# Siemens SIRIUS 3RU2 Thermal Overload Relay 0.9-1.25 A

**URL:** https://aio.lv/en/product--siemens-3ru21160kb0--1797160
**Data updated:** 2026-05-18 02:44 (EEST)
**Category:** Server Parts & Components
**Manufacturer:** Siemens
**Manufacturer code:** 3RU21160KB0
**EAN:** 4011209781580
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 152.49 €
**Prices and availability valid until:** 2026-07-24 23:59
**Price without VAT (21%):** 126.02 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3ru21160kb0--1797160

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 14.07.2026 | free |
| Courier delivery to door | 17.07.2026 | 53.99 EUR |

## Summary description

The Siemens SIRIUS 3RU2 thermal overload relay, model 3RU21160KB0, is designed for reliable motor protection against overloads and phase failures. With an adjustable current range of 0.9 to 1.25 A and size S00, this industrial-grade component ensures safe operation in electrical control circuits. It is suitable for direct mounting on contactors, providing efficient thermal monitoring and system safety in various automation applications.

## Long description

The Siemens SIRIUS 3RU2 thermal overload relay is a high-performance industrial component engineered to provide precise motor protection against thermal overloads and phase failures. Designed for seamless integration into electrical control circuits, this relay features an adjustable current setting range of 0.9 to 1.25 A, ensuring that your equipment remains protected within specific operational parameters. Its compact S00 size makes it an ideal choice for space-constrained control cabinets, offering reliable performance and long-term durability in demanding automation environments.
Advantages
This thermal overload relay offers exceptional reliability by providing accurate monitoring of electrical currents to prevent motor damage. The device is built with high-quality materials that withstand harsh industrial conditions, ensuring consistent operation over time. Its design allows for direct mounting onto contactors, which simplifies the installation process and reduces the need for additional wiring or complex mounting hardware. Furthermore, the adjustable current range provides flexibility, allowing users to fine-tune the protection level to match the specific requirements of their connected motors.
Suitable for
Industrial motor control systems
Automation and process control applications
Protection of small electric motors
Integration into electrical switchgear and control panels
When it may not be suitable
This relay is not suitable for applications requiring current ranges outside of the 0.9 to 1.25 A threshold. It is also not designed for use in environments with extreme moisture or corrosive gases unless housed in an appropriate protective enclosure.
Key specifications
Current setting range: 0.9 to 1.25 A
Size: S00
Protection type: Thermal overload and phase failure
Mounting type: Direct mounting on contactors
How to use
To install the relay, align it with the corresponding contactor and secure it directly onto the device. Once mounted, connect the motor cables to the output terminals of the relay. Use the adjustment dial on the front of the unit to set the current value according to the motor's rated operational current. After installation, perform a test to ensure the relay functions correctly within the circuit.
What to consider before purchase
Verify that the motor's rated current falls within the 0.9 to 1.25 A range.
Ensure compatibility with the specific contactor size S00.
Check the environmental conditions of the installation site.
Usage recommendations
Always ensure that the power supply is disconnected before installing or adjusting the relay to prevent electrical hazards. Regularly inspect the device for signs of wear or damage to maintain optimal system safety.

## FAQ

### How much does the Siemens SIRIUS 3RU2 Thermal Overload Relay 3RU21160KB0 cost, and is it available for purchase?

The price is 152.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 4 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 14.07.2026 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 3RU2 Thermal Overload Relay 3RU21160KB0 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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