Siemens SIRIUS 3RH Series - Operation of a Motor in Two Directions of Rotation (3 RA23 Reversing Contactor Assembly)

SIRIUS 3RT2 contactors/contactor assemblies
2.4 Configuration
SIRIUS Innovations
132 System Manual, 01/2011, A8E56203870002-03
2.4.9 Operation of a motor in two directions of rotation (3RA23 reversing contactor
assembly)
Applications
The 3RA23 reversing contactor assembly is used to operate a motor in two directions of
rotation. The starting characteristics correspond to those of a direct-on-line starter. When
used in conjunction with the relevant protective devices, they facilitate the space-saving and
compact assembly of fused and fuseless feeders.
On combinations with AC operation, 50/60 Hz, a changeover delay of 50 ms must be
provided at voltages ≥ 500 V. At voltages ≥ 400 V, a changeover delay of 30 ms is
recommended. These idle times do not apply to combinations with DC operation.
Versions
The 3RA23 reversing contactor assemblies are available with a uniform performance range
of 3 kW to 18.5 kW (utilization category AC-3). The 3RA23 reversing contactor assemblies
are 90 mm wide.
The diagram below shows the fully mounted 3RA23 reversing contactor assembly size S0
with a screw-type connection system.
Figure 2-8 Reversing contactor assembly with screw-type connection system (size S0)
Reference
More information ... Can be found in the chapter titled ...
About the individual components for customers to
assemble their own 3RA23 reversing contactor
assembly and how to mount said assembly.
Assembly kit for reversing contactor assemblies
(Page 212)
Rated powers
The performance range of the 3RA23 reversing contactor assembly in size S00 extends up
to 7.5 kW at a voltage of 400 V. In size S0, the maximum power value is 18.5 kW at a
voltage of 400 V.