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Short-circuit protection
Fuse data for transformer and contactor according to IEC 60947-4 and DIN VDE 0660 Part 104
Working range
Current
of transformer
transformer
[A]
3UF18 47
16 to 65
3UF18 48
25 to 100
3UF18 50
32 to 130
3UF18 52
50 to 200
3UF18 54
63 to 250
3UF18 56
100 to 400
3UF18 57
125 to 500
3UF18 68-3F
160 to 630
3UF18 68-3G
205 to 820
*) Suitable for use on a circuit capable of delivering not more than x RMS symmetrical amperes.
Connection
Terminal screws which are not used must be tightened as well.
Terminals of the 3UB11 are suitable only for connection of one conductor. Terminals are therefore connected via fitted bridge.
Double contactors should be compressed, for example, with a terminal pin.
Use 75 °C copper wire only.
Permissible cross-sections for primary conductors
Current transformer
2
solid [mm
]
2
stranded [mm
]
2
finely stranded [mm
] without end
1)
sleeve
2
finely stranded [mm
] with end sleeve
AWG wires, solid and stranded
stripping length [mm]/[inch]
2
finely stranded [mm
], with cable lug
2
stranded [mm
], with cable lug
terminal screws
tightening torque [Nm]/[lb·in]
flat terminal [mm]
1)
The ends of non-stranded cables must be twisted or 18 mm long end sleeves must be used.
2)
Use cover 3TX7506-0A for oversized cable lugs.
3)
2 conductors connected max. 3 to 2/0
3ZX1012-0UF18-1BA1
Rated operating current
Type of
I
e
contactor
3TF46
3TF47
3TF48
3TF49
3TF50
3TF51
3TF52
3TF53
3TF54
3TF55
3TF56
3TF57
3TF68
3TF69
without box termi-
nal
3UF1847
3UF1850
3UF1848
—
—
—
—
—
—
—
—
7 to 1/0
3 to 2/0
—
—
2)
10 to 35
16 to 70
2)
10 to50
25 to 70
M 6
M 6
4 to 6/
6 to 8/
36 to 52
52 to 70
12 x 3
15 x 3
NH. Type
3NA
AC3
gL
[A]
1
2
45
160
100
63
160
125
75
250
160
85
250
160
110
315
224
140
315
224
170
355
224
205
355
224
250
500
400
300
500
400
400
800
500
475
800
500
630
1000
500
820
1000
630
Box terminal can be fitted
with box terminal 3UF18 47 and 3UF18 48
one terminal connected
6 to 16
2,5 to 16
16 to 50
2,5 to 50
10 to 35
2,5 to 35
6 to 35
2,5 to 35
10 to 1/0
18 to 1/0
18 to 20/¾
—
—
M 6
4 to 6/
36 to 52
—
Maximum fuse ratings
NH. Type
BS 88 Type T
3ND
aM
2
1
80
160
80
160
125
250
125
250
125
315
125
315
160
355
160
355
400
500
400
500
630
800
400
800
630
1000
630
1000
two terminals
connected
max. 2 x 16
max. 2 x 35
max. 2 x 25
max. 2 x 25
max. 2 x 1/0
18 to 20/¾
—
—
M 6
4 to 6/
36 to 52
—
X*)
RMS
2
[A]
80
10000
100
160
10000
160
200
10000
200
18000
250
250
18000
355
355
30000
450
450
30000
500
42000
630
42000
3UF1850
—
max. 2 x 25 to 70
max. 2 x 25 to 50
max. 2 x 25 to 50
3)
max. 2 x 2 to 2/0
22 to 25/1
—
—
M 6
6 to 8/
52 to 70
—
5
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