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

070103/11

Current Transducer LA 55-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

I

PN

Primary nominal current rms

50

A

I

PM

Primary current, measuring range

0 .. ± 70

A

R

M

Measuring resistance @

T

T

R

with ± 12 V

@ ± 50 A

maxi

10

100

60

95

Ω

@ ± 70 A

maxi

10

50

Ω

with ± 15 V

@ ± 50 A

maxi

50

160

135 155

Ω

@ ± 70 A

maxi

50

90

Ω

I

SN

Secondary nominal current rms

50

mA

K

N

Conversion ratio

1 : 1000

V

C

Supply voltage (± 5 %)

± 12 .. 15

V

I

C

Current consumption

V

d

Rms voltage for AC isolation test, 50 Hz, 1 min

2.5

kV

Accuracy - Dynamic performance data

X

Accuracy @ I

@ ± 15 V (± 5 %)

± 0.65

%

@ ± 12 .. 15 V (± 5 %)

± 0.90

%

ε

L

Linearity error

< 0.15

%

Typ

Maxi

I

O

Offset current @ I

± 0.2

mA

I

OM

after an overload of 3 x I

PN

± 0.3

mA

I

OT

Temperature variation of I

O

0°C .. + 70°C

± 0.1

± 0.5

mA

- 25°C .. + 85°C

± 0.1

± 0.6

mA

t

ra

Reaction time @ 10 % of I

PN

< 500

n s

t

r

Response time @ 90 % of I

< 1

µs

di/dt

di/dt accurately followed

> 200

A/µs

BW

Frequency bandwidth (- 1 dB)

DC .. 200

kHz

General data

T

A

Ambient operating temperature

- 25 .. + 85

°C

T

S

Ambient storage temperature

- 40 .. + 90

°C

R

S

Secondary coil resistance @

T

80

Ω

T

85

Ω

m

Mass

18

g

Standards

EN 50178: 1997

maxi

maxi

Features

transducer using the Hall effect

according to UL 94-V0.

Advantages

interference

Applications

motor drives

(UPS)

(SMPS)

applications.

Application Domain

I

PN

=

50 A

16019