SIEMENS
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Siemens IC 10 · 2017
Load Feeders and Motor Starters for Use in the Control Cabinet
SIRIUS 3RA2 Load Feeders
3RV29 infeed system for load feeders
8
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Overview
Types of infeed for 3RA2 fuseless load feeders
On the whole four different power infeed possibilities are
available:
•
Parallel wiring
•
Use of three-phase busbars (combination with SIRIUS motor
starter protectors and contactors possible)
•
8US busbar adapters
•
SIRIUS 3RV29 infeed systems
Insulated three-phase busbar system
Three-phase busbar systems provide an easy, time-saving and
clearly arranged means of feeding 3RA2 load feeders with
screw terminals. Different versions are available for sizes S00
and S0 and can also be used for the various different types of
motor starter protectors.
The busbars are suitable for between two and five feeders.
However, any kind of extension is possible by clamping the tags
of an additional busbar (rotated by 180°) underneath the termi-
nals of the respective last motor starter protector.
A combination of feeders of different sizes is possible with sizes
S00 and S0. Connecting pieces are available for this purpose.
The motor starter protectors/circuit breakers are supplied by
appropriate infeed terminals.
SIRIUS three-phase busbar system size S00/S0
The three-phase busbar systems are finger-safe. They are de-
signed for any short-circuit stress which can occur at the output
side of connected motor starter protectors.
The three-phase busbar systems can also be used to construct
"Type E Starters" of size S0 or S2 according to UL/CSA. However,
special infeed terminals must be used for this purpose;
see page 7/41
.
8US busbar adapters for 60 mm systems
The load feeders are mounted directly with the aid of busbar
adapters on busbar systems with 60 mm center-to-center
clearance in order to save space and to reduce infeed times and
costs.
The busbar adapters for busbar systems with 60 mm center-to-
center clearance are suitable for copper busbars with a width of
12 to 30 mm. The busbars can be 4 to 5 mm or 10 mm thick.
The feeders are snapped onto the adapter and connected on
the line side. This prepared unit is then plugged directly onto the
busbar system, and is thus connected both mechanically and
electrically at the same time.
For "Selection and ordering data",
see page 8/53
.
SIRIUS load feeders with busbar adapters snapped onto busbars
SIRIUS 3RV29 infeed system
The 3RV29 infeed system is a convenient means of energy
supply and distribution for a group of several motor starter
protectors or complete load feeders with a screw or spring-type
connection up to size S0.
The system is based on a basic module complete with a lateral
incoming unit (three-phase busbar with infeed) which has two
slots.
Expansion modules are available for extending the system
(three-phase busbars for system expansion).
For the 3RV29 infeed system,
see page 7/55
.
NSB0_02079c
3RV1915-6AB
3RV2915-5B
3RV2925-5AB
3RV1915-1CB
NSB0_02080a
© Siemens AG 2016