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Leverage preassembled 3RA24 units
Order factory‑wired, tested star‑delta combinations in sizes S00 to S3 for outputs up to 90 kW, ready to mount and commission.
Why Star-delta contactor assemblies?
SIRIUS star delta contactor assemblies deliver a reliable, space saving solution for starting asynchronous motors with maximum efficiency.By reducing starting current to one third of direct on line values, they protect your system and extend motor life. Siemens designs overcome common switchover challenges such as current peaks and contact wear through optimized circuitry and integrated components, ensuring smooth operation and long-term performance.
Key benefits
Reduce starting current
Limit motor inrush to a fraction of direct‑on‑line starting, helping protect upstream protection devices and minimize electrical stress on the system.
Accelerate panel build
Deploy prewired assemblies that arrive tested with integrated interlocks, cutting wiring effort and shortening commissioning time.
Enhance machine uptime
Use robust SIRIUS components and preferred star‑delta circuitry to avoid nuisance trips and contact wear during switchover.
Featured capabilities
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Choose screw or spring terminals
Select the connection technology that fits your build standards—both options available across the preassembled portfolio.
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Add 3RA28 timing module
Snap on a function module with wide 24–240 V AC/DC supply, 0.5–60 s timing and an integrated 50 ms dead interval to simplify control wiring.