
20/89 Device handbook A
PLUS
with / without LED display
,
157
679-19, 04/2016
Four wire system, unbalanced load
4L.Ub
Direct connection
L1
L2
L3
N
I1
I2
I3
l
l
l
l
k
k
k
A
PLUS
L1
L2
L3
N
With current and 3 single-pole isolated voltage
transformers
L1
L2
L3
N
I1
I2
I3
l
l
l
l
k
k
k
A
PLUS
K
k
L
l
K
k
L
l
K
k
L
l
L1
L2
L3
N
X
U
X
U
X
U
x
x
x
u
u
u
With current transformers
L1
L2
L3
N
I1
I2
I3
l
l
l
l
k
k
k
A
PLUS
K
k
L
l
K
k
L
l
K
k
L
l
L1
L2
L3
N
Four wire system, unbalanced load, Open-Y
4L.UY
Direct connection
L1
L2
L3
N
I1
I2
I3
l
l
l
l
k
k
k
A
PLUS
L1
L2
L3
N
With current and 2 single-pole isolated voltage
transformers
L1
L2
L3
N
I1
I2
I3
l
l
l
l
k
k
k
A
PLUS
K
k
L
l
K
k
L
l
K
k
L
l
L1
L2
L3
N
X
U
X
U
x
x
u
u
With current transformers
L1
L2
L3
N
I1
I2
I3
l
l
l
l
k
k
k
A
PLUS
K
k
L
l
K
k
L
l
K
k
L
l
L1
L2
L3
N