Datasheet

3RV Motor Starter Protectors/Circuit Breakers up to 100 A
9
Siemens · 2010
General data
Switching of direct current
3RV1 motor starter protectors for alternating currents are also
suitable for DC switching.
The maximum permissible DC voltage per conducting path
must, however, be adhered to. Higher voltages require a series
connection with 2 or 3 conducting paths.
The response values of the overload release remain unchanged;
the response values of a short-circuit release increase by appro-
ximately 30 % for DC. The example circuits for DC switching can
be seen in the table below.
Example circuit for size S00 to S3 3RV1 motor starter protectors
1) It is assumed that this circuit always provides safe disconnection even in
the event of a double ground fault that bridges two contacts.
3RV16 voltage transformer circuit breakers up to 3 A
The voltage transformer circuit breaker protects the secondary
side of voltage transformers used to connect protection equip-
ment with voltage-dependent starting. The circuit breaker is
used for distance protection with low-impedance starting. Spe-
cial auxiliary contacts reliably prevent low-impedance starting
from triggering distance protection if only one fault has occurred
in the transformer line.
The voltage transformer circuit breaker can also be used to sa-
fely disconnect the distance protection device from the voltage
transformer. In this case, the special auxiliary contacts also pre-
vent false tripping of the distance protection.
Additional fuses are not required. A "Fuse Failure Monitor" (FFM)
is also not required.
Example circuit for size S00
to S3 3RV1 motor starter protectors
Maximum permitted
DC voltage U
e
Notes
150 V DC Three-pole switching, non-grounded system
1)
If there is no possibility of a ground fault, or if every ground fault is rectified immediately
(ground-fault monitoring), then the maximum permitted DC voltage can be tripled.
300 V DC Two-pole switching, grounded system
The grounded pole is always assigned to the individual conducting path, so that there
are always 2 conducting paths in series in the event of a ground fault.
450 V DC Single-pole switching, grounded system
3 conducting paths in series. The grounded pole is assigned to the unconnected con-
ducting path.
NSB0_00001a
M
L+ L
NSB0_00002a
M
L+ L
NSB0_00003a
M
L+
L