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LA55-TP/SP27

Current Transducer

LEM Industrial 

Current Transducer LA 55-TP/SP27

For the electronic measurement of currents: DC, AC, pulsed...,

with galvanic isolation between the primary circuit (high power) and

the secondary circuit (electronic circuit).

IPN = 50 A

16086

Electrical data

IPN

Primary nominal current rms

IPM Primary current, measuring range

RM Measuring resistance

with ± 12 V

@ ± 50 A max

@ ± 100 A max

with ± 15 V

@ ± 50 A max

@ ± 100 A max

ISN

Secondary nominal current rms

KN Conversion ratio

VC

Supply voltage (± 5 %)

IC

Current consumption

Accuracy - Dynamic performance data

50

A

0 .. ± 100

A

R R M min

M max

0 210

Ω

0

30

Ω

30 320

Ω

30 90

Ω

25

mA

1 : 2000

± 12 .. 15

V

10 (@ ± 15 V)+ IS mA

X

Accuracy @ IPN , TA = 25°C @ ± 15 V (± 5 %)

@ ± 12 .. 15 V (± 5 %)

ε

L

Linearity error

± 0.65

± 0.90

< 0.15

Typ Max

IO

Offset current @ IP = 0, TA = 25°C

IOM

Magnetic offset current 1) @ IP = 0 and specified RM,

after an overload of 3 x IPN

IOT

Temperature variation of IO

- 25°C .. + 85°C ± 0.1

- 40°C .. - 25°C ± 0.2

± 0.1

± 0.2

± 0.3

± 0.5

tra

tr

di/dt

Reaction time to 10 % of IPN step

Response time 2) to 90 % of IPN step

di/dt accurately followed

< 500

< 1

> 200

BW Frequency bandwidth (- 1 dB) DC .. 200

%

%

%

mA

mA

mA

mA

ns

µs

A/µs

kHz

General data

TA

Ambient operating temperature - 40 .. + 85

°C

TS

Ambient storage temperature - 50 .. + 90

°C

RS Secondary coil resistance @ TA = 85°C 140

Ω

m

Mass 35

g

Standards EN 50155: 1995

Features

●● Closed loop (compensated)

current transducer using the Hall

effect

●● Mounted on printed circuit board

●● Insulated plastic case recognized

according to UL 94-V0.

Special features

●● IPM = 0 .. ± 100 A

●● KN = 1 : 2000

●● Vd = 3.6 kV

●● TA = - 40°C .. + 85°C

●● Potted.

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

●● Single or three phases inverter

●● Propulsion and braking chopper

●● Propulsion converter

●● Auxiliart converter

●● Battery charger.

Application domain

●● Traction.

Notes: 1) Result of the coercive field of the magnetic circuit

2) With a di/dt of 100 A/µs.

090616/4

LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.

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