# Siemens 3NA3144 NH Size 1 Safety Fuse, 250A, 500V, gG Class

**URL:** https://aio.lv/en/product--siemens-3na3-144--3271331
**Data updated:** 2026-05-18 02:49 (EEST)
**Category:** Electronics Accessories
**Manufacturer:** Siemens
**Manufacturer code:** 3NA3 144
**EAN:** 4001869056050
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 23.99 €
**Prices and availability valid until:** 2026-07-31 23:59
**Price without VAT (21%):** 19.83 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3na3-144--3271331

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 21.07.2026 | free |
| Pickup points | 24.07.2026 | 1.89 EUR |
| Courier delivery to door | 24.07.2026 | 4.99 EUR |

## Summary description

The Siemens 3NA3144 is a high-performance NH size 1 safety fuse designed for reliable electrical circuit protection. Rated for 250A and 500V, this gG class fuse features non-insulated lugs and a standard design, ensuring effective short-circuit and overload protection in industrial power distribution systems. This package contains one unit, providing a robust solution for demanding electrical infrastructure requirements.

## Long description

The Siemens 3NA3144 NH size 1 safety fuse is a high-performance component engineered to provide reliable protection for electrical circuits in industrial environments. With a rated current of 250A and a voltage rating of 500V, this gG class fuse is designed to handle both overload and short-circuit conditions effectively. Its standard design and non-insulated lugs ensure compatibility with a wide range of industrial power distribution systems, offering a robust solution for maintaining safety and operational continuity in demanding electrical infrastructures.
Advantages
This safety fuse offers exceptional reliability and durability, making it an essential component for protecting sensitive electrical equipment. The gG class classification ensures full-range protection, meaning the fuse is capable of interrupting all currents from the lowest fusing current up to its rated breaking capacity. Its robust construction and standardized NH size 1 dimensions allow for easy integration into existing switchgear and fuse bases, minimizing downtime during installation or replacement.
Suitable for
Industrial power distribution systems
Protection of electrical cables and power lines
Switchgear and control cabinet installations
Heavy-duty electrical infrastructure
This fuse may not be suitable for applications requiring specialized fast-acting characteristics, such as protecting sensitive semiconductor devices, where aR class fuses are typically required. Additionally, it is not intended for use in low-voltage residential circuits that do not utilize standard NH fuse bases.
Key specifications
Rated current: 250A
Rated voltage: 500V
Fuse size: NH 1
Operating class: gG
Terminal type: Non-insulated lugs
To use the Siemens 3NA3144, ensure that the power supply is completely disconnected before installation. The fuse should be inserted into a compatible NH size 1 fuse base using an appropriate insulated fuse handle or extraction tool. Verify that the fuse is seated firmly and that all electrical connections are tightened to the manufacturer's specified torque settings to prevent overheating.
What to consider before purchase
Verify that the fuse base is compatible with NH size 1 dimensions
Ensure the 250A current rating matches your circuit requirements
Check that the 500V voltage rating is sufficient for your application
Confirm that the gG class is appropriate for your specific protection needs
For optimal performance and safety, always replace fuses with the exact same type and rating. Regularly inspect fuse bases for signs of oxidation or heat damage to ensure a secure electrical connection.

## Specifications

| Feature | Value |
|---|---|
| Package weight | 439 g |
| Product colour | Multicolour |
| Purpose | High voltage |
| Package depth | 68 mm |
| Package height | 153 mm |
| Package width | 143 mm |
| Quantity per pack | 1 pc(s) |

## FAQ

### How much does the Siemens 3NA3144 NH Size 1 Safety Fuse 250A 500V cost, and is it available for purchase?

The price is 23.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 3 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 21.07.2026 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 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

## Image

https://aio.lv/img/cache/product/3271331/58312205_large.webp