# Unipolar junction box HiSmart NV821778 125A, single-string DC combiner for PV systems

**URL:** https://aio.lv/en/product--hismart-nv821778--10842248
**Data updated:** 2025-12-30 12:45 (EET)
**Category:** Solar Panel Accessories
**Manufacturer:** HiSmart
**Manufacturer code:** NV821778
**EAN:** 6942108747743
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 8.49 €
**Prices and availability valid until:** 2026-07-23 23:59
**Price without VAT (21%):** 7.02 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--hismart-nv821778--10842248

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 02.07.2026 | free |
| Pickup points | 07.07.2026 | 1.89 EUR |
| Courier delivery to door | 07.07.2026 | 4.99 EUR |

## Summary description

Unipolar junction box HiSmart NV821778 125A is a single-string DC combiner designed for photovoltaic installations. Rated for 125 A, it provides a protective housing and connection point for PV string output, simplifying wiring and improving safety. Suitable for rooftop and ground-mounted arrays, it aids in cable management, protection of conductors, and integration with inverters and protective devices.

## Long description

Unipolar junction box HiSmart NV821778 125A is a single-string DC combiner designed for photovoltaic installations. Rated for 125 A, the junction box provides a protected connection point for PV string outputs and simplifies wiring in electrical panels. It is intended for mounting on a DIN rail and offers a transparent cover for quick visual inspection of the cable connections. The housing is made of flame-retardant PA (nylon) and the brass-plated terminals ensure durable, corrosion-resistant electrical contact.
Advantages
The HiSmart NV821778 combines a compact, DIN-rail mountable design with a transparent cover that enables visual verification of reliable cable connections. Brass-plated terminals provide good conductivity and corrosion resistance while the PA nylon body meets V0 UL94 flame-retardant requirements. The product supports a wide voltage range suitable for DC PV systems and provides organized cable entry options for multiple conductor sizes.
Suitable for
Single-string DC combiner for photovoltaic (PV) strings
DIN‑rail mounting inside electrical distribution panels
Rooftop and ground-mounted solar arrays requiring string connection and cable management
Integration with inverters and DC protective devices
Key specifications
Nominal current: 125 A
Voltage rating: AC/DC 690–1000 V
Connected cable cross-sections: 1×(10–35 mm²) or 7×(2.5–16 mm²)
Installation: DIN‑rail mounting
Terminals: brass plated
Body material: PA (nylon), flame retardant, UL94 V0
Dimensions: 30 × 76.5 × 45.5 mm
How to use
Mount the junction box on a standard DIN rail inside the electrical panel. Route the PV string conductors into the designated entry points and secure them under the brass‑plated terminals according to the specified cross-sectional ranges. Tighten terminal fastenings to the torque recommended by the installation standards applicable in your region. Close the transparent cover to protect the connections while allowing visual inspection of the terminations.
Usage recommendations
Verify compatibility with system voltage and current requirements before installation. Use appropriate cable sizes within the stated ranges and follow local electrical codes and safety practices. For reliable performance, ensure terminals are properly tightened and periodically inspect connections through the transparent cover.

## FAQ

### How much does the Unipolar junction box HiSmart NV821778 125A cost, and is it available for purchase?

The price is 8.49 € (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 02.07.2026 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 HiSmart 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 HiSmart 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/10842248/60193043_large.webp