Standard Dimensions of International Distribution Boxes

International distribution boxes typically follow IEC standards, with module capacities ranging from 4 to 54, IP ratings up to IP65, and dimensions standardized for DIN rail mounting.Module Capacity and TypesDistribution boxes are designed to house modular components such as circuit breakers and isolators. Common module capacities include 4, 6, 8, 12, 18, 24, 36, and 54 modules . Boxes are available in single-row or multi-row configurations, with compact frames for larger module counts . Types include TOP-TS, TOP-TF, TOP-LS, TOP-PS, TOP-PF, and TOP-S, ranging from 1-way to 36-ways .DimensionsStandard dimensions vary depending on module count and manufacturer, but typical ranges include:Width: 65 mm to 361 mmHeight: 65 mm to 254 mmDepth: Adjusted for isolator frame sizes (e.g., 16A–38A vs 40A–65A) to ensure proper DIN rail installation . Boxes are designed to accommodate TH35x7.5 DIN rails, with symmetrical rails for single-row enclosures and compact frames for multi-row enclosures .Material and ConstructionABS or polycarbonate (PC) enclosures, halogen-free, with RAL 7035 grey base and frame .Transparent windows made of UV-protected polycarbonate for outdoor use, compliant with ISO 4892-2 for UV resistance .Smooth or metric-threaded surfaces for mounting flexibility .Protection RatingsIngress Protection (IP): Commonly IP65, providing dust-tight and water-resistant protection .Impact Resistance (IK): Often IK10, ensuring high mechanical protection .Glow wire tested for fire safety compliance .DIN Rail and Mounting ConsiderationsDIN rails must match the isolator frame size; frame size 1 (16A–38A) and frame size 2 (40A–65A) require different rail mounting due to depth differences .Boxes are supplied pre-assembled and can be mounted on walls or panels, with individual packaging or bundled shipping .SummaryInternational distribution boxes are standardized to ensure compatibility with modular electrical components, robust protection, and ease of installation. Key specifications include module capacity, IP/IK ratings, DIN rail compatibility, and material type, with dimensions tailored to the number of modules and frame sizes. These standards facilitate global interoperability and compliance with low-voltage directives such as 2014/35/EU .