3RW4446-6BC44 SIRIUS Soft Starter 200-355kW Siemens

SIRIUS 3RW4446-6BC44 Soft Starter – High-Capacity Motor Control

Key Technical Specifications

• Brand & Model: Siemens SIRIUS 3RW4446-6BC44 – high-feature soft starter.
• Rated Operational Current (40 °C): 356 A (standard), 617 A (inside-delta).
• Motor Power (400 V, 40 °C): 200 kW (standard), 355 kW (inside-delta).
• Operating Voltage: 200 – 460 V AC, tolerance –15 % / +10 %.
• Control Supply: 230 V AC, 50/60 Hz, tolerance –15 % / +10 %.
• Adjustable Current Limitation: 71 – 356 A for precise motor overload protection.
• Integrated Protection: motor overload, thermistor evaluation, intrinsic device protection.
• Ambient Temperature: up to 60 °C with derating; storage –25 … +80 °C.
• Mechanical Dimensions: 210 mm (W) x 230 mm (H) x 298 mm (D).

Installation & Mounting Guidelines

• Mount the unit vertically using screw fixing; tilt ±22.5° forward/backward, rotate ±90°.
• Maintain clearances: 100 mm above, 75 mm below, and 5 mm sideways for proper airflow.
• Maximum cable length: 500 m; suitable for altitudes up to 5,000 m above sea level.
• Main circuit terminals accept 70 – 240 mm² fine-stranded or 95 – 300 mm² stranded wires.
• Auxiliary terminals support 0.5 – 2.5 mm² solid or fine-stranded with ferrule.

Electrical Connections & Auxiliary Contacts

• Main circuit: busbar connection; auxiliary/control: screw‑type terminals.
• Provides 3 NO contacts and 1 changeover contact (no NC contacts).
• Supports front, rear, or both clamping points for flexible wiring options.
• AWG conductors: main 2/0 – 500 kcmil; auxiliary 20 – 14 AWG.
• Integrated thyristors and bypass contactor reduce power loss (typ. 174 W).

Environmental & Operational Conditions

• Rated frequency: 50 … 60 Hz with ±10 % tolerance.
• Protection class IP00 (IP20 with terminal cover); designed for control cabinet installation.
• Continuous overload capacity: 115 % of Ie at 40 °C.
• Minimum load: 8 % of motor rated current.
• Thermal motor protection via PTC resistor evaluation.

What’s in the Box

• 3RW4446-6BC44 soft starter unit with integrated bypass.
• Printed quick‑start guide (multilingual).
• Mounting screws and terminal identification labels.
• No additional accessories required for basic operation.

Shipping & Logistics

• We stock genuine 3RW4446-6BC44 units for immediate dispatch.
• Delivery within 5 working days via FedEx, UPS, or DHL.
• All shipments include tracking and insurance coverage.
• 30‑day return policy for unused items in original packaging.

Frequently Asked Questions

• Is the 3RW4446‑6BC44 brand new and original? – Yes, we supply only 100 % new, genuine Siemens SIRIUS products.
• What is the maximum motor power for inside‑delta? – At 400 V, 40 °C, it handles 355 kW (617 A).
• Can I use this soft starter at 60 Hz? – Yes, it operates at 50 or 60 Hz with ±10 % tolerance.
• How do I connect the thermal protection? – Use the PTC resistor inputs; the device evaluates motor temperature directly.
• What is the minimum setting for current limitation? – Adjustable from 71 A up to rated current.
• Does it support external reset? – Yes, the 3RW4446‑6BC44 offers external reset functionality.
• What protection class does it have? – IP00 (IP20 with cover) – suitable for control cabinet installation.
• Do you offer technical support for installation? – Yes, our team provides application guidance for the SIRIUS series.

For any inquiries or to place an order, please contact us at sales@nex-auto.com or reach us via WhatsApp at +86 153 9242 9628.

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