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Siemens IC 10 · 2017
Contactor Assemblies for Star-Delta (Wye-Delta) Starting
SIRIUS 3RA24 contactor assemblies for star-delta (wye-delta) starting, up to 90 kW
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Overview
The 3RA24 contactor assemblies for star-delta (wye-delta)
starting in sizes S00 to S3 can be ordered as follows:
•
Fully wired and tested, with electrical and mechanical inter-
lock;
see page 3/179 onwards
•
For all individual parts for customer assembly,
see from page 3/75 onwards
.
The 3RA24 contactor assemblies for star-delta (wye-delta)
starting have screw or spring-type terminals and are suitable for
screwing and snapping onto TH 35 standard mounting rails.
A base plate is also available for the size S2 and S3 assemblies.
A dead interval of 50 ms on reversing is already integrated in the
3RA28 function module for star-delta (wye-delta) starting.
With the fully wired and tested 3RA24 contactor assemblies for
star-delta (wye-delta) starting, the auxiliary contacts included in
the basic units are unassigned.
The 3RA24 contactor assemblies for star-delta (wye-delta)
starting are designed for standard applications.
Note:
Contactor assemblies for star-delta (wye-delta) starting in
special applications such as very heavy starting
1)
or star-delta
(wye-delta) starting of special motors must be customized.
Help with designing such special applications is available from
our Technical Assistance,
Tel.: +49 (911) 895-5900
E-mail:
technical-assistance@siemens.com
1)
For effective support from Technical Assistance you must provide the
following details:
- Rated motor voltage
- Rated motor current
- Service factor, operating values
- Motor starting current factor
- Starting time
- Ambient temperature.
Surge suppression
Surge suppression (varistor) is included in the 3RA28 function
modules for star-delta (wye-delta) starting.
Motor protection
3RU2 overload relays
(see from page 7/84 onwards)
or
3RB3 overload relays
(see from page 7/97 onwards)
for contactor mounting or stand-alone installation,
SIMOCODE pro 3UF7 motor management and control devices
(from page 10/14 onwards)
or 3RN thermistor motor protection
evaluation units
(from page 10/164 onwards)
can be used for
motor protection.
The overload relay can be either mounted onto the line contactor
or separately fitted. It must be set to 0.58 times the rated motor
current.
SIRIUS 3RA28 function module for star-delta (wye-delta)
starting
The 3RA2816-0EW20 star-delta (wye-delta) function module
(see page 3/105)
replaces the complete wiring in the control
circuit and can be used in the voltage range from 24 to
240 V AC/DC. It is snapped onto the front of the contactor as-
sembly for star-delta (wye-delta) starting size S00, S0, S2 or S3.
One function module comprises a complete module kit:
•
Basic module with integrated control logic and time setting
•
Two coupling modules with corresponding connecting cables
The scope of supply thus comprises a complete module kit for
one contactor assembly for star-delta (wye-delta) starting in size
S00, S0, S2 or S3, regardless of the connection method.
Data of the control circuit:
•
Wide voltage range 24 to 240 V AC/DC
•
Time setting range 0.5 to 60 s (3 selectable settings)
•
Dead interval of 50 ms, non-adjustable
More information
Home page,
see www.siemens.com/sirius
Industry Mall,
see www.siemens.com/product?3RA24_3RT
Conversion tool, e.g. from 3RT10 to 3RT20,
see
www.siemens.com/sirius/conversion-tool
Online configurator for 3RT2 contactors,
see
www.siemens.com/sirius/configurators
© Siemens AG 2016