BCU 460, BCU 465 · Edition 11.19 123
Project planning information
14.3.1 Safety current inputs
Actuation of the safety current inputs only with switch-
gear featuring mechanical contacts. If switchgear with
semi-conductor contacts is used, the safety current
inputs must be connected using relay contacts.
To safeguard the safety current inputs, the fuse must be
designed so that the sensor with the lowest switching
capacity is protected.
The cabling outside enclosed installation spaces must
be protected from mechanical damage and stress (e.g.
vibration or bending) as well as short-circuits, short-
circuits to ground and cross-circuits.
LM 400..F3
PE
L
N
L1
N
PE
61 31
V2
60 30
V1
62 32
V3
N
28
L
58
37
TC
N
27
L
57
36
N
29
L
59
38
F3 3,15 A
O
I
UA-Sk
V1 V2 V3
82 81 80 95 96 97
51 21
BM
2322
85 86 87
92 91 90
54 24
N1
52 53
BM
55 25
N1
56 26
N1
1
N1
N1
N1
N1
N1
N1
N1
N1
p
U
2
230 V
UVS
I
Z
3
1
2
4
6
5
7
40 41
35
39
P
LDS
Start 1
A
HT
PE PE PE PE
PE
65 34 66
v
Luft
N1
67
DW 2DW 1
PE PE
menox
BCU 465
F 3,15 A
F1
(BCU..E1)
F2
(BCU..E0)
3 6
7
35
39
P
LDS
HT
menox
0,6 × I
N
Calculation
I
N
= current of the sensor/contactor with the lowest
switching capacity
Suitable fuse = 0.6 × I
N
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