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3RV1 Circuit Breaker/MSP
SIRIUS System Manual
2-14 GWA 4NEB 430 0999-02 DS 01
2.3.4 Motor protection with overload relay function
3RV11 circuit breakers/MSPs with the overload relay function are available
for frame sizes S0, S2, and S3.
Description The 3RV11 devices have the same overload and short-circuit trip characteris-
tics as the 3RV10. However the overload release doesn’t effect the switch-
ing mechanism of the circuit breaker/MSP. In the event of an overload, the
circuit breaker/MSP remains switched on.
The overload release uses two side mounted auxiliary contacts
(1NO + 1NC), that switch in the event of an overload. The auxiliary contacts
can be used for signalling or can be used to disconnect a downstream con-
tactor. After the circuit breaker/MSP has cooled down, the auxiliary contacts
are reset automatically.
Caution
In the overload range, the circuit breaker/MSP does not protect itself with
the overload relay function. You must therefore ensure that the power is
safely disconnected by means of a downstream switching device (e.g. a
contactor).
Fixed link: auxiliary
contacts with circuit
breaker/MSP
Note
The auxiliary contacts are factory mounted to the 3RV11 circuit breaker/MSP
on the right side and cannot be removed.
Diagrams
Fig. 2-8: Circuit breaker/MSP with overload relay function (frame sizes S0 to S3)
2.3.5 Fuse monitoring
The 3RV16 11-0BD10 circuit breaker/MSP is used with frame size S00 for
fuse monitoring.
A conducting path of the circuit breaker/MSP is switched in parallel for each
fuse. If one fuse fails, the current flows via the parallel-switched conducting
path of the circuit breaker/MSP and trips it.
Warning
Fuse monitoring using the 3RV16
11-0DB10 circuit breaker/MSP is not per-
missible in feeders with power control regulators where a DC feedback with
higher values can occur in the event of a fault.
S0: 3RV11 21-.... S2: 3RV11 31-.... S3: 3RV11 42-....
TEST
RV-00588
TEST
R
V
-
0
0
5
8
9
TEST