# ONKA Elektrik MRK Universal Screw Terminal Block 4mm2 Blue

**URL:** https://aio.lv/en/product--onka-elektrik-t0-1025-1010025--12471455
**Data updated:** 2026-05-18 09:36 (EEST)
**Category:** Power Sockets
**Manufacturer:** ONKA Elektrik
**Manufacturer code:** T0-1025-1010025
**EAN:** 5900103207472
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 3.99 €
**Prices and availability valid until:** 2026-08-18 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-t0-1025-1010025--12471455

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 03.08.2026 | free |
| Pickup points | 06.08.2026 | 1.79 EUR |
| Courier delivery to door | 06.08.2026 | 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 blue housing, this component ensures reliable wire termination and efficient circuit distribution. It is built for durability and ease of use in professional electrical wiring projects.

## 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 environments and control panels. Designed to accommodate a 4mm2 cross-section, this terminal block provides a stable connection point for electrical circuits, ensuring consistent performance and safety in professional wiring installations. Its robust construction and blue housing make it an essential element for organized and efficient electrical distribution systems.
Advantages
This terminal block offers exceptional mechanical stability through its reliable screw-clamping mechanism, which ensures that wires remain firmly in place even under vibration. The compact design allows for high-density mounting on standard DIN rails, maximizing space efficiency within electrical enclosures. Furthermore, the high-grade insulating materials used in the housing provide excellent electrical safety and durability, making it suitable for long-term operation in demanding industrial settings.
Suitable for
Control panel wiring
Industrial automation systems
Power distribution boards
Electrical junction boxes
When it may not be suitable
This terminal block is not intended for use with wire sizes exceeding its 4mm2 capacity, as attempting to force larger conductors may damage the clamping mechanism. It is also not designed for direct exposure to extreme outdoor weather conditions or submerged environments without an appropriate protective enclosure.
Key specifications
Cross-section capacity: 4mm2
Connection type: Screw terminal
Color: Blue
Mounting style: DIN rail
How to use
To use the terminal block, first ensure that the power supply to the circuit is disconnected. Strip the insulation from the end of your wire to the appropriate length. Insert the conductor into the terminal opening and tighten the screw firmly using a compatible screwdriver to secure the connection. Verify that the wire is held tightly by giving it a gentle pull. Repeat the process for additional connections as required by your circuit design.
What to consider before purchase
Verify that your wire gauge is compatible with the 4mm2 specification.
Ensure you have the correct DIN rail type for mounting.
Confirm the total number of terminal blocks required for your specific circuit layout.
Usage recommendations
Always use a calibrated screwdriver to achieve the correct torque when tightening the screw terminals to prevent damage to the conductor or the terminal block itself.

## FAQ

### How much does the ONKA Elektrik MRK 4mm2 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 — 650 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 03.08.2026 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/12471455/68787511_large.webp