Product Overview
When reliable, controlled motor starting is critical, the Siemens 3RW4457-6BC44 SIRIUS soft starter delivers robust performance for demanding industrial applications. This phased-out unit is a proven workhorse, now superseded by the Siemens 3RW5556-6HA14. The Siemens 3RW4457-6BC44 features integrated bypass and thyristor control, providing smooth acceleration and protection for high‑inertia loads.
Technical Specifications
-
Operational current at 40 °C (standard circuit): 880 A
-
Operational current at 40 °C (inside‑delta circuit): 1524 A
-
Rated power at 400 V (standard circuit, 40 °C): 500 kW
-
Rated power at 400 V (inside‑delta circuit, 40 °C): 900 kW
-
Operating voltage (standard/inside‑delta): 200–460 V AC
-
Control supply voltage: 230 V AC (50/60 Hz)
-
Motor overload protection: Adjustable from 176 A
-
Power loss typical: 250 W at operational current
-
Pollution degree: 3 per IEC 60947‑4‑2
Industry Applications
The Siemens 3RW4457-6BC44 excels in heavy‑duty motor control, including pumps, compressors, conveyors, and crushers. With an inside‑delta capability rated at 1524 A, it handily manages large three‑phase motors in applications requiring frequent starts or extended ramp times. Its integrated bypass reduces heat dissipation and extends contactor life, making it ideal for continuous processes.
Installation & Mounting
This Siemens 3RW4457-6BC44 soft starter has dimensions of 510 × 640 × 290 mm (W×H×D) and uses screw fixing. It can be mounted on a vertical surface with ±90° rotation and ±22.5° tilt front/back. Required side‑by‑side spacing: 100 mm upward, 5 mm lateral, 75 mm downward. Main circuit connections accept busbars; auxiliary terminals use screw‑type connections.
Selection Guide
Before purchasing, verify that your motor’s rated current and voltage fall within the Siemens 3RW4457-6BC44 operating range (200–460 V AC, up to 880 A standard). Since this unit is phased out, PLC Source PRO also stocks the preferred successor, Siemens 3RW5556-6HA14. For assistance in selecting the right soft starter for your application, contact the experts at ubest101.