Siemens SENTRON - Troubleshooting

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5.6 Troubleshooting
If a residual current protective device trips, the  rst troubleshooting step should be
to follow the procedure outlined in the diagram below ( gure 24).
Notes on installation and use
Figure 24: Troubleshooting  owchart
Reclose RCCB if installation
unchanged
RCCB has tripped;
insulation fault in the
installation
Can the RCCB be closed?Yes
Open all fuses and miniature
circuit breakers downstream
of the RCCB.
Temporary fault.
Test the insulation
of the installation
and loads. Including
N-PE.
Can the RCCB be closed?
NoYes
Switch each circuit on again
in sequence until the RCCB
trips. The circuit on which
the RCCB trips has an
insulation fault. To further
pinpoint the fault: switch
off all loads in this circuit
and/ or disconnect the
power plugs.
Can the RCCB be closed?
No
Disconnect the outgoing
terminal of the RCCB.
No Yes
Can the RCCB be closed?
RCCB is
faulty.
Insulation
fault be-
tween the
RCCB and
the fuses or
miniature
circuit
breakers or
in the N.
The fault is located in the
 xed-mounting cable of this
circuit. Pinpoint the fault by
measuring the insulation and
disconnecting the cable in
the tapping boxes.
Switch each load on again
in sequence or plug in the
plugs until the RCCB trips.
The device on which the
RCCB trips is faulty.
Yes