Figure 2-8: Circuit Breaker With Overload Relay Function (Frame Sizes S0 To S3) - Siemens sirius System Manual

3RV1 circuit breakers
2.3.4 Circuit breakers with overload relay function
Description
Fixed link: auxiliary
contacts with circuit
breaker
Diagrams
2.3.5 Fuse monitoring
2-14
Circuit breakers with the 3RV11 overload relay function are available for
frame sizes S0, S2, and S3.
Circuit breakers with the overload relay function contain overload releases
that do not affect the breaker mechanism of the circuit breakers. In the
event of an overload, the circuit breaker remains switched on.
To protect the following loads, 2 auxiliary contacts (1S + 1Ö) are attached on
the right side. These are operated in the event of an overload. The auxiliary
switch function can be evaluated or used to disconnect a downstream con-
tactor. After the circuit breaker has cooled down, the auxiliary contacts are
reset automatically.
Caution
In the overload range, the circuit breaker does not protect itself with the
overload relay function. You must therefore ensure that the circuit breaker is
safely disconnected by means of a downstream switching device (e.g. a
contactor).
Note:
The auxiliary contacts are connected to the circuit breaker on the right side
and cannot be removed.
S0: 3RV1121-....
TEST

Figure 2-8: Circuit breaker with overload relay function (frame sizes S0 to S3)

The 3RV16 11-0BD10 circuit breaker is used with frame size S00 for fuse
monitoring.
A conducting path of the circuit breaker is switched in parallel for each fuse.
If one fuse fails, the current flows via the parallel-switched conducting path
of the circuit breaker and trips it.
S2:
3RV1131-....
TEST
S3: 3RV1141-....
TEST
SIRIUS System Manual
GWA 4NEB 430 0999-02b