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Current Transducer LF 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).
16167
I PN = 300 A
Features
I PN
I PM
R M
 
 
 
 
I SN
K N
V C
I C
Electrical data
Primary nominal current rms
Primary current, measuring range
Measuring resistance @
with ± 12 V @ ± 300 A max
  @ ± 500 A max
with ± 15 V @ ± 300 A max
  @ ± 500 A max
with ± 20 V @ ± 300 A max
  @ ± 500 A max
Secondary nominal current rms
Conversion ratio
Supply voltage (± 5 %)
Current consumption
300 A
0 .. ± 500 A
T A = 70°C T A = 85°C
R M min R M max R M min R M max
0 37 0 35 ?
0 10 0 8 ?
0 56 0 54 ?
0 21 0 19 ?
0 88 0 86 ?
0 40 0 38 ?
150 mA
1 : 2000
± 12 .. 20 V
26 (@± 20V)+ I S mA
● 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.
Accuracy - Dynamic performance data
Applications
ε
X G
L
I O
I OM
I OT
t ra
t r
di/dt
BW
Overall accuracy @ I PN , T A = 25°C
Linearity error
Offset current @ I P = 0, T A = 25°C
Magnetic offset current 1) @ I P =0 and specified R M
after an overload of 3 x I PN
Temperature variation of I O - 40°C .. + 85°C
- 10°C .. + 70°C
Reaction time to 10 % of I PN
Response time 2) to 90 % of I PN step
di/dt accurately followed
Frequency bandwidth (- 1 dB)
± 0.5
< 0.1
Typ Max
± 0.2
± 0.2
± 0.2 ± 0.7
± 0.1 ± 0.3
< 500
< 1
> 100
DC .. 100
%
%
mA
mA
mA
mA
ns
μs
A/μs
kHz
● 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 domains
General data
● Industrial.
T A
T S
R S
m
Ambient operating temperature
Ambient storage temperature
Secondary coil resistance @ T A = 70°C
T A = 85°C
Mass
Standards
- 40 .. + 85
- 40 .. + 85
30
32
95
EN 50178:1997
°C
°C
?
?
g
Notes : 1) The result of the coercive field of the magnetic circuit
2)
With a di/dt of 100 A/μs.
Page 1/3
110210/11
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
www.lem.com
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