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| | Switching with SIRIUS means high contact reliability and increased
service life and application options under extreme conditions.
Key features of the SIRIUS system: all devices are suitable as stand-alone
devices, as modules for complete load feeders and for installation in
low-voltage distribution boards/switchgear.
OVERLOAD RELAY
| Thermal and electronic overload relay 3RU11 and
3RB10 |
SIRIUS overload relays are available in a thermal version and also in a solid-
state version for higher requirements. They have the function of providing cur-
rent-dependent overload protection for loads (e.g motors) in the main circuit as
well as the other switching and protective devices in the load feeder.
SIRIUS overload relays can be used to configure compact load feeders and that
quite simply and in a space-saving fashion. This is because the overload relays
are optimally harmonized to the other components (contactors, soft starters
etc.) of the modular SIRIUS system - electrically, mechanically and as far as
the optical design is concerned.
The modular SIRIUS system also includes standard accessories, which are used
independent of the size and which match the 3RU11 thermal overload re- lay and
the 3RB10 solid-state overload relay. This significantly simplifies engi-
neering and minimizes stock inventory costs.
| Higher requirements: Protect with 3RB12 |
Our 3RB12 solid-state overload relays offer an even higher degree of functiona-
lity and protection for full motor protection: These devices additionally
protect your loads as a function of the temperature by using a PTC thermistor
sensor circuit which is connected to the device. The PTC sensor measures the
tempe- rature directly in the motor windings and the signals are evaluated by a
relay. As a result of this integrated evaluation unit it is often not necessary
to use an additional temperature evaluation device (e.g thermistor motor
protection de- vice or temperature monitoring relay). This also means that no
special wiring is required. Beyond this, the 3RB12 relay allows the plant or
system to be protec- ted against the consequences of a ground fault using its
internal and external ground fault sensing.
Furthermore, the 3RB12 outputs an analogue signal indicating the measured motor
current.
 The
SIMOCODE-DP motor protection and control device is the right selection if you
require, in addition to the features of the 3RB12, even more comprehensive
control functions, user-friendly diagnostic capabilities and high performance
communications via PROFIBUS-DP.
CIRCUIT BREAKER
SIRIUS 3RV circuit-breakers are compact, current-limiting circuit-breakers. They
ensure safe shutdown in the event of a short-circuit and protect loads and
plants against overload. Furthermore, they are also suitable for manually
switching loads under field conditions and safely isolating the plant from the
main power supply when maintenance work or modifications need to be under-
taken.
Just like all SIRIUS devices, the circuit-breakers are suitable for
side-by-side mounting up to 60 °C. In addition to the usual CLOSED/OPEN
circuit-breaker positions the TRIPPED position is also indicated. SIRIUS
circuit-breakers can be connected easily and without any wiring to the SIRIUS
contactors and soft starters through a link module.
The clear, structured range is electrically, mechanically and optically harmo-
nized to the other families of SIRIUS devices - contactors soft starters and
overload relays. Furthermore, the four sizes cover a current range up to 100 A.
This corresponds to a power range up to 45 kW at 400 V AC.
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