Siemens SIRIUS 3RW4074-6BB44 Soft Starter — 280A Heavy Duty

Product Overview — Siemens SIRIUS 3RW4074-6BB44

The Siemens SIRIUS 3RW4074-6BB44 soft starter controls heavy motors smoothly. It lowers mechanical shock, protects equipment, and improves system reliability. Author: Powergear X Automation.

Key Technical Specifications

• Brand: Siemens / Series: SIRIUS / Model: 3RW4074-6BB44
• Motor power: 160 kW @ 400 V / Current rating: 280 A @ 40°C
• Operating voltage: 200–460 V AC / Frequency: 50–60 Hz
• Control supply: 230 V AC
• Current limitation and motor overload protection included
• Power loss: approx. 90 W at rated current
• Protection class: IP00

Installation & Wiring

• Easy mounting with screw terminals and busbar connectors
• Supports conductor size up to 240 mm²
• Clearance required: top 100 mm / bottom 75 mm / side 5 mm
• Max installation altitude: 5000 m

Included Items

• 3RW4074-6BB44 soft starter
• Mounting screws and wiring quick guide
• Ships via FedEx / UPS / DHL

FAQ

• Q: How do I select the correct soft starter size?
• A: Match motor power and current, then check ambient temperature.
• Q: Can it start high-inertia loads?
• A: Yes, use current limitation settings during commissioning.
• Q: Does it work with external motor protection relays?
• A: Yes, it connects easily through auxiliary terminals.

Contact & Sales

• Email: sales@powergearx.com
• WhatsApp: +86 18030005825
• Original Source: https://www.powergearx.com/
• Partner: Ubest Automation Limited
• Copyright © 2025 Powergear X Automation Limited. All rights reserved.