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3RV1 Circuit Breaker/MSP
SIRIUS System Manual
GWA 4NEB 430 0999-02 DS 01
2-15
Auxiliary switch func-
tions
The circuit breaker/MSP used for fuse monitoring can be equipped with a
transverse or lateral auxiliary switch (Section 2.4, Accessories). The auxiliary
switch reports the tripping of the circuit breaker/MSP and thus the failure of
the fuse and initiates an all-pole disconnection of the problem circuit by a
corresponding switching device.
Safety sign
Note
When fuses used for isolation purposes are monitored, a warning sign must
be put up next to them. Via the parallel-switched voltage circuit of the moni-
toring facility, voltage may get into the area that is supposed to be isolated if
the monitoring equipment has not been disconnected.
We suggest the following text for the warning:
Voltages The 3RV16 11-0DB10 circuit breaker/MSP is suitable for fuse monitoring in
the following voltage ranges:
• 24 to 690 VAC, 50/60
Hz
• 24 to 250 VDC, 100 to 600 VDC
Switching capacity I
CN
100 kA
Circuit diagrams
Fig. 2-9: Circuit diagrams of circuit breaker/MSPs for fuse monitoring
Parallel cables/meshed
networks
Attention
In the case of parallel cables and meshed networks, a tripping operation and
signal only occurs when the voltage difference at the circuit breaker/MSP is
at least 24 V.
Attention
To ensure isolation, also disconnect
the fuse-monitoring device with the
item designation............
U
e
AC 24 ... 690V DC 24 ... 250V DC 100 ... 600V
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