LA125-P-SP4 Datasheet, PDF (1/3 Pages) LEM – Current Transducer

Current Transducer LA 125-P/SP4
For the electronic measurement of currents: DC, AC, pulsed...,
with galvanic isolation between the primary circuit (high power) and
the secondary circuit (electronic circuit).
I_PN = 125 A
16053
Electrical data
I_PN
Primary nominal current rms
125
A
I_PM Primary current, measuring range 0 .. ± 300
A
R_M Measuring resistance
T_A = 70°C T_A = 85°C

R R R R _{M min M max}
M min M max

with ± 12 V
@ ± 125 A _max
0 89 0 85
Ω

@ ± 200 A _max
0 29 0 25
Ω

with ± 15 V
@ ± 125 A _max
0 134 0 130 Ω

@ ± 200 A _max
0 54 0 50
Ω

@ ± 300 A _max
0 11 0 7
Ω
I_SN
Secondary nominal current rms
62.5
mA
K_N Conversion ratio 1 : 2000
V_C Supply voltage (± 5 %) ± 12 .. 15
V
I_C
Current consumption 16 (@ ± 15 V) + I_S mA
Features
●● Closed loop (compensated)
current transducer using the Hall
effect
●● Printed circuit board mounting
●● Isolated plastic case recognized
according to UL 94-V0.
Special features
●● K_N = 1: 2000
●● T_A = - 40°C .. + 85°C
●● Potted.
Accuracy - Dynamic performance data
Advantages
X
Accuracy @ I_PN , T_A = 25°C @ ± 15 V (± 5 %)
± 0.60
@ ± 12 .. 15 V (± 5 %) ± 0.80
ε
L
Linearity error < 0.15
Typ Max
I_O
Offset current @ I_P = 0, T_A = 25°C
± 0.20
I_OM
Magnetic offset current ¹⁾ @ I_P = 0 and specified R_M,
after an overload of 3 x I_PN
± 0.25
I_OT
Temperature variation of I_O
- 25°C .. + 85°C ± 0.20 ± 0.50

- 40°C .. - 25°C ± 0.30 ± 0.80
t_ra
t_r
di/dt
Reaction time to 10 % of I_PN
Response time ^{2) 3)} to 90 % of I_PN step
di/dt accurately followed ⁴⁾
< 500
< 1
> 200
BW Frequency bandwidth ⁴⁾ (- 1 dB) DC .. 100
%
%
%
mA
mA
mA
mA
ns
µs
A/µs
kHz
●● 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
General data
drives
●● Battery supplied applications
T_A
Ambient operating temperature - 40.. + 85
°C
T_S
Ambient storage temperature - 45 .. + 100
°C
R_S Secondary coil resistance
@ T_A = 70°C
76
Ω
@ T_A = 85°C
80
Ω
m
Mass 55
g
Standards EN 50155: 1995
Notes: ¹⁾ Result of the coercive field of the magnetic circuit

2) _{With a di/dt of 100 A/µs}
3) _{The primary conductor is best filling the through-hole and/or the return of}
●● Uninterruptible Power Supplies
(UPS)
●● Switched Mode Power Supplies
(SMPS)
●● Power supplies for welding
applications.
Application domain
●● Traction.
the primary conductor is above the top of the transducer.
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LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
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