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3RV1 Circuit Breaker/MSP
SIRIUS System Manual
2-16 GWA 4NEB 430 0999-02 DS 01
2.3.6 Switching direct current
The 3RV1 circuit breaker/MSPs for alternating current are suitable for
switching direct current. However, you must note the maximum permissible
DC voltage per conducting path. In the case of higher voltages, series con-
nection of 2 or 3 conducting paths is required.
Response thresholds The response thresholds of the overload releases remain unchanged. The
response thresholds of the short-circuit releases are increased with direct
current by approximately 40 %.
The following table lists suggestions for switching direct current:
Double ground fault Note
In the case of the circuit with 2-pole switching and an ungrounded system, it
is assumed that even in the event of a double ground fault that bridges two
contacts, safe disconnection still occurs.
2.3.7 Main and emergency stop switches
Since the circuit breaker/MSPs meet the requirements for disconnectors in
acc. with IEC 60947-3 and the additional test requirements for circuit
breaker/MSPs with disconnector features in acc. with IEC 60947-2, they can
be used with the appropriate accessories as main and emergency stop
switches. They must also comply with DIN VDE 0113.
Suggestion
circuit
breaker/
MSP
Frame
size
Max.
permissible
direct voltage
E
I
Meaning
3RV1. S00 to
S3
DC 150 V 2-pole switching
Ungrounded system
If a ground fault can be excluded, or if every
ground fault is immediately corrected
(ground-fault monitoring), the maximum per-
missible DC voltage can be tripled.
3RV1. S00 to
S3
DC 300 V 2-pole switching
Grounded system
The grounded pole must always be assigned
to the individual conducting path so that in
the event of a ground fault there are always
2 conducting paths in series.
3RV1. S00 to
S3
DC 450 V 1-pole switching
Grounded system
3 conducting paths in series.
The grounded pole should be assigned to
the non switched conducting path.
Table 2-4: Suggestions for switching direct current
L-
M
L
+
L-
L
M
+
L-L
M
+