Siemens 3RW4456-6BC44 SIRIUS Soft Starter | 450kW 780A Industrial Motor Control

Siemens 3RW4456-6BC44 SIRIUS Soft Starter

Manufacturer: Siemens
Model: 3RW4456-6BC44
Product Type: SIRIUS Soft Starter
Status: Phased-out Product (Successor: 3RW5554-6HA14)
Warranty: 12 Months
Shipping: FedEx / UPS / DHL
Contact: sales@powergearx.com |
+86 18030005825
Author: Powergear X Automation

Quick Overview

• High-power Siemens SIRIUS soft starter for large motors.
• Rated 780A, 450kW at 400V / Inside-Delta: 1351A, 800kW.
• Voltage range: 200–460V AC, 230V AC control.
• Temperature range: -25°C to +60°C operation.
• Compact housing: 510mm × 640mm × 290mm, Weight 67kg.

Core Features

• Built-in thyristors and bypass contact system.
• Motor overload and thermistor protection.
• External reset and adjustable current limit.
• Supports Inside-Delta circuit configuration.
• Clear fault display for fast diagnostics.

Technical Specifications

• Rated current: 780A at 40°C / 615A at 60°C.
• Inside-Delta current: up to 1351A at 40°C.
• Operating frequency: 50–60Hz ±10%.
• Insulation voltage: 690V, Pollution degree: 3 (IEC 60947-4-2).
• Continuous operation: 115% of rated current.
• Power loss: 214W typical during load.
• Altitude limit: 5000m above sea level.

Electrical Connections

• Main circuit: Busbar connection, 3 poles.
• Auxiliary circuit: Screw-type terminals, 3 NO + 1 CO contacts.
• Supports wire sizes up to 240mm² main and 2.5mm² auxiliary.
• Control voltage: 230V AC at 50/60Hz ±15% tolerance.

Performance Highlights

• Delivers up to 800kW in Inside-Delta mode.
• Efficient start-up for heavy industrial motors.
• Reduced torque shock, longer equipment lifespan.
• Meets IEC and UL/CSA performance standards.
• Compatible with new Siemens SIRIUS 3RW5 series.

Why Choose Powergear X Automation

• Genuine Siemens soft starters, factory sealed.
• Fast global delivery with full tracking.
• Expert technical consultation and support.
• Partnered with Ubest Automation Limited.

FAQ – Technical Insights

• Q1: What is the key upgrade in the successor model 3RW5554-6HA14?
  A1: The successor features enhanced digital control and energy-efficient performance under Siemens 3RW5 series design.
• Q2: Can 3RW4456-6BC44 be replaced directly with the new 3RW5 model?
  A2: Yes, dimensions and wiring remain similar; only control interface changes slightly.
• Q3: How to prevent overheating during frequent motor starts?
  A3: Ensure proper ventilation and observe derating at ambient temperatures above 40°C.
• Q4: What is the typical installation clearance needed?
  A4: Maintain 100mm above, 75mm below, and 5mm side spacing for airflow.
• Q5: Does Powergear X Automation provide setup guidance?
  A5: Yes, we offer step-by-step wiring and configuration assistance via email or WhatsApp support.

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