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Current Transducer LA 125-P
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).
IPN
=
125 A
Electrical data
IPN IP RM Primary nominal r.m.s. current Primary current, measuring range Measuring resistance @ with 12 V with 15 V ISN KN VC IC Vd @ 125 A max @ 200 A max @ 125 A max @ 200 A max 125 0 .. 200 TA = 70C TA = 85C RM min RM max RM min RM max 5 5 25 25 52 20 74 34 14 14 40 40 1) 50 18 72 40 1) A A
Features
*Closed loop (compensated) current
transducer using the Hall effect

*Printed circuit board mounting *Insulated plastic case recognized
according to UL 94-V0.
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
125 mA 1 : 1000 12 .. 15 V 16 (@ 15 V) + IS mA 3 kV
Advantages
*Excellent accuracy *Very good linearity *Low temperature drift *Optimized response time *Wide frequency bandwidth *No insertion losses *High immunity to external
interference
Accuracy - Dynamic performance data
X Accuracy @ IPN , TA = 25C
L
@ 15 V ( 5 %) @ 12 .. 15 V ( 5 %)
Linearity
0.60 0.80 < 0.15 Max 0.40 0.50 0.50 0.60
% % % mA mA mA mA ns s A/s kHz
*Current overload capability.
IO I OM IOT tra tr di/dt f
Typ Offset current @ IP = 0, TA = 25C Residual current 2) @ IP = 0, after an overload of 3 x IPN Thermal drift of IO 0C .. + 70C 0.15 - 25C .. + 85C 0.15 Reaction time @ 10 % of IP max Response time 3) 4) @ 90 % of IP max di/dt accurately followed 4) Frequency bandwidth 4) (- 1 dB)
Applications
*AC variable speed drives and servo
motor drives
< 500 <1 > 200 DC .. 100
*Static converters for DC motor drives *Battery supplied applications *Uninterruptible Power Supplies
(UPS)
*Switched Mode Power Supplies
(SMPS)
General data
TA TS RS m Ambient operating temperature Ambient storage temperature Secondary coil resistance @ Mass Standards
1) 2) 3) 4)
TA = 70C TA = 85C
5)
- 25 .. + 85 - 40 .. + 90 32 33.5 40 EN 50178
C C g
*Power supplies for welding
applications.
Notes :
5)
Measuring range limited to 180 A max The result of the coercive field of the magnetic circuit With a di/dt of 100 A/s The primary conductor is best filling the through-hole and/or the return of the primary conductor is above the top of the transducer A list of corresponding tests is available
980716/5
LEM Components
w w w .lem.com
Dimensions LA 125-P
Bottom view
(in mm. 1 mm = 0.0394 inch)
Left view
Standard 00 or N SP..
Year Week
Secondary terminals
Terminal - : supply voltage - 12 .. 15 V Terminal M : measure Terminal + : supply voltage + 12 .. 15 V Terminal : NC
swiss made
Connection
Front view Mechanical characteristics
*General tolerance 0.2 mm *Primary through-hole 17 x 11 mm *Fastening & connection of secondary 4 pins 0.63 x 0.56 mm
Recommended PCB hole *Supplementary fastening Recommended PCB hole Recommended screws LEM code 0.9 mm 2 holes 1.75 mm 2.4 mm K A 22 x 6 47.30.60.006.0
Remarks
*IS is positive when IP flows in the direction of the arrow. *Temperature of the primary conductor should not exceed
90C. *Dynamic performances (di/dt and response time) are best with a primary bar in low position in the through-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.

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