Brochure

3RV1 Circuit Breaker/MSP
SIRIUS System Manual
2-10 GWA 4NEB 430 0999-02 DS 01
2.2.3 Information on configuration
Short-circuit protection The short-circuit releases of the 3RV1 circuit breaker/MSPs execute a three-
phase isolation of the faulty branch circuit from the network and prevent any
further damage.
With a short-circuit breaking capacity of 50 kA or 100 kA a voltage
of 400 VAC, the switches are considered to be short circuit-proof, since
higher 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
breaker/MSPs.
You will find the short-circuit breaking capacity for other voltages and the
sizing of any required fuse listed in Section 2.7, Technical specifications.
Conditions of applica-
tion
3RV1 circuit breaker/MSPs are climate-proof. They are intended for use in
closed areas where there are no hazardous operating conditions such as
dust, corrosive fumes or destructive gases.
Appropriate housings are available as an accessory for use in dusty and
damp areas (see Section 2.4).
Selection Operational currents and starting currents can vary even in motors of the
same power. The motor powers listed in the tables are to serve only as
guide values. Most important when selecting the correct circuit breaker/
MSPs are the specific starting data and rating of the motor to be protected.
This also applies to circuit breaker/MSPs used for transformer protection.
Phase loss
sensitivity
The phase loss sensitivity of the circuit breaker/MSP ensures that it trips in
the event of the loss of a phase and the resulting overcurrents in the other
phases.
During normal operation, the device should have a three-pole load. To pro-
tect single-phase loads or direct current loads, all 3 main conducting paths
should be switched in series
Explosion protection Note
In the case of a three-pole load, at 3 to 8 times the set current, the release
time deviates by a maximum of ± 20% and therefore complies with the
requirement of DIN VDE 0165 and EN 50019.
The 3RV10 circuit breakers (MSP) for motor protection, CLASS 10, and the
3RV11 circuit breakers for motor protection with overload relay function,
CLASS 10, have ATEX-Approval according to EU-requirement 94/9/EG (DMT-
Certificate).