# Promet NEF30-B2X 30mm Key-Operated Control Switch, 2NO, Non-Self-Resetting

**URL:** https://aio.lv/en/product--promet-w0-nef30-b-2x--12450226
**Data updated:** 2026-05-18 02:41 (EEST)
**Category:** Control Systems
**Manufacturer:** Promet
**Manufacturer code:** W0-NEF30-B 2X
**EAN:** 5900103033682
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 65.99 €
**Prices and availability valid until:** 2026-07-25 23:59
**Price without VAT (21%):** 54.54 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--promet-w0-nef30-b-2x--12450226

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 15.07.2026 | free |
| Pickup points | 20.07.2026 | 1.89 EUR |
| Courier delivery to door | 20.07.2026 | 4.99 EUR |

## Summary description

The Promet NEF30-B2X is a 30mm key-operated control switch designed for industrial control panels and automation systems. This non-self-resetting switch features two normally open (2NO) contacts, providing reliable manual control and security. Its robust construction ensures durability in demanding environments, making it an ideal solution for machinery operation and access control applications where a key-based safety mechanism is required.

## Long description

The Promet NEF30-B2X is a high-quality 30mm key-operated control switch engineered for industrial control panels and automation systems. This device provides a secure and reliable method for manual operation, ensuring that only authorized personnel can activate or deactivate specific machinery or processes. Featuring a non-self-resetting mechanism, the switch maintains its position until manually adjusted, offering consistent control in demanding industrial environments.
Advantages
The primary advantage of the Promet NEF30-B2X lies in its robust construction, which is designed to withstand the rigors of daily industrial use. The key-operated design adds a critical layer of security, preventing unauthorized access or accidental operation of sensitive equipment. With its two normally open contacts, the switch offers versatile integration into various electrical circuits, ensuring dependable performance and long-term durability in harsh conditions.
Suitable for
Industrial control panels and automation systems
Machinery operation and safety interlocks
Access control for electrical cabinets
Secure activation of industrial processes
When it may not be suitable
This switch is not intended for applications requiring momentary contact or automatic reset functions, as the non-self-resetting design requires manual intervention to change states. It is also not suitable for environments where the switch may be exposed to extreme chemical corrosion or submersion, as it is designed for standard industrial panel mounting.
Key specifications
Mounting diameter: 30mm
Contact configuration: 2NO (two normally open)
Operation type: Key-operated, non-self-resetting
Application: Industrial control and automation
How to use
To install the Promet NEF30-B2X, mount the switch into a standard 30mm hole on your control panel and secure it firmly using the provided hardware. Connect the electrical wiring to the two normally open contact terminals according to your circuit diagram. Once installed, insert the key and turn it to the desired position to close the circuit. The switch will remain in this position until the key is turned back manually.
What to consider before purchase
Verify that your control panel has a 30mm mounting hole available.
Ensure that the 2NO contact configuration meets the requirements of your electrical circuit.
Confirm that a non-self-resetting (maintained) operation is appropriate for your specific safety or control application.
Usage recommendations
Regularly inspect the key mechanism and contact terminals for signs of wear or debris accumulation to ensure smooth operation and reliable electrical conductivity over the lifespan of the device.

## FAQ

### How much does the Promet NEF30-B2X 30mm Key-Operated Control Switch cost, and is it available for purchase?

The price is 65.99 € (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 15.07.2026 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 Promet 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 Promet 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/12450226/68753001_large.webp