Junction Box HiSmart NV821792 unipolar 250A for solar/energy systems

Unipolar junction box HiSmart NV821792 rated 250A provides a single-pole connection point for solar and power distribution systems. Designed for DIN-rail mounting in electrical panels or on equipment, the junction box organizes cable runs and allows secure, inspected terminations via a transparent cover. The housing is made from flame-retardant PA nylon and terminals are brass-plated for mechanical strength, corrosion resistance and good conductivity.

Advantages

The junction box supports high nominal current up to 250 A and a wide AC/DC voltage range, making it suitable for various energy installations. Its transparent cover permits visual inspection of connections, while the DIN-rail design enables compact mounting in distribution panels. Flame-retardant PA body and brass-plated terminals increase safety and long-term reliability under electrical load.

Suitable for

• Solar PV string junctions and combiner boxes
• Equipment and control panel cable branching
• Industrial and commercial power distribution installations

Key specifications

• Nominal current: 250 A
• Voltage rating: AC/DC 690–1000 V AIEC
• Connected conductor cross-sections: 1×(35–120 mm²) / 2×(6–35 mm²) / 5×(2.5–16 mm²) / 4×(2.5–10 mm²)
• Installation: DIN-rail mounting
• Terminals: brass plated
• Body material: PA (nylon), flame retardant (UL94 V0)
• Dimensions: 49 × 95 × 49 mm

How to use

Mount the HiSmart NV821792 on a standard DIN rail inside an electrical panel or enclosure. Route and strip conductors to the appropriate terminal positions according to the required connection scheme, then tighten terminals to the manufacturer’s recommended torque to ensure secure contact. Close the transparent cover to allow visual inspection while protecting connections from accidental contact.

Recommendations

Use this junction box within the stated current and voltage ratings, select conductor sizes that match the specified cross-section ranges, and follow local electrical codes and installation practices. Verify torque settings and inspect connections periodically for corrosion or loosening.