Dimensions and Specifications of Integrated Distribution Box Shell

Integrated distribution box shells typically follow modular standards with dimensions based on the number of modules, DIN rail compatibility, and IP rating requirements.

Typical Dimensions and Module Capacities

Integrated distribution boxes are designed to house circuit breakers and other electrical components in a compact, standardized enclosure. Common module capacities include 4, 6, 8, 12, 18, 24, 36, and 54 modules, with each module generally occupying a width of 18mm on a standard TH35 DIN rail . The height and depth of the shell vary depending on the number of rows and whether the box is intended for indoor or outdoor use, but typical dimensions for indoor steel boxes are around 300–600 mm in height, 200–400 mm in width, and 100–200 mm in depth . Plastic enclosures for outdoor use often follow similar modular widths but may have reinforced walls for IP65–IP67 protection .

Structural Features

• Material: Steel (1.2 mm cold-rolled) for indoor boxes or high-impact polycarbonate/ABS for outdoor waterproof boxes .
• DIN Rail Compatibility: Standard 35mm TH rails for mounting MCBs and other modular devices .
• Mounting: Flush or wall-mounted, with integrated mounting rails and reinforced frames to prevent warping under temperature fluctuations .
• Ingress Protection: Indoor boxes typically IP40, while outdoor boxes are designed for IP65–IP67, ensuring protection against dust and water jets .
• Cable Entry: Precision-drilled ports for tight-fitting glands, often with sloped edges or drainage channels to prevent water accumulation .
• Locking Mechanisms: Multi-point latching systems to maintain a consistent seal and prevent moisture ingress .

Summary

The standard dimensions of integrated distribution box shells are largely determined by the number of modules, DIN rail spacing, and intended application (indoor vs. outdoor). While widths are modular (multiples of 18mm per module), heights and depths vary to accommodate rows of breakers and ensure proper ventilation and safety. Material choice, IP rating, and structural reinforcements are critical for durability and compliance with international standards .