# Siemens Sirius 3RF2440-1AC45 Three-Phase Solid State Relay, 40 A, 48-600 V/AC

**URL:** https://aio.lv/en/product--siemens-3rf2440-1ac45--1793113
**Data updated:** 2026-05-18 02:46 (EEST)
**Category:** Control Systems
**Manufacturer:** Siemens
**Manufacturer code:** 3RF2440-1AC45
**EAN:** 4011209647206
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 221.49 €
**Prices and availability valid until:** 2026-07-31 23:59
**Price without VAT (21%):** 183.05 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3rf2440-1ac45--1793113

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 20.07.2026 | free |
| Pickup points | 23.07.2026 | 1.89 EUR |
| Courier delivery to door | 23.07.2026 | 4.99 EUR |

## Summary description

The Siemens Sirius 3RF2440-1AC45 is a high-performance three-phase solid state relay designed for reliable industrial switching applications. It features a rated operational current of 40 A and a switching voltage range of 48 to 600 V/AC. This robust semiconductor contactor ensures precise control and long service life in demanding electrical environments, making it an ideal solution for heating systems and motor control.

## Long description

The Siemens Sirius 3RF2440-1AC45 is a high-performance three-phase solid state relay engineered for demanding industrial switching tasks. This semiconductor contactor provides reliable operation with a rated current of 40 A and supports a wide switching voltage range from 48 to 600 V/AC. Designed for longevity and precision, it serves as a critical component in modern electrical control systems, ensuring consistent performance even under frequent switching cycles.
Advantages
This solid state relay offers significant benefits over traditional mechanical contactors, primarily due to its wear-free semiconductor switching technology. It operates silently and is immune to mechanical vibrations, which extends the service life of the device significantly. The compact design allows for efficient space utilization in control cabinets, while the high switching frequency capability ensures that it can handle complex automation processes with ease and reliability.
Suitable for
Industrial heating systems
Motor control applications
Process automation
Frequent switching operations
This device may not be suitable for applications requiring galvanic isolation that exceeds the specifications of semiconductor technology or in environments where extreme ambient temperatures exceed the manufacturer's thermal ratings without adequate cooling measures. It is also not intended for use in circuits where high-voltage surges exceed the specified operational range.
Key specifications
Rated operational current: 40 A
Operational voltage range: 48 to 600 V/AC
Phase configuration: Three-phase
Switching technology: Semiconductor
Installation should be performed by qualified personnel in accordance with local electrical regulations. The relay is typically mounted on a standard DIN rail or a flat surface within an electrical enclosure. Ensure that the control voltage is correctly connected to the input terminals and that the load is wired to the output side, maintaining proper torque settings for all terminal connections to prevent overheating.
What to consider before purchase
Verify the load current requirements do not exceed 40 A
Ensure the control voltage matches your system requirements
Check available space in the control cabinet for heat dissipation
Confirm the application environment is within the specified temperature limits
For optimal performance and longevity, ensure that the relay is installed with sufficient ventilation or an appropriate heatsink if the load current is high. Regularly inspect terminal connections for tightness and ensure the device is protected from dust and moisture.

## FAQ

### How much does the Siemens Sirius 3RF2440-1AC45 Solid State Relay cost, and is it available for purchase?

The price is 221.49 € (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 20.07.2026 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 3RF2440-1AC45 Solid State Relay 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

https://aio.lv/img/cache/product/1793113/47571246_large.webp