Specifications

AS-Interface Slaves
Motor starters for operation in the control cabinet
3RA6 compact feeders
General data
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Siemens IK PI · 2009
6
■ Overview
3RA6 fuseless compact feeders and infeed system for 3RA6
Integrated functionality
The SIRIUS 3RA6 compact feeders are a generation of innova-
tive load feeders with the integrated functionality of a circuit
breaker, contactor and solid-state overload relay. In addition,
various functions of optional mountable accessories
(e.g. auxiliary switches, surge suppressors) are already inte-
grated in the SIRIUS compact feeder.
Application
The SIRIUS compact feeders can be used wherever standard
induction motors up to 32 A (approx. 15 kW/400 V) are directly
started.
Low equipment variance
Thanks to wide setting ranges for the rated current and wide
voltage ranges, the equipment variance is greatly reduced
compared to conventional load feeders.
Very high operational safety
Through the high short-circuit breaking capacity and defined
shut-down when the end of service life is reached means that the
SIRIUS compact feeder achieves a very high level of operational
safety that would otherwise have only been possible with consid-
erable additional outlay. This sets it apart from devices with
similar functionality.
Safe disconnection
The auxiliary switches of the 3RA6 compact feeders are de-
signed as mirror contacts. It is thus possible to use the devices
for safe disconnection, e. g. emergency stops, up to Category 2
(EN 954-1) and together with other redundancy switching de-
vices up to Category 3 or 4.
Communications integration through AS-Interface
To enable communications integration through AS-Interface
there is an AS-i add-on module (also available as a version with
two local inputs for safe disconnection) which can be mounted
instead of the control circuit terminals on the SIRIUS compact
feeder.
The design of the AS-i add-on module permits a group of up to
62 feeders with a total of four cables to be connected to the con-
trol system. This reduces wiring work considerably compared to
the parallel wiring method.
Permanent wiring / easy replacement
Using the SIRIUS infeed system for 3RA6 it is possible to carry
out the wiring in advance without a compact feeder needing to
be connected.
A compact feeder is very easily replaced simply by pulling it out
of the device without disconnecting the wiring.
Even with screw connections or mounting on a standard mounting
rail there is no need to disconnect any wiring
(on account of the
removable main and control circuit terminals) in order to replace
a compact feeder.
Consistent solution from the infeed to the motor feeder
The SIRIUS infeed system for 3RA6 with integrated PE bar is
offered as a user-friendly possibility of feeding in summation
currents up to 100 A with a maximum conductor cross-section
of 70 mm² and connecting the motor cable directly without addi-
tional intermediate terminals.
Screw and spring-loaded connections
The SIRIUS compact feeders and the SIRIUS infeed system for
3RA6 are available with screw and spring-type connections.
System configurator for engineering
A free system configurator is available to reduce further the
amount of engineering work for selecting the required compact
feeders and matching infeed.
Types of infeed for the 3RA6 fuseless compact feeders
On the whole four different infeed possibilities are available:
• Parallel wiring
• Use of 3-phase busbars (combination
with SIRIUS circuit
breakers and SIRIUS contactors possible)
• 8US busbar adapters
• SIRIUS infeed system for 3RA6
To comply with the clearance and creepage distances
demanded according to UL508 there are the following infeed
possibilities:
SIRIUS 3RA6 compact feeders
The SIRIUS 3RA6 compact feeders are universal motor feeders
according to IEC/EN 60947-6-2. As control and protective
switching devices (CPS) they can connect, convey and discon-
nect the thermal, dynamic and electrical loads from short-circuit
currents up to I
q
= 53 kA, i.e. they are practically weld-free. They
combine the functions of a circuit breaker, a contactor and a
solid-state overload relay in a single enclosure and can be used
wherever standard induction motors up to 32 A (up to approx.
15 kW at 400 V AC) are started directly. Direct-on-line and re-
versing starters are available as variants.
The reversing starter version comes with not only an internal
electrical interlock but also with a mechanical interlock
to prevent
simultaneous actuation of both directions of rotation.
Type of infeed Feeder terminal
(according to UL 508,
type E)
Order No.
Parallel wiring
Terminal for "Self-
Protected Combination
Motor Controller
(Type E)"
3RV19 28-1H
3-phase busbars
3-phase infeed
terminal for construct-
ing "Type E Starters",
UL 508
3RV19 25-5EB
Infeed systems for
3RA6
Infeed on left,
50/70 mm
2
, screw
terminal with 3 sockets,
outgoing terminal with
screw/spring-loaded
connections,
including PE bar
3RA68 13-8AB
(screw terminals),
3RA68 13-8AC
(spring-loaded
terminals)