Current Transducer LA 25-NP/SP7
For the electronic measurement of currents: DC, AC, pulsed...,
with galvanic isolation between the primary circuit and the secondary
circuit.
I
PN
= 2.5 A
16160
Electrical data
I
PN
I
PM
R
M
I
SN
K
N
V
C
I
C
Primary nominal current rms
Primary current, measuring range
Measuring resistance
with ± 15 V
@ ± 2.5 A
max
@ ± 3.6 A
max
Secondary nominal current rms
Conversion ratio
Supply voltage (± 5 %)
Current consumption
2.5
0 .. ± 3.6
R
M min
R
M max
100 320
100 190
25
10 : 1000
± 15
10 +
I
S
A
A
Ω
Ω
mA
V
mA
Features
● Closed loop (compensated)
current transducer using the Hall
effect
● Isolated plastic case recognized
according to UL 94-V0.
Special features
●
I
PN
= 2.5 A
●
I
PM
= 0 .. ± 3.6 A
●
K
N
= 10 : 1000.
Accuracy - Dynamic performance data
X
Advantages
± 0.5
< 0.2
Typ
Max
± 0.05 ± 0.15
± 0.05 ± 0.15
± 0.06 ± 0.25
± 0.10 ± 0.35
<1
> 50
DC .. 150
%
%
mA
mA
mA
mA
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.
●
●
●
●
●
●
●
ε
L
Accuracy @
I
PN
,
T
A
= 25°C
Linearity error
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
3)
Response time to 90 % of
I
PN
step
di/dt accurately followed
Frequency bandwidth (- 1 dB)
I
O
I
OM
I
OT
t
r
di/dt
BW
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.
General data
T
A
T
S
R
P
R
S
L
P
R
IS
m
Ambient operating temperature
Ambient storage temperature
Primary coil resistance
@
T
A
= 25°C
Secondary coil resistance
@
T
A
= 70°C
Insertion inductance
Isolation resistance @ 500 V,
T
A
= 25°C
Mass
Standards
0 .. + 70
- 25 .. + 85
< 8.5
110
5.5
> 1500
22
EN 50178: 1997
°C
°C
mΩ
Ω
µH
MΩ
g
Application domain
Notes:
Measurement carried out after 15 mn functioning
The result of the coercive field of the magnetic circuit
3)
With a di/dt of 100 A/µs.
1)
2)
● Industrial.
Page 1/3
9November2011/version 5
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
www.lem.com
Current Transducer LA 25-NP/SP7
Isolation characteristics
V
d
V
w
dCp
dCI
CTI
Rms voltage for AC insulation test, 50 Hz, 1 min
Impulse withstand voltage 1.2/50 µs
Creepage distance
Clearance
Comparative Tracking Index (group IIIa)
2.5
16
Min
19.5
19.5
175
kV
kV
mm
mm
Applications examples
According to EN 50178 and IEC 61010-1 standards
and following conditions:
● Over voltage category OV 3
● Pollution degree PD2
● Non-uniform field
EN 50178
dCp, dCI,
V
w
Basic insulation
Reinforced insulation
Rated insulation voltage
1600 V
800 V
IEC 61010-1
Nominal voltage
1600 V
800 V
Safety
This transducer must be used in electric/electronic equipment with respect
to applicable standards and safety requirements in accordance with the
manufacturer’s operating instructions.
Caution, risk of electrical shock
When operating the transducer, certain parts of the module can carry hazardous
voltage (eg. primary busbar, power supply).
Ignoring this warning can lead to injury and/or cause serious damage.
This transducer is a build-in device, whose conducting parts must be inaccessible
after installation.
A protective housing or additional shield could be used.
Main supply must be able to be disconnected.
Page 2/3
9November2011/version 5
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
www.lem.com
Dimensions LA 25-NP/SP7
(in mm)
Connection
Mechanical characteristics
● General tolerance
● Fastening & connection of primary
● Fastening & connection of secondary
● Recommended PCB hole
± 0.2 mm
2 pins
0.635 x 0.635 mm
3 pins Ø 1 mm
1.2 mm
Remark
●
I
S
is positive when
I
P
flows from terminal + to terminal -.
Page 3/3
9November2011/version 5
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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