# CNC NV821921 Residual Current Breaker with Over-Current 4-Pole 16A C-Curve 30mA 6kA

**URL:** https://aio.lv/en/product--cnc-nv821921--12659990
**Data updated:** 2026-09-10 04:20 (EEST)
**Category:** Other goods
**Manufacturer:** CNC
**Manufacturer code:** NV821921
**EAN:** 6942034324100
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 33.49 €
**Prices and availability valid until:** 2026-12-04 23:59
**Price without VAT (21%):** 27.68 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--cnc-nv821921--12659990

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 11.11.2026 | free |
| Pickup points | 16.11.2026 | 1.99 EUR |
| Courier delivery to door | 16.11.2026 | 4.99 EUR |

## Summary description

CNC NV821921 residual current breaker with over-current protection, designed for electrical distribution systems. Features a 4-pole configuration, 16A rated current, class C tripping characteristic, 30mA residual current sensitivity, and 6kA breaking capacity. Ideal for safeguarding electrical circuits against overloads, short circuits, and earth leakage faults in residential and commercial applications.

## Long description

The CNC NV821921 residual current breaker with over-current protection is an essential component designed for modern electrical distribution systems. This 4-pole device combines overload, short-circuit, and earth leakage protection into a single unit, ensuring comprehensive safety for residential and commercial electrical installations. Built with reliable materials, it features an anti-mistake contact terminal block and clear contact position indication to simplify operation and maintenance.
Advantages
This residual current breaker provides combined protection against multiple electrical hazards, significantly reducing the risk of equipment damage and electrical shocks. The robust housing is manufactured from flame-retardant materials that offer high temperature and impact resistance for long-lasting durability. Visual status indicators clearly show the operational state with red for closed and green for opened contacts. Designed for standard installation, it accommodates flexible wiring options including cable and pin-type busbar connections up to 35mm².
Suitable for
Residential electrical distribution boards
Commercial building sub-circuits
Safeguarding circuits against overloads and short circuits
Protection against earth leakage and residual currents
This device may not be suitable for industrial environments requiring higher breaking capacities exceeding 6kA, or for non-standard operating voltages outside the specified AC 230 V range.
Key specifications
4 poles configuration
Rated current: 16 A
Tripping characteristic: Class C
Rated voltage: AC 230 V
Residual current sensitivity: 30mA
Rated short-circuit capacity: 6000 A
Mechanical life: 10000 cycles
Electrical life: 4000 cycles
Ingress protection: IP20
Operating temperature range: -25°C to +70°C
Dimensions: 82 x 72 x 78 mm
Installation must be performed by a qualified electrician in compliance with relevant electrical standards. Mount the unit securely onto a standard 35mm DIN rail following the EN 60715 specification. Ensure that incoming supply wires or pin-type busbars are properly stripped and securely connected to the top terminals with a maximum cross-sectional area of up to 35mm².
What to consider before purchase
Verify that the 16A rated current matches your specific circuit load requirements
Check that the 30mA residual current sensitivity meets your safety standards
Confirm compatibility with standard 35mm DIN rail enclosures
Ensure the 4-pole configuration aligns with your electrical distribution system design
Always disconnect the main power supply before performing any installation, maintenance, or testing procedures on the residual current breaker. Periodically test the device functionality using the built-in test mechanism to ensure reliable ongoing protection.

## FAQ

### How much does the CNC NV821921 Residual Current Breaker cost, and is it available for purchase?

The price is 33.49 € (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 11.11.2026 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/12659990/69924266_large.webp