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3.3.3
Connection
Risk of injury through electric shock and damage to the device!
Bring the Bus Terminals system into a safe, de-energized state before starting mounting, disassembly or
wiring of the Bus Terminals!
Fig. 16: Connection
Terminal point
No.: Connection for
L1
1
Phase L1
L2
2
Phase L2
L3
3
Phase L3
N
4
Neutral conductor N (internally connected to terminal point I
capacitively connected to the grounding contact for the mounting rail)
I
5
Current transformer at L1
L1
I
6
Current transformer at L2
L2
I
7
Current transformer at L3
L3
I
8
Star point of the current transformers
N
(internally connected to terminal point N,
capacitively connected to the grounding contact for the mounting rail)
*) The KL3403-0026 has no capacitive connection to the grounding contact of the mounting rail!
Make sure terminal point N is zeroed or grounded!
If you do not connect the terminal point N with the neutral conductor of your mains supply (e.g. if the
KL3403 is used purely for current measurements [} 33]), terminal point N should be earthed, in order to
avoid dangerous overvoltages in the event of a current transformer fault!
KL3403
WARNING
,
N
CAUTION
Version: 3.1.0
Mounting and wiring
Comment
Connections for the voltage
measurement. (See note
[} 29] under Make sure ter-
minal point N is zeroed or
grounded!)
Connections for the current
transformers. (See note
[} 30] under Operate the
current transformer as in-
tended!)
29
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