Current Transducer LA 255-S
For the electronic measurement of currents : DC, AC, pulsed...,
with a galvanic isolation between the primary circuit (high power)
and the secondary circuit (electronic circuit).
I
PN
=
250 A
Electrical data
I
PN
I
P
脦
P max
R
M
Primary nominal r.m.s. current
Primary current, measuring range
Measuring overload
1)
Measuring resistance @
with 鹵 12 V
with 鹵 15 V
with 鹵 18 V
I
SN
K
N
V
C
I
C
V
b
@ 鹵 250 A
max
@ 鹵 500 A
max
@ 鹵 250 A
max
@ 鹵 500 A
max
@ 鹵 250 A
max
@ 鹵 500 A
max
250
0 .. 鹵 500
600
T
A
= 70擄C
T
A
= 85擄C
R
M min
R
M max
R
M min
R
M max
0
0
5
5
25
25
49
7
70
17
93
29
0
0
5
5
25
25
47
5
68
15
91
27
A
A
A
Features
鈥?/div>
Closed loop (compensated) current
transducer using the Hall effect
鈥?/div>
Insulated plastic case recognized
according to UL 94-V0.
鈩?/div>
鈩?/div>
鈩?/div>
鈩?/div>
鈩?/div>
鈩?/div>
Advantages
鈥?/div>
Excellent accuracy
鈥?/div>
Very good linearity
鈥?/div>
Low temperature drift
鈥?/div>
Optimized response time
鈥?/div>
Wide frequency bandwidth
鈥?/div>
No insertion losses
鈥?/div>
High immunity to external
interference
鈥?/div>
Current overload capability.
Secondary nominal r.m.s. current
Conversion ratio
Supply voltage (鹵 5 %)
Current consumption
R.m.s. rated voltage
2)
, safe separation
basic isolation
125
mA
1 : 2000
鹵 12 .. 18
V
20
(@ 鹵 15 V) +
I
S
mA
1625
V
3250
V
Accuracy - Dynamic performance data
X
G
蔚
L
Overall accuracy @
I
PN
,
T
A
= 25擄C
Linearity
Offset current @
I
P
= 0,
T
A
= 25擄C
Residual current
3)
@
I
P
= 0, after an overload of 3 x
I
PN
Thermal drift of
I
O
- 10擄C .. + 85擄C
Reaction time @ 10 % of
I
P max
Response time
4)
@ 90 % of
I
P max
di/dt accurately followed
Frequency bandwidth (- 3 dB)
Ambient operating temperature
Ambient storage temperature
Secondary coil resistance @
Mass
Standards
1)
2)
鹵 0.8
< 0.1
Max
鹵 0.15
鹵 0.50
鹵 0.15 鹵 0.30
< 500
<1
> 100
DC .. 100
- 10 .. + 85
- 40 .. + 90
35
37
110
EN 50178
Typ
%
%
mA
mA
mA
ns
碌s
A/碌s
kHz
擄C
擄C
鈩?/div>
鈩?/div>
g
Applications
鈥?/div>
AC variable speed drives and servo
motor drives
鈥?/div>
Static converters for DC motor drives
鈥?/div>
Battery supplied applications
鈥?/div>
Uninterruptible Power Supplies
(UPS)
鈥?/div>
Switched Mode Power Supplies
(SMPS)
鈥?/div>
Power supplies for welding
applications.
I
O
I
OM
I
OT
t
ra
t
r
di/dt
f
T
A
T
S
R
S
m
Notes :
General data
T
A
= 70擄C
T
A
= 85擄C
5)
3)
4)
5)
3 mn/hour @
V
C
= 鹵 15 V,
R
M
= 5
鈩?/div>
Pollution class 2. With a non insulated primary bar which fills the
through-hole
The result of the coercive field of the magnetic circuit
With a di/dt of 100 A/碌s
A list of corresponding tests is available
980707/3
LEM Components
w w w .lem.com
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