{{ totalProductsCount }}

In cart {{totalProductsCount}} item(s)

Total:
{{sum | formatAmount}}

Your cart is empty

header-product CNC NV821709 Surge Protection Device 3P Class B 30-60 kA 385VAC
35.99 €

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

CNC NV821709 Surge Protection Device 3P 385VAC Photo 1
Keep track of price changes You keep track of price changes
Watch the price drop

Leave your address - as soon as the price of the product goes down, you'll know about it right away

You keep track of price changes

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

{{email}}
You keep track of price changes

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

{{email}}
{{selectedOffer && selectedOffer.price | formatAmount}}

Short 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.
Available for order: 5 pcs.
Warranty: 2 Years
SKU: 12659952
Manufacturer: CNC
free shipment

Cheapest delivery:

Unisend LV

Pick-up points

Unisend LV

Cost

1.99 €

Deliver

{{selectedOffer.parcelStationDeliveryString}}

Customer service center
2b. Kengaraga str., Riga, Latvia, LV-1063
28.10.2026 {{selectedOffer.officeDeliveryString}}
free
Courier Delivery Please note that in case of a large parcel additional delivery costs may apply!
02.11.2026 {{selectedOffer.courierDeliveryString}}
From 4.99 €
Parcel couriers
Unisend LV / Venipak Pickup LV / Venipak Locker LV / DPD Paku skapis / Omniva LV / Latvijas Pasts pakomāts / Latvijas Pasts nodaļa
02.11.2026 {{selectedOffer.parcelStationDeliveryString}}
From 1.99 €
payment
Payment Methods:
Bank transfer, Bank cards on-line, Apple Pay, Google Pay
Together cheaper
{{product.price | formatAmount}}
{{product.title}}
{{productBundle.reference.specialPrice | formatAmount}}
{{productBundle.title}}
{{productBundlePreviousPrice | formatAmount}}
{{productBundleSpecialPrice | formatAmount}}

You saving {{productBundleYouSave | formatAmount}}

Product information

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.

Description

Machine translation.

Similar products

{{product.title}}
Show details Hide details

{{highlightedFeature.featureTitle}}:

{{getProductFeatureValueById(product, highlightedFeature.featureId)}}

{{product.price | formatAmount}}

Product comparison

Surge protection devices from the CNC NV821 series are engineered to secure electrical installations against lightning surges and transient overvoltages. The primary differences among the compared models involve pole configurations, operating voltages, and current types (AC or DC), while the Class B protection rating remains a consistent core feature across the lineup.

⚙️ Below is a comparison of technical characteristics, detailing pole configurations, operating voltages, discharge capacities, and practical applications.

Comparison parameterCNC NV821709 (3P)CNC NV821693 (2-Pole)CNC NV821716 (4P)CNC NV821686 (1-Pole)CNC NV821723 (1-Pole DC)CNC NV821754 (4P DC)Practical significance
System typeThree-phase AC networkTwo-pole AC networkFour-phase AC networkSingle-phase AC networkPhotovoltaic (DC) systemsPhotovoltaic (DC) systemsDetermines compatibility with the specific electrical grid type.
Pole configuration3 poles (3P)2 poles4 poles (4P)1 pole1 pole (DC)4 poles (DC)Affects wiring requirements and the number of protected lines.
Protection classClass BClass BClass BClass BClass BClass BDelivers a consistently high level of primary protection against high-energy surges.
Operating voltage385VAC385VAC385VAC385VAC1000VDC1000VDCAC models suit standard power grids, whereas DC versions target solar setups.
Discharge capacity30-60 kA30-60 kA30-60 kA30-60 kA60-1000 kA60-1000 kADC versions feature higher discharge capacity tailored for heavy-duty renewable installations.

◎ The table below evaluates the suitability of each product for different user needs and application scenarios.

Use caseRecommended productWhy
Three-phase commercial and residential networksCNC NV821709 Surge Protection Device 3P Class B 30-60 kA 385VACSuits standard three-phase AC distribution lines, providing balanced protection without neutral switching.
Two-pole AC networksCNC NV821693 Surge Protection Device 2-Pole Class B 30-60 kA 385VACOptimal for two-wire AC connections in residential or industrial environments.
Four-pole AC networks with neutralCNC NV821716 Surge Protection Device 4P Class B 30-60 kA 385VACRequired when protection must cover both phase lines and the neutral conductor.
Single-phase AC linesCNC NV821686 1-Pole Class B Surge Protection Device 385VAC 30-60 kAIdeal for safeguarding individual phase lines within compact distribution panels.
Solar panels and DC systems (1 pole)CNC NV821723 DC Surge Protection Device 1-Pole Class B 1000VDC 60-1000kAEngineered specifically for photovoltaic direct current systems and high-voltage DC protection.
Solar panels and DC systems (4 poles)CNC NV821754 DC Surge Protection Device 4P Class B 1000VDC 60-1000kAProvides comprehensive multi-pole surge mitigation for renewable energy and solar distribution setups.
The CNC NV821709 is best suited for three-phase AC electrical installations requiring Class B protection across three conductors. Choose this model if your setup relies on a three-phase connection without dedicated neutral switching, while single-phase, four-pole, or solar installations will require alternative configurations from the same series.
Might be useful
{{product.manufacturerName}}
{{product.categoryName}}
{{product.title}}
{{product.specialPrice}}
{{product.price}}

Customer reviews

Customer questions

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 28.10.2026 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. We will assist with consultation, warranty claim processing, and coordination with certified service centers.
warranty
14-Day Return Policy We are confident in our quality, but if the purchase doesn’t fit — you have 14 days to return the product with peace of mind.
shipping
Fast Delivery Get your orders as quickly as possible — right to your door, parcel lockers, or pickup points across Latvia and the EU.
payment
Secure Payment Pay the way you prefer: cash, VISA, MasterCard, Apple Pay, Google Pay, bank transfer, or 0% installment plan.
warranty
Quality Since 2008 AiO.lv has been on the market for over 18 years and has earned trust — with more than 6000 genuine positive reviews on Google.