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Current Transducer LA 35-NP
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).
IPN = 7-8-11-17-35 A
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 @ 35 At @ 70 At
max max
35 1) 0 .. 70 RM min RM max 60 60 320 85
At At
Features
*Closed loop (compensated) multirange current transducer using the Hall effect *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 R.m.s. rated voltage 2), safe separation basic isolation
35 mA 1-2-3-4-5 : 1000 15 V 10 + IS mA 2.5 kV 600 V 1700 V
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
L
Accuracy @ IPN , TA = 25C Linearity Offset current 3) @ IP = 0, TA = 25C Residual current 4) @ IP = 0, after an overload of 3 x IPN Thermal drift of IO - 25C .. + 70C Response time 5) @ 90 % of IP max di/dt accurately followed Frequency bandwidth (- 1 dB)
0.5 < 0.2 Typ 0.10 0.05 0.15 Max 0.20 0.15 0.50
% % mA mA mA s A/s kHz
IO IOM IOT tr di/dt f
*Current overload capability.
Applications
*AC variable speed drives and servo
motor drives
<1 > 50 DC .. 150
General data
TA TS RP RS R IS m Ambient operating temperature Ambient storage temperature Primary resistance per turn @ TA = 25C Secondary coil resistance @ TA = 70C Isolation resistance @ 500 V, TA = 25C Mass Standards 6) - 25 .. + 70 - 40 .. + 85 < 1.25 80 > 1500 22 EN 50178 C C m M g
*Static converters for DC motor drives *Battery supplied applications *Uninterruptible Power Supplies
(UPS)
*Switched Mode Power Supplies
(SMPS)
*Power supplies for welding
applications.
Notes :
1)
2) 3) 4) 5) 6)
In order to avoid over-heating, it is necessary that the recommended primary connections be followed (see table page 2) Pollution class 2 Measurement carried out after 15 mn functioning 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
980909/1
LEM Components
w w w .lem.com
Dimensions LA 35-NP
Bottom view
(in mm. 1 mm = 0.0394 inch)
Right view
Top view
swiss
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
Number of primary turns
Primary current nominal maximum
Nominal output current
Turns ratio
Primary resistance
Primary insertion inductance
Recommended connections
IPN [ A ] 35
IP
[A]
ISN
[ mA ]
KN 1 / 1000
RP
[ m ]
LP 0.023
[ H ]
54321 IN
1
70
35
0.3
OUT
6 7 8 9 10 54321 IN
2
17
34
34
2 / 1000
1.1
0.09
OUT 6 7 8 9 10 54321 IN
3
11
22
33
3 / 1000
2.5
0.21
OUT 6 7 8 9 10 54321 IN
4
8
16
32
4 / 1000
4.4
0.37
OUT 6 7 8 9 10 54321 IN
5
7
14
35
5 / 1000
6.3
0.58
OUT 6 7 8 9 10
Mechanical characteristics
*General tolerance *Fastening & connection of primary *Fastening & connection of secondary *Recommended PCB hole
0.2 mm 10 pins 0.7 x 0.6 mm 3 pins 1 mm 1.2 mm
Remarks
*IS is positive when IP flows from terminals 1, 2, 3, 4, 5 to
terminals 10, 9, 8, 7, 6
*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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