# CNC NV821709 Surge Protection Device 3P Class B 30-60 kA 385VAC

**URL:** https://aio.lv/en/product--cnc-nv821709--12659952
**Data updated:** 2026-09-10 04:20 (EEST)
**Category:** Other goods
**Manufacturer:** CNC
**Manufacturer code:** NV821709
**EAN:** 6942034339098
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 35.99 €
**Prices and availability valid until:** 2026-11-23 23:59
**Price without VAT (21%):** 29.74 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--cnc-nv821709--12659952

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 02.11.2026 | free |
| Pickup points | 05.11.2026 | 1.99 EUR |
| Courier delivery to door | 05.11.2026 | 4.99 EUR |

## Summary description

CNC NV821709 three-phase surge protection device designed for electrical system safety. Features Class B protection with a discharge capacity of 30 to 60 kA and a rated voltage of 385VAC. Suitable for safeguarding commercial and residential electrical installations against lightning surges and transient overvoltages.

## Long description

The CNC NV821709 Surge Protection Device 3P Class B 30-60 kA 385VAC is engineered to protect electrical installations from severe voltage spikes, transient overvoltages, and nearby lightning strikes. Designed for three-phase electrical systems, this Class B surge protection device is typically installed in the incoming line low-voltage distribution box of a building to safely divert high lightning stroke currents away from sensitive equipment.
Advantages
This surge protection device offers reliable defense against high-energy electrical disturbances, ensuring the continuous and safe operation of connected electrical devices. Built with a robust design, it supports high maximum discharge currents up to 60 kA and operates efficiently across a wide temperature range from -40°C to +85°C. Its standard 35mm DIN rail mounting ensures straightforward installation within existing low-voltage distribution panels, while compatibility with multiple system types adds to its versatility.
Suitable for
Safeguarding residential electrical installations against lightning surges
Protecting commercial building power distribution systems
TT, IT, TN-S, TN-C, and TN-C-S electrical network configurations
Incoming line low-voltage distribution boxes
When it may not be suitable
This device is not designed for single-phase electrical systems as it is specifically configured as a three-phase unit. It is also unsuitable for applications requiring fine-level internal equipment protection without a primary or secondary distribution stage upstream.
Key specifications
Number of poles: 3
Protection class: B
Maximum continuous operating voltage: 385 V AC
Nominal discharge current: 30 kA
Maximum discharge current: 60 kA
Voltage protection level: \<= 2.2 kV
Response time: \<25 ns
Frequency: 50/60 Hz
Operating temperature range: -40°C to +85°C
Relative humidity: \<95% at 25°C
Mounting type: 35mm DIN rail
Wire cross-section capacity: up to 6-10 mm²
Dimensions: 54 x 90 x 67 mm
How to use
Installation should be performed by a qualified electrician in accordance with applicable electrical standards and safety regulations. The device is mounted onto a standard 35mm DIN rail inside the incoming line low-voltage distribution box. Connect the appropriate electrical wires with a cross-section of up to 6-10 mm² securely to the contacts, ensuring proper alignment with the system type such as TT, IT, TN-S, TN-C, or TN-C-S before energizing the circuit.
What to consider before purchase
Verify that your electrical system is a three-phase configuration compatible with 385VAC rated devices
Check available space on the 35mm DIN rail within your distribution box for physical dimensions of 54 x 90 x 67 mm
Ensure compatibility with your specific network system type among TT, IT, TN-S, TN-C, and TN-C-S
Usage recommendations
Regularly inspect the surge protection device during routine electrical maintenance checks to ensure proper operational status and secure wire connections within the distribution box.

## FAQ

### How much does the CNC NV821709 Surge Protection Device 3P 385VAC cost, and is it available for purchase?

The price is 35.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 5 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 02.11.2026 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 CNC 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 CNC 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/12659952/69924224_large.webp