# Circuit breaker accessory Siemens 3NJ4912-1DA02 — auxiliary cover for 3NJ41 series

**URL:** https://aio.lv/en/product--siemens-3nj49121da02--8516196
**Data updated:** 2026-04-24 17:39 (EEST)
**Category:** Home & DIY Accessories
**Manufacturer:** Siemens
**Manufacturer code:** 3NJ49121DA02
**EAN:** 4011209652316
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 25.99 €
**Prices and availability valid until:** 2026-08-09 23:59
**Price without VAT (21%):** 21.48 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3nj49121da02--8516196

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 07.08.2026 | free |
| Pickup points | 12.08.2026 | 1.89 EUR |
| Courier delivery to door | 12.08.2026 | 4.99 EUR |

## Summary description

Siemens 3NJ4912-1DA02 is a circuit breaker accessory serving as an auxiliary/cover component compatible with the Siemens 3NJ41 series. It is intended to provide protective covering and finishing for breaker modules, ensuring correct installation and safe operation in electrical panels. Suitable for use in industrial and commercial switchgear assemblies.

## Long description

Siemens 3NJ4912-1DA02 is an auxiliary cover designed for use with the Siemens 3NJ41 series circuit breakers. This accessory provides a protective finishing element that helps maintain correct alignment and coverage of breaker modules within electrical panels and switchgear assemblies. It is intended for industrial and commercial installations where reliable mechanical protection and neat panel appearance are required.
Advantages
The auxiliary cover offers straightforward mechanical protection for exposed breaker ends and contributes to a consistent, finished look across a row of 3NJ41 series devices. Manufactured to fit the series’ form factor, it facilitates safe installation by covering gaps and reducing the risk of accidental contact with internal parts. The design supports compatibility with standard mounting and panel layouts used in commercial and industrial switchgear.
Suitable for
 Protection and finishing of Siemens 3NJ41 series circuit breaker installations
 Industrial electrical panels and commercial switchgear assemblies
 Renovation or maintenance tasks where damaged or missing covers need replacement
 Applications requiring a uniform appearance and additional mechanical protection for breaker rows
When it may not be suitable
This auxiliary cover is specific to the Siemens 3NJ41 product family and may not fit breakers from other series or manufacturers. It does not alter electrical characteristics, provide overload protection, or replace functional components of the breaker; its purpose is mechanical protection and panel finishing only.
Key specifications
 Function: Auxiliary/cover component for circuit breaker modules
 Compatibility: Designed for Siemens 3NJ41 series breakers
 Application environment: Industrial and commercial switchgear and electrical distribution panels
 Material characteristics: Rigid protective cover intended for mechanical protection and finishing (material type as specified by manufacturer)
 Mounting: Fits the form factor and mounting arrangement of 3NJ41 series devices
How to use
Install the auxiliary cover by aligning it with the mating edges of the 3NJ41 series breaker module and securing it according to the breaker series’ mounting provisions. Ensure power is isolated and follow all relevant electrical safety procedures before fitting or removing the cover. Verify that the cover sits flush with adjacent modules and does not interfere with breaker operation or access to functional controls.
What to consider before purchase
 Confirm compatibility with the exact 3NJ41 series breaker variant in your installation
 Ensure the cover meets the mechanical and environmental requirements of your switchgear (temperature, enclosure class)
 Check that replacing or adding the cover will not obstruct access to breaker controls or auxiliary devices
 Consider sourcing genuine manufacturer parts to maintain panel conformity and safety standards
Usage recommendations
Use this accessory only as a mechanical cover for 3NJ41 series breakers. Fit and secure it during scheduled maintenance or installation with power removed, and inspect periodically for damage or wear to maintain safe panel conditions.

## Specifications

| Feature | Value |
|---|---|
| Number of terminals | 1 |

### Design

| Feature | Value |
|---|---|
| Product colour | Multicolour |

## FAQ

### How much does the Siemens 3NJ4912-1DA02 circuit breaker accessory cost, and is it available for purchase?

The price is 25.99 € (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 07.08.2026 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. 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 Siemens 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 Siemens 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

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: product colour, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

### Where can I download the instructions for Siemens 3NJ4912-1DA02 circuit breaker accessory?

You can download the instructions in PDF format from the “Instructions” section on the product description page. The file contains complete information about installation, setup, and usage.

## Image

https://aio.lv/img/cache/product/8516196/59509804_large.webp