Typical 380V distribution boxes range from compact wall-mounted units around 200×200×120 mm to large freestanding cabinets up to 2200×1800×600 mm, depending on application and manufacturer.

Standard and Typical Sizes

Wall-mounted distribution boxes for 380V systems often have dimensions in the range of 200 × 200 × 120 mm up to 800 × 600 × 300 mm, suitable for smaller industrial or commercial installations where space is limited . Freestanding or floor-standing cabinets designed for higher current ratings and multiple circuits typically range from 1600–2200 mm in height, 600–1800 mm in width, and 300–600 mm in depth . These larger enclosures accommodate multiple breakers, contactors, relays, and measurement instruments, providing flexibility for industrial power distribution .

Manufacturer-Specific Example: XL-21 Series

The XL-21 low-voltage distribution box rated for 380V and 800A is a common industrial solution. It features a modular, dustproof cabinet with IP54 protection, constructed from cold-rolled steel. While exact dimensions can be customized, the standard XL-21 configuration is designed for efficient space utilization, allowing easy installation, cable termination, and future expansion . The cabinet supports flexible combinations of circuit breakers, contactors, and relays according to the single-line diagram of the installation.

Considerations for Choosing Dimensions

• Internal layout: Ensure enough space for breakers, busbars, and wiring bend radius.
• Future expansion: Larger cabinets allow adding circuits without replacing the enclosure.
• Installation type: Wall-mounted units are smaller, while floor-standing cabinets are used for high-capacity industrial setups.
• Environmental protection: IP rating affects enclosure thickness and size; dustproof or splash-proof designs may require slightly larger dimensions . In summary, the dimensions of a 380V distribution box vary widely depending on current rating, number of circuits, and installation type. For small installations, compact wall-mounted boxes suffice, while industrial applications often require large freestanding cabinets like the XL-21 series, which can be customized to meet specific project requirements .