Siemens 3RW4055-6BB44 SIRIUS Soft Starter — Industrial Motor Control

Overview — Siemens SIRIUS Soft Starter Highlight

The 3RW4055-6BB44 soft starter reduces inrush current and protects three-phase motors during start operations.

• This unit belongs to the reliable SIRIUS series by Siemens, ideal for standard industrial motor control.
• It simplifies installation, minimizes mechanical stress, and extends motor lifespan.

Key Selling Points

• High Output: Delivers 75 kW at 400 V for powerful, efficient starts.
• Strong Current Rating: Supports 134 A at 40 °C with consistent thermal performance.
• Wide Voltage Range: Operates between 200–460 V AC for versatile applications.

Technical Specifications (Brand & Model Included)

• Brand: Siemens
• Model: 3RW4055-6BB44
• Series: SIRIUS S6
• Operating Current: 134 A at 40 °C, 117 A at 50 °C, 100 A at 60 °C
• Rated Power Output: 75,000 W (75 kW) at 400 V, 37,000 W at 230 V
• Motor Horsepower: 30 hp at 200/208 V, 75 hp at 460/480 V
• Control Supply Voltage: 230 V AC (50/60 Hz ±10%)
• Technology: Thyristor-based with integrated bypass for low-loss operation
• Motor Overload Protection: Adjustable (min 59 A)
• Ambient Temperature Range: -25 °C to +60 °C
• Storage Temperature: -40 °C to +80 °C
• Protection Class: IP00
• Dimensions: 250 mm (D) × 120 mm (W) × 198 mm (H)
• Altitude: Up to 5000 m
• Auxiliary Contacts: 2 NO + 1 CO
• Connection Terminals: 16–120 mm² (DIN lug or box terminal)
• Display: Red fault indicator

Installation Guide

• Mount vertically with a 5 mm side spacing for air circulation.
• Allow 100 mm clearance above and 75 mm below for ventilation.
• Use copper conductors within specified ranges to avoid heat buildup.
• Keep installation altitude under 5000 m to maintain rated current.
• Derate current above 40 °C according to manufacturer’s table.

Packaging List

• 1 × Siemens 3RW4055-6BB44 SIRIUS Soft Starter
• 1 × Installation Manual (English)
• 1 × Wiring Diagram & Mounting Screws
• Terminal Covers for safe installation
• Shipping options: FedEx, UPS, DHL (worldwide express)

Environmental & Performance Notes

• Integrated motor protection and overload limitation ensure durability.
• Handles voltage fluctuation ±15% and frequency variation ±10%.
• Active power loss: 60 W typical at rated operation.
• Bypass contacts reduce heat and energy loss during continuous running.

FAQ

• Q: What motor sizes can this starter handle?
  A: Suitable for motors up to 75 kW at 400 V (134 A rated).
• Q: Can I install this in compact control panels?
  A: Yes, ensure required clearances and ambient temperature within range.
• Q: Does it include a motor brake output?
  A: No, please use an external braking module if required.
• Q: How should I connect the control supply?
  A: Connect 230 V AC to the marked terminals; verify polarity before power-up.
• Q: Which shipping methods are available?
  A: Powergear X Automation offers global shipping via FedEx, UPS, and DHL.

Why Choose This Model

• The 3RW4055-6BB44 provides high performance in a compact S6 form factor.
• Siemens SIRIUS quality ensures long-term reliability and easy setup.
• Integrated bypass and protection reduce maintenance cost and downtime.

Contact Information

• Email: sales@powergearx.com
• WhatsApp: +86 18030005825

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