SIEMENS
3/183
Siemens IC 10 · 2017
Contactor Assemblies for Star-Delta (Wye-Delta) Starting
Contactor assemblies for star-delta (wye-delta) starting consisting of SIRIUS 3RT contactors, up to 500 kW
3
■
Overview
The individual parts for the contactor assemblies for star-delta
(wye-delta) starting for customer assembly must be ordered
separately.
•
3RT contactors: The operating times of the individual
3RT10 contactors are rated in such a way that no overlapping
of the contact making and the arcing time between two con-
tactors can occur on reversing, provided they are interlocked
by way of their auxiliary switches (NC contact interlock) and
the mechanical interlock.
For assemblies with AC operation and 50/60 Hz, a dead inter-
val of 50 ms must be provided when used with voltages over
500 V; a dead interval of 30 ms is recommended for use with
voltages up to and including 400 V. These dead times do not
apply to assemblies with DC operation.
The operating times of the individual contactors are not
affected by the mechanical interlock.
•
Mechanical interlock
•
Wiring kits: consisting of wiring modules or link rails and star
jumpers
•
Adapter for the mechanical interlock between S6 and S3
•
Base plate
Additional components
•
For momentary-contact operation: auxiliary switch
(NO contact) for self-locking
•
3RB2 overload relays
(see from page 7/109 onwards)
,
SIMOCODE pro 3UF7 motor management and control
devices
(from page 10/14 onwards)
or 3RN thermistor motor
protection evaluation units
(page 10/164)
can be used for
overload 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.
•
Optional surge suppression for the S3 contactors; the contac-
tors in sizes S6 to S12 are wired as standard with varistors.
The contactor assemblies for star-delta (wye-delta) starting for
customer assembly 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.
More information
Home page,
see www.siemens.com/sirius
Industry Mall,
see www.siemens.com/product?3RA24_3RT
© Siemens AG 2016