# ONKA Elektrik MTK Universal Screw Grounding Terminal Block 4mm2 Yellow-Green

**URL:** https://aio.lv/en/product--onka-elektrik-onka-1293--12451087
**Data updated:** 2026-05-18 02:55 (EEST)
**Category:** Home & DIY Accessories
**Manufacturer:** ONKA Elektrik
**Manufacturer code:** ONKA-1293
**EAN:** 5900103207571
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 5.99 €
**Prices and availability valid until:** 2026-08-03 23:59
**Price without VAT (21%):** 4.95 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--onka-elektrik-onka-1293--12451087

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 23.07.2026 | free |
| Pickup points | 28.07.2026 | 1.89 EUR |
| Courier delivery to door | 28.07.2026 | 4.99 EUR |

## Summary description

The ONKA Elektrik MTK universal screw grounding terminal block is designed for secure electrical connections in control panels and industrial installations. Featuring a 4mm2 capacity and a standard yellow-green color for grounding identification, this terminal ensures reliable conductivity and mechanical stability. It is an essential component for professional electrical wiring, providing a robust solution for grounding circuits in various industrial and commercial applications.

## Long description

The ONKA Elektrik MTK universal screw grounding terminal block is a high-quality component engineered for secure and reliable electrical connections in control panels, distribution boards, and industrial automation systems. Designed for a 4mm2 wire capacity, this terminal block features a robust screw connection mechanism that ensures excellent mechanical stability and consistent electrical conductivity. The distinct yellow-green color coding adheres to international safety standards, allowing for immediate identification of grounding circuits within complex wiring configurations.
Advantages
This grounding terminal block offers exceptional durability and performance in demanding environments. Its compact design allows for efficient space utilization on standard mounting rails, making it an ideal choice for dense wiring layouts. The high-grade materials used in its construction provide resistance to vibration and thermal stress, ensuring long-term operational reliability. Furthermore, the screw-clamp technology facilitates easy installation and maintenance, providing a secure grip on conductors to prevent accidental disconnections.
Suitable for
Industrial control panels and automation cabinets
Electrical distribution systems in commercial buildings
Grounding applications in machinery and equipment
DIN rail mounted electrical installations
When it may not be suitable
This terminal block is specifically designed for grounding purposes and should not be used for phase or neutral power distribution. It is intended for use with copper conductors within the specified cross-section range and may not be compatible with specialized high-current or high-voltage applications that require different terminal types.
Key specifications
Wire capacity: 4mm2
Connection type: Screw terminal
Color: Yellow-Green
Mounting: DIN rail
Application: Grounding
How to use
To install the terminal block, snap it onto a standard DIN rail until it clicks securely into place. Strip the insulation from the end of your grounding conductor according to the manufacturer's recommended length. Insert the wire into the terminal opening and tighten the screw using a compatible screwdriver until the conductor is firmly clamped. Ensure that the connection is tight and that there is no loose wire exposed outside the terminal housing.
What to consider before purchase
Verify that the wire cross-section matches the 4mm2 capacity
Ensure the mounting rail type is compatible with the terminal design
Confirm that the yellow-green color coding meets your specific project safety requirements
Usage recommendations: Always ensure that the power supply is disconnected before performing any wiring work. Regularly inspect terminal connections in industrial environments to ensure screws remain tightened, especially in areas subject to high levels of vibration.

## FAQ

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

The price is 5.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 143 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 23.07.2026 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 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

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