Siemens 3RW4075-6BB44 SIRIUS Soft Starter
Warranty: 1 year
Condition : brand new in factory sealed box
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Detail
- Product NameSiemens 3RW4075-6BB44 SIRIUS Soft Starter
- Item NO.3741795
- Weight8.8000 kg = 19.4007 lb = 310.4109 oz
- CategoryPLC
- BrandSiemens
- Creation Time2026-08-20
3RW4075-6BB44
Overview
3RW4075-6BB44 is a high-performance SIRIUS soft starter from Siemens' 3RW40 series. It is designed for smooth acceleration and deceleration of 3-phase asynchronous motors, reducing mechanical stress on equipment and limiting inrush current.
The device features an integrated bypass contactor that automatically bridges the thyristors after motor startup, significantly reducing heat dissipation and enabling a compact, energy-efficient design. It provides motor overload protection and intrinsic device protection without the need for additional overload relays.
This S12 frame size soft starter supports motors up to 200 kW at 400 V with a rated operational current of 356 A at 40°C. It is designed for standard industrial applications and is suitable for 50/60 Hz networks.
- Siemens SIRIUS 3RW40 Series
- 356 A rated operational current
- 200 kW at 400 V (40°C)
- Integrated bypass contactor
- Screw terminals
Specifications
Electrical & performance
| Manufacturer | Siemens |
| Model | 3RW4075-6BB44 |
| Series | SIRIUS 3RW40 |
| Frame size | S12 |
| Rated operational current (Ie) @ 40°C | 356 A |
| Rated operational current @ 50°C | 315 A |
| Rated operational current @ 60°C | 280 A |
| Motor power @ 400 V (40°C) | 200 kW |
| Motor power @ 230 V (40°C) | 110 kW |
| Operating voltage | 200-460 V AC |
| Operating frequency | 50-60 Hz |
| Control supply voltage | 230 V AC (50/60 Hz) |
| Adjustable motor current range | 131-356 A |
| Power loss (typical) | 125 W |
Physical & environmental
| Mounting | Screw fixing |
| Protection rating | IP00 |
| Minimum load | 20% of Ie |
| Max cable length | 300 m |
| Country of origin | Germany |
| Certifications | CE, UL, CSA |
Features
Motor control & protection
- Soft start/soft stop — Provides smooth acceleration and deceleration of 3-phase asynchronous motors, reducing mechanical stress on belts, gears, and couplings.
- Integrated bypass contactor — After motor startup, the thyristors are bypassed, significantly reducing heat dissipation and enabling a compact, energy-efficient design.
- Motor overload protection — Integrated Class 10/15/20 overload protection eliminates the need for separate overload relays, reducing panel space and wiring.
Diagnostics & energy saving
- Intrinsic device protection — Protects the thyristors from thermal overload, ensuring long-term reliability and reducing the need for costly repairs.
- Adjustable current limitation — Limits inrush current during startup to a settable maximum value, protecting the motor and reducing stress on the power supply network.
- Status & fault monitoring — LED indicators provide visual status and fault indication for easy diagnosis and quick fault clearance.
Applications
The 3RW4075-6BB44 is widely deployed in industrial applications requiring soft starting of large motors.
Lifecycle
Phased-out no longer in active production — limited availability
Product status: The 3RW4075-6BB44 has been phased-out by Siemens and is no longer in active production. It may still be available through surplus stock or authorized distributors as a legacy spare part for existing systems.
Spare parts & support: Replacement units and accessories are available through Siemens' standard support channels and authorized distributors, but availability may be limited. For new installations, the successor model is strongly recommended.
Replacement & migration:
- When replacing the 3RW4075-6BB44 with the 3RW5075-6AB14, verify all electrical and mechanical dimensions, including mounting hole positions and main circuit connection lugs, to ensure compatibility with your existing panel layout.
- The 3RW5 series offers enhanced functionality including PROFINET communication, advanced diagnostics, and improved energy efficiency.
Recommendation: For new installations, we strongly recommend the successor 3RW5075-6AB14. For existing systems, procuring spare units while available is advisable.
FAQ – Frequently Asked Questions
No. Siemens has phased out this product and it is no longer in active production. For new installations, the preferred successor is 3RW5075-6AB14.
It supports motors up to 200 kW at 400 V (40°C ambient temperature).
Yes, it features an integrated bypass contactor that automatically bridges the thyristors after motor startup, reducing heat dissipation and improving energy efficiency.
It uses screw terminals for both main circuit and control circuit connections.
3RW5075-6AB14 is the newer SIRIUS 3RW5 series successor, offering enhanced features including PROFINET communication, advanced diagnostics, and improved energy efficiency. The 3RW4075-6BB44 is the legacy product.
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