# ONKA Elektrik MRK Universal Screw Terminal Block 4mm2 Yellow

**URL:** https://aio.lv/en/product--onka-elektrik-t0-1028-1010028--12463060
**Data updated:** 2026-05-18 09:36 (EEST)
**Category:** Power Sockets
**Manufacturer:** ONKA Elektrik
**Manufacturer code:** T0-1028-1010028
**EAN:** 5900103207557
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 3.99 €
**Prices and availability valid until:** 2026-08-15 23:59
**Price without VAT (21%):** 3.30 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--onka-elektrik-t0-1028-1010028--12463060

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 05.08.2026 | free |
| Pickup points | 10.08.2026 | 1.79 EUR |
| Courier delivery to door | 10.08.2026 | 4.99 EUR |

## Summary description

The ONKA Elektrik MRK universal screw terminal block is designed for secure electrical connections in control panels and industrial installations. Featuring a 4mm2 cross-section and a distinct yellow housing, this component ensures reliable wire termination and efficient circuit management. It is built for durability and ease of use in professional electrical engineering applications.

## Long description

The ONKA Elektrik MRK universal screw terminal block is a high-quality electrical component engineered for secure and reliable wire termination in industrial control panels and electrical distribution systems. Designed to accommodate a 4mm2 cross-section, this terminal block provides a robust connection point that ensures electrical integrity and safety. Its distinct yellow housing allows for easy identification within complex wiring layouts, facilitating efficient maintenance and circuit management in professional electrical engineering environments.
Advantages
This terminal block offers exceptional mechanical stability and electrical conductivity, ensuring that connections remain secure even under vibration or thermal expansion. The screw-clamp technology provides a high-pressure contact that minimizes resistance and prevents accidental wire loosening. Its compact design allows for high-density mounting on standard DIN rails, optimizing space within enclosures. The durable insulating material provides excellent protection against environmental factors, making it a dependable choice for long-term industrial use.
Suitable for
Industrial control panels
Electrical distribution boards
Automation and instrumentation systems
Building management systems
General electrical wiring installations
When it may not be suitable
This terminal block is not intended for use with wire sizes significantly larger or smaller than the specified 4mm2 capacity, as this may result in poor contact or mechanical failure. It is also not suitable for high-voltage power transmission lines or environments exposed to extreme corrosive chemicals that could degrade the housing material.
Key specifications
Cross-section capacity: 4mm2
Connection type: Screw terminal
Color: Yellow
Mounting type: DIN rail
Application: Industrial electrical installations
How to use
To install the terminal block, snap it securely onto a standard DIN rail. Strip the insulation from the end of your electrical wire to the appropriate length, insert the conductor into the terminal opening, and tighten the screw firmly using a compatible screwdriver. Ensure the wire is fully seated and that the screw is tightened to the recommended torque to guarantee a reliable connection. Multiple blocks can be joined together to create a terminal strip as required by your circuit design.
What to consider before purchase
Verify that the 4mm2 cross-section matches your specific wire gauge requirements.
Ensure you have the correct DIN rail type for mounting.
Check the total number of connections needed for your project to purchase sufficient quantities.
Confirm compatibility with your existing terminal block system or accessories.
Usage recommendations
Always ensure that the power supply is completely disconnected before performing any wiring or maintenance work on the terminal blocks to prevent electrical shock.

## FAQ

### How much does the ONKA Elektrik MRK 4mm2 Universal Screw Terminal Block cost, and is it available for purchase?

The price is 3.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 64 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 05.08.2026 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 ONKA Elektrik 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 ONKA Elektrik 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/12463060/68764832_large.webp