LA55-TP_06 [LEM]
Current Transducer; 电流传感器
LEM 
Current Transducer LA 55-TP
IPN = 50 A
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).
16016
Electrical data
IPN
IP
RM
Primary nominal r.m.s. current
Primary current, measuring range
Measuring resistance @
50
0 .. ± 70
TA = 70°C
RM min RMmax RM min RMmax
A
A
Features
TA = 85°C
· Closed loop (compensated) current
transducer using the Hall effect
· Printed circuit board mounting
· Insulated plastic case recognized
according to UL 94-V0.
with ± 12 V
with ± 15 V
@ ± 50 A max
10 100 60 95
W
W
W
W
@ ± 70 A max
@ ± 50 A max
@ ± 70 A max
10
50
60 1) 60 1)
50 160 135 155
50
90 135 2)135 2)
Advantages
ISN
KN
VC
IC
Secondary nominal r.m.s. current
Conversion ratio
Supply voltage (± 5 %)
Current consumption
50
1 : 1000
± 12 .. 15
mA
· Excellent accuracy
· Very good linearity
V
10 (@ ±15V) + IS mA
· Low temperature drift
· Optimized response time
· Wide frequency bandwidth
· No insertion losses
· High immunity to external
interference
Accuracy - Dynamic performance data
X
Accuracy @ IPN , TA = 25°C
@ ± 15 V (± 5 %)
± 0.65
± 0.90
< 0.15
%
%
%
@ ± 12 .. 15 V (± 5 %)
e
Linearity error
L
· Current overload capability.
Typ Max
IO
IOM
IOT
Offset current @ IP = 0, TA = 25°C
± 0.2 mA
± 0.3 mA
± 0.1 ± 0.5 mA
± 0.1 ± 0.6 mA
Applications
Residual current3) @ IP = 0, after an overload of 3 x IPN
Thermal drift of IO
0°C .. + 70°C
- 25°C .. + 85°C
· AC variable speed drives and servo
motor drives
tra
tr
Reaction time @ 10 % of IP max
< 500
< 2.5
> 200
DC .. 100
ns
µs
A/µs
kHz
· Static converters for DC motor drives
· Battery supplied applications
· Uninterruptible Power Supplies
(UPS)
Response time 4) @ 90 % of IP max
di/dt di/dt accurately followed
f
Frequency bandwidth @ 30A (- 3 dB)
· Switched Mode Power Supplies
(SMPS)
· Power supplies for welding
applications.
General data
TA
TS
RS
Ambient operating temperature
Ambient storage temperature
Secondary coil resistance @
- 25 .. + 85
- 40 .. + 90
80
85
24
°C
°C
W
W
g
TA = 70°C
TA = 85°C
Application Domain
m
Mass
Standards
EN 50178 : 1997
· Industrial
1)
Notes : Measuring range limited to ± 60 A
max
max
2)
Measuring range limited to ± 55 A
Result of the coercive field of the magnetic circuit
With a di/dt of 100 A/µs.
3)
4)
060126/7
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
Page1/3
LEM
www.lem.com
Current Transducer LA 55-TP
Isolation characteristics
Vd
Vb
R.m.s. voltage for AC isolation test, 50 Hz, 1 mn
R.m.s. rated voltage
2.5
600
kV
V
Min
6.9
6.1
175
dCp
dCl
CTI
Creepage distance
Clearance distance
Comparative Tracking Index (Group IIIa)
m m
m m
Application 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
Rated isolation voltage
600 V
IEC 61010-1
Nominal voltage
600 V
dCp, dCI
Single isolation
Reinforced isolation
300 V
300 V
Safety
This transducer must be used in electric/electronic equipment with respect to
applicable standards and safety requirements in accordance with the following
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 built-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.
060126/7
Page 2/3
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
LEM
www.lem.com
Dimensions LA 55-TP (in mm. 1 mm = 0.0394 inch)
Bottom view
Left view
Connection
Standard 00
or N° SP..
Year Week
Front view
Mechanical characteristics
Remarks
· General tolerance
· Fastening & connection of primary
± 0.2 mm
bus bar
6.4 x 1.6 mm
3.8 mm
3 pins
0.63 x 0.56 mm
0.9 mm
· IS is positive when IP flows in the direction of the arrow.
· Temperature of the primary conductor should not exceed
90°C.
· This is a standard model. For different versions (supply
voltages, turns ratios, unidirectional measurements...),
please contact us.
Recommended PCB hole
· Fastening & connection of secondary
Recommended PCB hole
060126/7
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
Page3/3
LEM
www.lem.com
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