# Siemens 3RU2126-4BB0 Thermal Overload Relay 14-20A

**URL:** https://aio.lv/en/product--siemens-3ru2126-4bb0--1796254
**Data updated:** 2026-05-18 02:39 (EEST)
**Category:** Miscellaneous repair tools
**Manufacturer:** Siemens
**Manufacturer code:** 3RU2126-4BB0
**EAN:** 4011209780941
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 42.49 €
**Prices and availability valid until:** 2026-07-17 23:59
**Price without VAT (21%):** 35.12 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3ru2126-4bb0--1796254

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 08.07.2026 | free |
| Pickup points | 13.07.2026 | 1.99 EUR |
| Courier delivery to door | 13.07.2026 | 4.99 EUR |

## Summary description

The Siemens 3RU2126-4BB0 is a reliable thermal overload relay designed for motor protection in industrial applications. It features an adjustable current setting range of 14 to 20A, providing precise protection against overloads and phase failures. This component is essential for ensuring the longevity and safe operation of electrical motors in various automation systems.

## Long description

The Siemens 3RU2126-4BB0 thermal overload relay is a high-quality industrial component engineered to provide robust protection for electrical motors. Designed for reliability and precision, this relay monitors current flow to prevent damage caused by overloads or phase failures, thereby extending the operational lifespan of your motor equipment in demanding automation environments.
Advantages
This thermal overload relay offers exceptional accuracy in current monitoring, allowing for precise adjustments within the 14 to 20A range to match specific motor requirements. Its compact design facilitates easy integration into existing control cabinets, while the high-quality construction ensures consistent performance under various industrial conditions. By providing reliable protection against thermal stress and phase loss, it minimizes the risk of unexpected downtime and costly motor repairs.
Suitable for
Industrial motor protection systems
Automation and control panels
Manufacturing machinery
HVAC systems and pump control
When it may not be suitable
This device is not intended for use in circuits where the motor current falls outside the 14 to 20A range. It is also not suitable for applications requiring electronic overload protection with advanced communication features or specialized hazardous area environments without appropriate protective enclosures.
Key specifications
Current setting range: 14 to 20A
Protection type: Thermal overload and phase failure
Mounting type: Direct mounting or stand-alone installation
Application: Motor protection
How to use
The relay should be installed by a qualified professional in accordance with local electrical regulations. It is typically mounted directly onto a compatible contactor or installed on a standard DIN rail. Once installed, the current setting dial should be adjusted to the specific full-load current rating of the motor being protected. Regular testing of the trip mechanism is recommended to ensure the device remains functional.
What to consider before purchase
Verify that the motor full-load current falls within the 14 to 20A range.
Ensure compatibility with your existing contactor or mounting system.
Check the environmental conditions of the installation site to ensure they meet the device's operating specifications.
Usage recommendations
Always ensure the power supply is disconnected before installing or adjusting the relay. Periodically inspect the terminals for tightness and ensure the device is free from dust or debris to maintain optimal thermal performance.

## FAQ

### How much does the Siemens 3RU2126-4BB0 Thermal Overload Relay cost, and is it available for purchase?

The price is 42.49 € (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 08.07.2026 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. All transactions are 100% secure and encrypted.

### 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/1796254/47583418_large.webp