LA305-S_11 Datasheet, PDF (1/3 Pages) LEM – Current Transducer

Current Transducer LA 305-S
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 = 300 A
16173
Electrical data
I_PN
Primary nominal current rms
I_PM
Primary current, measuring range

R_M
Measuring resistance
with ± 12 V
@ ± 300 A _max

@ ± 500 A _max
with ± 15 V
@ ± 300 A _max

@ ± 500 A _max
I_SN
Secondary nominal current rms
K_N
Conversion ratio
V_C
Supply voltage (± 5 %)
I_C
Current consumption
Accuracy - Dynamic performance data
300
A
0 .. ± 500
A
T_A = 70°C T_A = 85°C
R R R R _{M min M max M min M max}
0 52 0 50 Ω
0 17 0 15 Ω
0 75 5 73 Ω
0 31 5 29 Ω
120
mA
1 : 2500
± 12 .. 15
V
20 (@ ± 15 V) + I_S mA
XεG
L
I_O
I_OM
I_OT
t_ra
t_r
di/dt
BW
Overall accuracy @ I_PN, T_A = 25°C
Linearity error
± 0.8
< 0.1

Typ Max
Offset current @ I_P = 0, T_A = 25°C
± 0.20
Magnetic offset current ¹⁾ @ I_P = 0 and specified R_M,
after an overload of 3 x I_PN
± 0.40
Temperature variation of I_O
- 10°C .. + 85°C ± 0.12 ± 0.30
Reaction time @ 10 % of I_PN
< 500
Response time ²⁾ @ 90 % of I_PN step
< 1
di/dt accurately followed
> 100
Frequency bandwidth (- 3 dB)
DC .. 100
%
%
mA
mA
mA
mA
ns
µs
A/µs
kHz
General data
T_A
Ambient operating temperature
T_S
Ambient storage temperature
R_S
Secondary coil resistance
@ T_A = 70°C

@ T_A = 85°C
m
Mass
Standards
- 10 .. + 85
°C
- 40 .. + 90
°C
35
Ω
37
Ω
200
g
EN 50178: 1997
Notes: ¹⁾ The result of the coercive force (Hc) of the magnetic circuit
²⁾ With a di/dt of 100 A/µs.
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.
110203/9
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
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