LA25-NP_11 Datasheet, PDF (1/3 Pages) LEM – Current Transducer

Current Transducer LA 25-NP
For the electronic measurement of currents: DC, AC, pulsed...,
with galvanic isolation between the primary circuit and the secondary
circuit.
I_PN = 5-6-8-12-25 At
16080
Electrical data
I_PN
Primary nominal current rms
I_PM
Primary current, measuring range
R_M
Measuring resistance @

with ± 15 V
@ ± 25 At _max

@ ± 36 At _max
I_SN
Secondary nominal current rms
K_N
Conversion ratio
V_C
Supply voltage (± 5 %)
I_C
Current consumption
25
At
0 .. ± 36
At
T_A = 70°C T_A = 85°C
R R R R _{M min}
M max M min
M max
100 320 100 315 Ω
100 190 100 185 Ω
25
mA
1-2-3-4-5 : 1000
± 15
V
10 + I_S
mA
Accuracy - Dynamic performance data
X
ε
L
I_O
I_OM
I_OT
t_r
di/dt
BW
Accuracy @ I_PN, T_A = 25°C
Linearity error
± 0.5
< 0.2

Typ Max
Offset current ¹⁾ @ I_P = 0, T_A = 25°C
Magnetic offset current ²⁾ @ I_P = 0 and specified R_M,
after an overload of 3 x I_PN
Temperature variation of I_O
0°C .. + 25°C

+ 25°C .. + 70°C
± 0.05 ± 0.15
± 0.05 ± 0.15
± 0.06 ± 0.25
± 0.10 ± 0.35

- 25°C .. + 85°C
± 0.5

- 40°C .. + 85°C
± 1.2
Response time ³⁾ to 90 % of I_PN step
di/dt accurately followed
< 1
> 50
Frequency bandwidth (- 1 dB)
DC .. 150
%
%
mA
mA
mA
mA
mA
mA
µs
A/µs
kHz
General data
T_A
Ambient operating temperature
T_S
Ambient storage temperature
R_P
Primary coil resistance per turn @ T_A = 25°C
R_S
Secondary coil resistance
@ T_A = 70°C
@ T_A = 85°C
R_IS
Isolation resistance @ 500 V, T_A = 25°C
m
Mass
Standards
- 40 .. + 85
°C
- 45 .. + 90
°C
< 1.25
mΩ
110
Ω
115
Ω
> 1500
MΩ
22
g
EN 50178: 1997
Features
●● Closed loop (compensated)
current transducer using the Hall
effect
●● Isolated plastic case recognized
according to UL 94-V0.
Advantages
●● 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
●● 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
applications.
Application domain
●● Industrial.
Notes: ¹⁾ Measurement carried out after 15 mn functioning
²⁾ The result of the coercive field of the magnetic circuit
³⁾ With a di/dt of 100 A/µs.
9November2011/version 14
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
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