100 : 1000 15 10 + IS 2.5 600 1700 mA V mA kV V V Accuracy - Dynamic performance data X Typical accuracy @ IPN , TA = 25C Linearity L 0.5 < 0.2 % % Typ Max Offset current 2) @ IP = 0, TA = 25C 0.05 0.15 Residual current 3) @ IP = 0, after an overload of 3 x IPN 0.05 0.15 Thermal drift of IO - 10C .. + 70C 0.10 0.35 mA mA mA tr f Response time 4) @ 90 % of IP max Frequency bandwidth (- 1 dB) s kHz <1 DC .. 150 General data Ambient operating temperature Ambient storage temperature Primary coil resistance @ TA = 25C Secondary coil resistance @ TA = 70C Primary insertion inductance Isolation resistance @ 500 V, TA = 25C Mass Standards 5) Special features *IPN *IP *K N *TA = = = = 0.25 A 0 .. 0.36 A 100 : 1000 - 10C .. + 70C. Advantages IO IOM IOT TA TS RP RS LP R IS m *Closed loop (compensated) multi- *Excellent accuracy *Very good linearity *Low temperature drift *Optimized response time *Wide frequency bandwidth *No insertion losses *High immunity to external interference *Current overload capability. Applications - 10 .. + 70 - 25 .. + 85 < 745 110 496 > 1500 22 EN 50178 C C m H M g *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 Notes : 1) 2) 3) 4) 5) Pollution class 2 Measurement carried out after 15 mn functionning The result of the coercive field of the magnetic circuit With a di/dt of 100 A/s A list of corresponding tests is available LEM Components applications. 990126/2 w w w .lem.com Dimensions LA 25-NP/SP14 Bottom view (in mm. 1 mm = 0.0394 inch) Right view Top view swiss made Standard 00 or N SP.. Year Week Secondary terminals Terminal + : supply voltage + 15 V Terminal M : measure Terminal - : supply voltage - 15 V Connection in out Back view Mechanical characteristics Remark *General tolerance *Fastening & connection of primary *IS is positive when IP flows from terminal + to terminal -. 0.2 mm 2 pins 0.635 x 0.635 mm *Fastening & connection of secondary 3 pins 1 mm *Recommended PCB hole 1.2 mm LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.