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3RV1 circuit breakers
SIRIUS System Manual
2-10
GWA 4NEB 430 0999-02b
Testing overload
tripping
The following table shows you how overload tripping of the circuit breaker is
tested:
Table 2-3: Testing overload tripping (example: frame size S00)
2.2.3 Information on configuration
Short-circuit protection
The short-circuit releases of the 3RV1 circuit breakers execute a three-phase
isolation of the faulty load feeder from the network and prevent any further
damage.
With a short-circuit breaking capacity of 50 kA or 100 kA and a voltage
of 400 VAC, the switches are considered to be short circuit-proof, since hig-
her short-circuit currents are not to be expected where the switches are
installed.
Backup fuses are only required if the short-circuit current at the point of
installation exceeds the rated short-circuit breaking capacity of the circuit
breakers.
You will find the short-circuit breaking capacity for other voltages and the
size of any required fuse listed in Section 2.6, Technical specifications.
Conditions of applica-
tion
3RV1 circuit breakers are climate-proof. They are intended for use in closed
areas where there are no harzardous operating conditions such as dust, cor-
rosive fumes or destructive gases.
Appropriate housings are available as an accessory for use in dusty and
damp areas (see Section 2.4).
Inrush current
Because the operational currents, the starting currents and the current
spikes vary on account of the inrush current, even in motors of the same
power, the motor powers listed in the tables are only guide values. Most
important when selecting the correct circuit breakers are the concrete start-
ing data and rating of the motor to be protected. This also applies to circuit
breakers used for transformer protection.
Drawing
Step
Procedure
1
Switch the toggle switch/rotary
switch from 0 to 1.
2, 3
Put a screwdriver in the test
opening and push it to the left.
Overload tripping is in working
order when the toggle switch
switches from 1 to 0 (frame
size S00) or goes into the trip-
ped position (frame sizes S0 to
S3).
2
3
1