3RW4457-6BC44 Siemens SIRIUS Soft Starter 880A 500kW

SIRIUS 3RW4457-6BC44 Soft Starter – 880A / 1524A Inside-Delta

Key Technical Specifications

• Brand & Model: Siemens SIRIUS 3RW4457-6BC44 – high-feature soft starter for three-phase motors.
• Rated Operating Current: 880 A at 40 °C (standard); 1524 A at 40 °C (inside-delta).
• Motor Power Output: 500 kW at 400 V (standard); 900 kW at 400 V (inside-delta).
• Operating Voltage Range: 200–460 V AC, with -15% / +10% tolerance for both standard and inside-delta circuits.
• Control Supply Voltage: 230 V AC, 50/60 Hz, with -15% / +10% tolerance.
• Adjustable Motor Current: 176 A minimum for overload protection.
• Continuous Overload Capacity: 115% of rated current at 40 °C.
• Power Loss: Typically 250 W during operation at rated current.
• Insulation Voltage: 690 V rated, pollution degree 3 per IEC 60947-4-2.

Environmental & Mechanical Ratings

• Ambient Temperature: Operates up to 60 °C; current derates to 780 A at 50 °C and 693 A at 60 °C.
• Protection Class: IP00 – suitable for cabinet installation.
• Dimensions (W x H x D): 510 mm x 640 mm x 290 mm.
• Mounting: Screw fixing, vertical mounting ±90° rotatable, tiltable ±22.5° forward/backward.
• Clearance Distances: 100 mm upward, 5 mm sideward, 75 mm downward.
• Max Cable Length: 500 m for main circuit connections.
• Installation Altitude: Up to 5000 m above sea level.

Electrical Connections & Terminals

• Main Circuit Connection: Busbar termination for DIN cable lugs (50–240 mm² fine-stranded, 70–240 mm² stranded).
• Auxiliary Circuit: Screw terminals, solid 2x (0.5–2.5 mm²), fine-stranded with ferrule 2x (0.5–1.5 mm²).
• AWG Ratings: Main contacts 2/0–500 kcmil; auxiliary contacts 2x (20–14).
• Auxiliary Contacts: 3 NO + 1 changeover; 0 NC.
• Integrated Functions: Motor overload protection, thermal resistor evaluation, external reset, adjustable current limitation, and inside-delta circuit support.

Protection & Diagnostic Features

• Built-in Device Protection: Yes – includes thyristor monitoring and intrinsic safeguards.
• Motor Overload Protection: Adjustable to match motor FLA, with thermal memory.
• Fault Display: Visual indicator for quick diagnostics.
• Bridging Contactor: Integrated to reduce heat dissipation after start.
• Inside-Delta Ready: Optimized for high-power applications, reducing line current stress.
• Motor Brake Output: Included for dynamic braking control.

Frequently Asked Questions (FAQ)

• Is this unit brand new and original? Yes – we supply 100% new, original Siemens SIRIUS 3RW4457-6BC44 soft starters from factory stock.
• Do you have this model in stock? Yes, we maintain regular inventory of the 3RW4457-6BC44 for immediate dispatch while supplies last.
• What is the typical lead time? We ship within 5 working days after order confirmation via DHL, FedEx, or UPS.
• Can I return the product if it doesn't fit my application? Yes – we accept returns within 30 days from delivery, provided the unit is unused and in original packaging.
• What is the minimum load requirement? The soft starter requires at least 8% of the rated motor current for proper operation.
• Does it support inside-delta connection for 900 kW motors? Absolutely – the 3RW4457-6BC44 delivers 1524 A at 40 °C in inside-delta mode, matching 900 kW at 400 V.
• Is there a recommended replacement for this phased-out model? Yes – Siemens recommends the 3RW5556-6HA14 as the preferred successor from the new SIRIUS 3RW5 series.

Contact Information Inquiries: sales@nex-auto.com , +86 153 9242 9628

Partner NexAuto Technology Limited: https://www.nex-auto.com/