# Siemens SIRIUS 3RW4027-1BB04 Soft Starter, 3-Phase, 15kW at 400V, 32A, 24V AC/DC

**URL:** https://aio.lv/en/product--siemens-3rw4027-1bb04--3271820
**Data updated:** 2026-05-18 02:54 (EEST)
**Category:** Control Systems
**Manufacturer:** Siemens
**Manufacturer code:** 3RW4027-1BB04
**EAN:** 4011209691704
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 568.99 €
**Prices and availability valid until:** 2026-07-29 23:59
**Price without VAT (21%):** 470.24 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3rw4027-1bb04--3271820

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 16.07.2026 | free |
| Pickup points | 21.07.2026 | 1.89 EUR |
| Courier delivery to door | 21.07.2026 | 4.99 EUR |

## Summary description

The Siemens SIRIUS 3RW4027-1BB04 is a compact 3-phase soft starter designed for smooth motor starting and stopping. It supports a power rating of 15kW at 400V with a rated current of 32A and operates on a 24V AC/DC control voltage. Ideal for industrial applications, this device reduces mechanical stress on motors and minimizes current peaks during startup, ensuring reliable and efficient operation in various electrical systems.

## Long description

The Siemens SIRIUS 3RW4027-1BB04 is a high-performance 3-phase soft starter engineered to provide smooth acceleration and deceleration for electric motors. By controlling the voltage supplied to the motor, this device effectively manages startup current and torque, preventing mechanical shocks and electrical surges that can damage equipment over time. Its compact design and robust construction make it a reliable solution for demanding industrial environments where motor longevity and system stability are critical.
Advantages
This soft starter offers significant benefits by reducing the mechanical stress on drive components such as belts, gears, and couplings, which leads to lower maintenance costs and extended service life for the entire drive train. The integrated electronic overload protection ensures that the motor is safeguarded against thermal damage, while the soft-start functionality minimizes voltage dips in the power supply network during the startup phase. Its compact size allows for space-saving installation in control cabinets, and the 24V AC/DC control voltage provides flexibility for integration into various automation systems.
Suitable for
Conveyor belt systems
Pumps and hydraulic systems
Compressors
Fans and ventilation units
Centrifuges and mixers
When it may not be suitable
This device is not intended for applications requiring frequent start-stop cycles at very high duty rates, as it may overheat without adequate cooling. It is also not suitable for applications that require precise speed control or variable frequency operation, as it is strictly a soft starter and not a variable frequency drive.
Key specifications
Rated power: 15kW at 400V
Rated current: 32A
Control voltage: 24V AC/DC
Phase: 3-phase
Integrated overload protection: Yes
Size: S0
How to use
The soft starter should be installed in a vertical position within a ventilated control cabinet to ensure proper heat dissipation. Connect the main power supply to the input terminals and the motor leads to the output terminals. The control circuit must be wired to the 24V AC/DC terminals according to the provided wiring diagram. Once installed, the device parameters should be adjusted using the integrated potentiometers to match the specific requirements of the motor and the load characteristics.
What to consider before purchase
Ensure the motor power rating matches the 15kW capacity at 400V.
Verify that the control voltage of 24V AC/DC is compatible with your existing PLC or control system.
Check the available space in your control cabinet for the S0 frame size.
Confirm that the application does not require variable speed control.
Usage recommendations
Always ensure that the motor is correctly sized for the soft starter and that all electrical connections are tightened to the specified torque values to prevent overheating and connection failures.

## FAQ

### How much does the Siemens SIRIUS 3RW4027-1BB04 Soft Starter cost, and is it available for purchase?

The price is 568.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 2 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 16.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Installment. All transactions are 100% secure and encrypted.

### Can Siemens SIRIUS 3RW4027-1BB04 Soft Starter be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Siemens products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Siemens service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

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