Standard dimensions of XM type distribution boxes

XM distribution boxes vary in size depending on series and module count, typically ranging from small single-phase boxes to larger three-phase units, with approximate dimensions from 200–600 mm in height, 150–400 mm in width, and 80–200 mm in depth.

Overview

XM series distribution boxes are designed for residential, commercial, and industrial indoor power distribution, supporting single-phase and three-phase systems with rated voltages of 220/380 V and currents up to 250 A for standard units, and up to 630 A for larger MCCB boxes . They can be surface-mounted or recessed, and their modular design allows installation of miniature circuit breakers (MCBs) or other control devices .

Approximate Dimensions by Series

• XM1–XM2 series: Economical switch distribution boxes for small residential or office applications. Typically height: 200–300 mm, width: 150–250 mm, depth: 80–120 mm. These boxes accommodate standard 18 mm MCB modules and 86-type sockets .
• XM5 series: Transparent cover boxes with exposed switch handles for easy observation. Slightly larger to allow visibility and handle operation, generally height: 300–400 mm, width: 200–300 mm, depth: 100–150 mm .
• Industrial MCCB boxes: For higher current applications (up to 630 A), often used in factories or substations. Approximate height: 400–600 mm, width: 300–400 mm, depth: 150–200 mm .

Structural Features Affecting Size

• Three-body detachable structure: Box bottom, mounting bracket, and cover allow flexible installation and adjustment for uneven walls .
• Knock-out holes: Present on top and bottom for cable entry, which may slightly increase overall dimensions depending on installation .
• Modular design: The number of MCB modules determines width; more modules require wider boxes .
• Material thickness: Metal boxes typically use 2 mm steel plates, which slightly affects internal usable space .

Installation Considerations

• Surface-mounted: Adds minimal extra depth for wall clearance.
• Recessed: Requires wall cavity slightly larger than box dimensions for proper fitting.
• Adjustable guide rails: Allow horizontal and depth adjustment to accommodate uneven wall surfaces . In summary, while exact dimensions vary by series and module configuration, XM distribution boxes generally fall within 200–600 mm height, 150–400 mm width, and 80–200 mm depth, with larger industrial units at the upper end of this range. These estimates provide a practical reference for planning installation space and selecting the appropriate series for your application .