The individual parts for the contactor assemblies for star-delta (wye-delta) starting for customer assembly must be ordered separately.

• For 3RT contactors, see "Power contactors for switching motors" > "SIRIUS 3RT contactors, 3-pole up to 250 kW":
  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 contactors can occur on reversing, providing 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 interval 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.
• For the mechanical interlock, see "Accessories and Spare Parts" > "for SIRIUS 3RT1 Contactors and SIRIUS 3RH1 Contactor Relays" > “Miscellaneous")
• For wiring kits, see "Accessories and Spare Parts" > "for SIRIUS 3RT1 Contactors and SIRIUS 3RH1 Contactor Relays" > “Miscellaneous": consisting of wiring modules or link rails and neutral bridges
• For the adapter for the mechanical interlock between S6 and S3, see "Accessories and Spare Parts" > "for SIRIUS 3RT1 Contactors and SIRIUS 3RH1 Contactor Relays" > “Miscellaneous")
• For the base plate, see "Accessories and Spare Parts" > "for SIRIUS 3RT1 Contactors and SIRIUS 3RH1 Contactor Relays" > “Miscellaneous":

Further components

• For momentary-contact operation: auxiliary switch (NO contact) for self-locking
• 3RB2 overload relays (see "Protection Devices"), SIMOCODE pro 3UF7 motor management and control devices (see "Monitoring and Control Devices") or 3RN thermistor motor protection evaluation devices (see "Monitoring and Control Devices" > "Relays") can be used as 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 contactors 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 starting¹⁾ 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.

Contactor assemblies for star-delta (wye-delta) starting · Sizes S6-S6-S3 · up to 160 kW

Contactor assemblies for star-delta (wye-delta) starting · Sizes S6-S6-S6 · up to 160 kW

Contactor assemblies for star-delta (wye-delta) starting · Sizes S10-S10-S6 · up to 250 kW

Contactor assemblies for star-delta (wye-delta) starting · Sizes S10-S10-S10 · up to 250 kW

Contactor assemblies for star-delta (wye-delta) starting · Sizes S12-S12-S10 · up to 500 kW

Contactor assemblies for star-delta (wye-delta) starting · Sizes S12-S12-S12 · up to 500 kW