Description
Need to prevent damaging mechanical shocks and voltage spikes during the startup of your three-phase induction motors? The Siemens 3RW3028-1BB14 soft starter is engineered precisely for this task. As a core component of the Siemens Sirius modular system (Size S0), this compact, two-phase controlled solid-state starter reduces motor torque by smoothly ramping down the initial voltage supply, protecting your mechanical drivetrain and reducing line-voltage dips.
Global Logistics & Procurement Overview
Procuring industrial automation components efficiently requires a clear understanding of international distribution networks, compliance standards, and lead times.
Availability and Lead Time
- Condition: New Original, factory sealed in genuine Siemens packaging.
- Warranty: 12-month comprehensive warranty covering functional hardware failures.
- Lead Time: Ships out of global warehousing within 1 to 2 business days upon confirmation.
- Pricing Note: The market value for industrial switchgear fluctuates based on manufacturer production runs and raw material availability. The listed price serves as a baseline reference; contact our sales team to secure a firm, contract-ready quotation.
International Shipping & Trade Compliance
Managing the cross-border movement of motor control hardware demands strict adherence to export control codes and customs frameworks to prevent costly delays at the border.
- Incoterms: Standard delivery terms are EXW (Ex Works) or DAP (Delivered at Place) for worldwide shipments, providing transparent cost demarcation between buyer and seller.
- Customs Clearance & HS Code: This device is classified internationally under HS Code 85371091 (Programmable controllers/Solid-state motor starters for voltage \le 1,000 V). Ensure your import documentation explicitly states this classification to expedite border processing.
- Logistics Options: For critical production downtime or assembly line stoppages, express air courier (DHL Express, FedEx Priority, or UPS Worldwide) delivers to most industrial zones within 48 to 72 hours. For routine control panel builds, consolidated air or sea freight optimizes transport budgets.
Technical Specifications
Reviewing precise structural and electrical parameters ensures the device integrates flawlessly into your existing control cabinet layout.
| Parameter | Specification |
| Manufacturer | Siemens |
| Product Line | Sirius 3RW30 |
| Order Code | 3RW3028-1BB14 |
| Frame Size | Size S0 (45 mm width) |
| Operational Voltage | 200 to 480 V AC (50 / 60 Hz) |
| Rated Operational Current | 38 A (at 40 °C ambient temperature) |
| Motor Power Rating (400 V) | 18.5 kW (Standard three-phase induction motor) |
| Control Supply Voltage | 110 to 230 V AC / DC |
| Control Mechanism | Two-phase phase-angle control with integrated bypass contacts |
| Ramp Time | Adjustable via potentiometer (0 to 20 seconds) |
| Starting Voltage | Adjustable via potentiometer (40% to 100% of line voltage) |
| Mounting Type | Screw or 35 mm DIN rail mounting |
Field Application & Hardware Integration
In field deployments of Sirius motor starters, neglecting the internal thermal dynamics is a frequent cause of premature tripping. Well, technically the 3RW3028-1BB14 features internal bypass contacts that close after the ramp-up cycle completes—reducing steady-state heat generation—but you must still account for the heat dissipated during the high-current startup phase. Do don’t skimp on cabinet ventilation space.
During a recent conveyor system overhaul at a material handling facility, the design team selected this unit to replace a direct-on-line (DOL) starter that was tearing up drive belts. The change was immediately noticeable. By adjusting the voltage ramp potentiometer on the front face to 6 seconds and setting the starting voltage to 50%, the conveyor smoothly accelerated to full operating speed without spilling product or snapping mechanical links.
Keep an eye on the control supply terminals (A1 and A2). This specific sub-model accommodates a wide control voltage envelope between 110 V and 230 V AC/DC. However, if your control circuit drops below 90 V due to long cable runs or poor transformer sizing, the bypass relays may chatter or fail to latch, causing the unit to fault out during operation.
Siemens 3RW3028-1BB14 Procurement FAQ
Does this soft starter provide integrated electronic motor overload protection?
No, the 3RW30 family is designed for ultimate compactness and does not include built-in motor overload diagnostics. You must install a separate thermal or electronic overload relay (such as a Sirius 3RU21 or 3RB30) directly downstream to meet electrical code safety requirements.
Can I use this unit to control a single-phase AC motor?
Absolutely not. The internal switching logic relies on phase-angle control across two of the three phases to regulate a balanced magnetic field in three-phase induction motors. Attempting to wire a single-phase load will cause immediate thyristor failure.
What causes the “Device Fault” LED to flash immediately after a start command?
In my experience, this usually points to either a phase missing on the line side (L1/L2/L3) or a severe current asymmetry caused by a damaged motor winding downstream. Always isolate the power and verify the incoming line-to-line voltages before condemning the soft starter hardware itself.
