Hensel PV Disconnection Box 70 A Mi AE 3223 3-Pole with Circuit Breaker and Grid Protection

Photovoltaic installations require a reliable point of isolation between the generator and the grid, especially when maintenance or emergency shutdown is needed. The Hensel PV Disconnection Box 70 A Mi AE 3223 solves this by integrating a main circuit breaker and an NA-Schutz (grid and system protection) in a single, compact enclosure. This unit is engineered for three-phase PV systems up to 48 kW, ensuring safe disconnection and compliance with VDE-AR-N 4105.

Who is it for

This disconnection box is intended for solar installers, electrical contractors, and PV system operators who need a robust, code-compliant AC disconnection solution for commercial or residential photovoltaic arrays. It suits wall-mounted installations in outdoor or harsh environments where IP65 protection is essential.

Main features

• Rated current 70 A, 3-pole, 400 V AC for three-phase PV systems
• Integrated main circuit breaker with 10 kA breaking capacity
• Built-in NA-Schutz (grid and system protection) compliant with VDE-AR-N 4105
• IP65 polycarbonate enclosure, UV-resistant and suitable for outdoor use
• Includes Type 2 surge protective device (SPD) for overvoltage protection
• Wall-mounting design with metric knockouts for cable entry
• Compliant with IEC 61439-2 for low-voltage switchgear assemblies

Specifications

• Rated operational current (Ie): 70 A
• Number of poles: 3
• Rated operational voltage (Ue): 400 V AC
• Rated insulation voltage (Ui): 690 V AC
• Rated impulse withstand voltage (Uimp): 6 kV
• Short-circuit breaking capacity (Icu): 10 kA
• Protection class: IP65
• Enclosure material: Polycarbonate (PC)
• Enclosure series: Mi Series
• Included components: Main circuit breaker, grid and system protection (NA-Schutz)
• Grid protection standard: VDE-AR-N 4105 compliant
• Mounting type: Wall mounting
• Cable entry: Metric knockouts/flanges
• Standards compliance: IEC 61439-2
• Ambient temperature range: -25 °C to +40 °C
• Max. PV generator power (approx.): Up to 48 kW (at 400V AC)
• Overvoltage protection: Integrated Type 2 SPD (Surge Protective Device)

Tips

When installing, ensure the box is mounted on a flat, stable surface and that all cable glands are properly sealed to maintain the IP65 rating. For optimal performance, verify that the PV system's maximum current does not exceed 70 A and that the grid protection settings align with local utility requirements.