Current Transducer LA 125-P
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).
Electrical data
IPN Primary nominal r.m.s. current 125 A
IPPrimary current, measuring range 0 .. ± 200 A
R M Measuring resistance @ TA = 70°C TA = 85°C
RM min RM max RM min RM max
with ± 12 V @ ± 125 A max 552 14 50 Ω
@ ± 200 A max 520 14 18 Ω
with ± 15 V @ ± 125 A max 25 74 40 72 Ω
@ ± 200 A max 25 34 40 1) 40 1) Ω
ISN Secondary nominal r.m.s. current 125 mA
K N Conversion ratio 1 : 1000
VCSupply voltage (± 5 %) ± 12 .. 15 V
ICCurrent consumption 16 (@ ± 15 V) + ISmA
VdR.m.s. voltage for AC isolation test, 50 Hz, 1 mn 3kV
Accuracy - Dynamic performance data
XAccuracy @ IPN , TA = 25°C @ ± 15 V (± 5 %)± 0.60 %
@ ± 12 .. 15 V (± 5 %)± 0.80 %
εLLinearity < 0.15 %
Typ Max
IOOffset current @ IP = 0, TA = 25°C ± 0.40 mA
IOM Residual current 2) @ IP = 0, after an overload of 3 x IPN ± 0.50 mA
IOT Thermal drift of IO0°C .. + 70°C ± 0.15 ± 0.50 mA
- 25°C .. + 85°C ± 0.15 ± 0.60 mA
tra Reaction time @ 10 % of IP max < 500 ns
trResponse time 3) 4) @ 90 % of IP max < 1 µs
di/dt di/dt accurately followed 4) > 200 A/µs
fFrequency bandwidth 4) (- 1 dB) DC .. 100 kHz
General data
TAAmbient operating temperature - 25 .. + 85 °C
TSAmbient storage temperature - 40 .. + 90 °C
R S Secondary coil resistance @ TA = 70°C 32 Ω
TA = 85°C 33.5 Ω
mMass 40 g
Standards 5) EN 50178
Notes : 1) Measuring range limited to ± 180 A max
2) The result of the coercive field of the magnetic circuit
3) With a di/dt of 100 A/µs
4) The primary conductor is best filling the through-hole and/or the return
of the primary conductor is above the top of the transducer
5) A list of corresponding tests is available
Features
• Closed loop (compensated) current
transducer using the Hall effect
• Printed circuit board mounting
• Insulated 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.
IPN =125 A
980716/5
LEM Components www.lem.com
Secondary terminals
Terminal -:supply voltage -12 .. 15 V
Terminal M:measure
Terminal +:supply voltage +12 .. 15 V
Terminal :NC
Connection
Remarks
• IS is positive when IP flows in the direction of the arrow.
• Temperature of the primary conductor should not exceed
90°C.
• Dynamic performances (di/dt and response time) are best
with a primary bar in low position in the through-hole.
• In order to achieve the best magnetic coupling, the primary
windings have to be wound over the top edge of the device.
• This is a standard model. For different versions (supply
voltages, turns ratios, unidirectional measurements...),
please contact us.
Mechanical characteristics
• General tolerance ± 0.2 mm
• Primary through-hole 17 x 11 mm
• Fastening & connection of secondary 4 pins 0.63 x 0.56 mm
Recommended PCB hole 0.9 mm
• Supplementary fastening 2 holes ∅ 1.75 mm
Recommended PCB hole 2.4 mm
Recommended screws KA 22 x 6
LEM code 47.30.60.006.0
Dimensions LA 125-P (in mm. 1 mm = 0.0394 inch)
Bottom view
Front view
Left view
swiss
made
Standard 00
or N° SP.. Year Week
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
