# DIN-rail Universal Electronic Relay Eltako EUD12NPN-UC (MPN 21100806, EAN 4010312107843)

**URL:** https://aio.lv/en/product--eltako-21100806--12374853
**Data updated:** 2026-04-26 20:46 (EEST)
**Category:** Control Systems
**Manufacturer:** Eltako
**Manufacturer code:** 21100806
**EAN:** 4010312107843
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 49.49 €
**Prices and availability valid until:** 2026-08-24 23:59
**Price without VAT (21%):** 40.90 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--eltako-21100806--12374853

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 10.08.2026 | free |
| Pickup points | 13.08.2026 | 1.79 EUR |
| Courier delivery to door | 13.08.2026 | 4.99 EUR |

## Summary description

Eltako EUD12NPN-UC is a DIN-rail mountable universal electronic relay designed for building automation and control applications. Manufactured by Eltako (MPN 21100806, EAN 4010312107843), it provides reliable switching and interface functions for control circuits. Suitable for integrating sensors, switches and PLC outputs into lighting, heating or automation systems where compact DIN-rail components are required.

## Long description

Eltako EUD12NPN-UC is a DIN-rail mountable universal electronic relay designed for integration into building automation and control panels. It provides a compact interface for switching and signal conversion between sensors, NPN transistor outputs and downstream loads. The device is intended for applications where space is limited and reliable electronic switching with short reaction times is required.
Advantages
The relay offers a slim DIN-rail form factor that saves panel space and simplifies installation. Its universal input compatibility allows connection of common NPN outputs and switching sensors, reducing the need for separate interface modules. Electronic switching eliminates mechanical wear, provides fast response and supports silent operation in control circuits.
Suitable for
Interfacing NPN transistor outputs and sensors with lighting control systems
Signal conversion for PLC inputs or low-voltage control circuits
DIN-rail distribution boards in residential and commercial automation
Applications requiring compact, low-maintenance switching modules
When it may not be suitable
The device is not intended as a direct replacement for high-power contactors or for switching significant mains currents without appropriate downstream relays or contactors. It may also be unsuitable where galvanic isolation between circuits is strictly required unless additional isolation measures are provided.
Key specifications
Mounting: DIN-rail housing for standard distribution rails
Function: Universal electronic relay / signal interface for NPN inputs
Output type: Electronic switching suitable for control circuits
Size: Slim module designed for space-efficient panel installation
Typical use: Building automation, lighting and HVAC control integration
How to use
Install the relay on a standard DIN-rail in the control cabinet and connect the input wiring from sensors or NPN transistor outputs following the wiring guidelines in the manufacturer's documentation. Connect the output side to the downstream control circuit or to a relay/contactor appropriate for the load. Verify supply voltage and correct polarity before energising. After wiring, test the switching function with the control source and confirm correct integration with the automation system.
What to consider before purchase
Confirm compatibility of input signal type and voltage levels with connected sensors or controllers
Check whether additional isolation or higher-power switching devices are required for the intended loads
Ensure available DIN-rail space and installation environment meet device dimensions and thermal requirements
Usage recommendations
Integrate the relay into a labelled control panel and document wiring connections to simplify maintenance. Use the module for low-voltage control tasks and pair with appropriate contactors for switching heavy loads. Follow the manufacturer's installation instructions and local electrical codes when wiring and commissioning.

## FAQ

### How much does the Eltako EUD12NPN-UC DIN-rail electronic relay cost, and is it available for purchase?

The price is 49.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 500 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 10.08.2026 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 Eltako 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 Eltako 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/12374853/68513221_large.webp