Modular Flush-Mounted Distribution Box Legrand PRACTIBOX S 4×18 with White Door, MPN 137369

Legrand PRACTIBOX S 4×18 with white door is a flush-mounted modular distribution box designed to accommodate DIN-rail devices across four rows with 18 modules per row. Intended for residential and light commercial electrical installations, the enclosure provides a clean, standardized frame for mounting miniature circuit breakers, residual current devices and terminal blocks while keeping wiring organised and protected behind a lockable front panel.

Advantages

The enclosure supports a high-density layout of modular devices, allowing up to four rows of 18 modules each for clear separation of circuits. The flush-mount design reduces protrusion from walls and integrates smoothly into interior surfaces. A white door provides a neutral aesthetic suitable for most rooms, and the removable inner parts simplify installation and wiring. Materials and construction are designed to meet common electrical installation standards for safety and mechanical protection.

Suitable for

• Domestic electrical distribution in apartments and houses
• Small commercial premises such as offices, shops and studios
• Installation of multiple miniature circuit breakers and RCDs on DIN rails
• Retrofit projects where a flush-mounted solution is preferred

When it may not be suitable

This distribution box is not intended for outdoor use or for locations requiring specialised environmental protection such as high humidity, dust ingress or direct water exposure. It is also not designed for very high-current industrial switchgear or large electrical panels that require bespoke metal enclosures or additional ventilation and heat dissipation provisions.

Key specifications

• Configuration: 4 rows × 18 modules per row (DIN-modular format)
• Mounting type: Flush-mounted (recessed) installation
• Door colour: White
• Intended devices: DIN-rail modular devices such as MCBs, RCDs and terminal blocks
• Access: Front door for protected access to internal devices and wiring

How to use

Install the PRACTIBOX S in a prepared wall recess according to local electrical installation rules and mounting templates supplied by the manufacturer. Fix the enclosure securely, mount DIN rails and clip in modular devices in the required arrangement across the four rows. Route phase, neutral and protective conductors neatly to the devices and secure with appropriate terminals. Close the door after labelling circuits and verifying connections, and ensure earthing and cover seals are correctly fitted before energising the panel.

What to consider before purchase

• Confirm the number and type of DIN-rail devices you plan to install to ensure they fit within the 4×18 layout
• Verify wall depth and recess space for flush mounting and any required clearances behind the enclosure
• Check local regulations for required IP rating or additional protections if installing in damp or dusty areas
• Ensure compatibility with the intended mounting hardware and DIN-rail accessories

Usage recommendations

Use the distribution box for separating circuits logically, label each module clearly, and leave space for future expansion by planning device placement across the four rows. Carry out installation and final electrical connections by a qualified electrician in accordance with applicable standards and safety practices.