On a renovation site or a new construction, the choice of the Legrand switch range often arises at the time of ordering the equipment. Celiane, Mosaic, Neptune: three ranges, three installation logics, three levels of customization. The right choice depends on the type of installation (flush-mounted or surface-mounted), the number of points to be equipped, and the need for home automation or not.
Since the overhaul of the NF C 15-100 standard in September 2025, the minimum number of sockets per room has increased, particularly in kitchens and living rooms. Therefore, more points are equipped per housing, making the unit cost and availability of variations (dimmer, push button, specialized socket) more decisive than just design. Before placing an order, one can estimate a project with leprodestravaux to compare the overall budget based on the chosen range.
1. Celiane: the versatile range for customized installations
Celiane is the range that electricians most often install in mid to high-end residential settings. Its principle is based on a composable three-layer system: a mechanism, a cover, and a plate. Each element is chosen separately, allowing for a change in finish without touching the wiring.
The catalog of plates is wide: white, titanium, glass, leather, wood, colored metal. For a kitchen equipped with numerous sockets, the same mechanism is kept everywhere, and the plate is adapted to the ambiance of each room. In practice, this modularity comes at a cost: a complete point (mechanism + cover + plate) is significantly more expensive than a Mosaic or Neptune equivalent.
Where Celiane truly stands out is in home automation. The Celiane with Netatmo variant is natively compatible with Apple HomeKit, Amazon Alexa, and Google Home via the Legrand Home + Control app. Switches, dimmers, and shutter controls can be operated by voice or from a smartphone, without a third-party gateway.
- Connected lighting control (switch, dimmer, scene) remotely operable
- Roller shutter control integrated into the same wireless ecosystem
- Firmware updates via the app, without intervention on the electrical panel
Feedback varies on the durability of the plate clips after several disassemblies, but the mechanism itself remains reliable over time. Celiane is particularly suitable for projects where an evolving switch is desired, capable of integrating home automation today or later.
2. Mosaic: the reference equipment for professional installation
Mosaic is historically Legrand’s tertiary range, designed for offices, ERP, and technical premises. It is also found in residential settings when the budget is tight or when a large number of points need to be equipped quickly.
Its main advantage is the density of functions per unit. The 45 x 45 mm format allows for grouping multiple mechanisms on the same support: a switch, an RJ45 socket, and a power socket side by side, in a single frame. For a home office or workshop, this concentration capability is hard to match with Celiane or Neptune.
The functional catalog of Mosaic is the widest of the three ranges. It includes USB-C sockets, VMC controls, sockets for specialized circuits, presence detectors, and network patch modules. Mosaic covers uses that the other two ranges do not offer, particularly everything related to IT distribution and technical building management.
In return, aesthetic customization remains limited. The finishes are primarily white and antimicrobial white. Mosaic is not chosen to decorate a living room. It is chosen because there is a need for a push button switch, a dimmer, and a network socket on the same support, with quick wiring thanks to automatic terminals.
3. Neptune: the waterproof range for surface-mounted installations
Neptune meets a need that neither Celiane nor Mosaic directly cover: surface-mounted installation in humid or exposed environments. Garages, basements, laundry rooms, outdoor shelters, unheated technical rooms. Anywhere flush mounting is neither possible nor desirable.
Neptune boxes are rated IP55, which protects them against water splashes and dust. With the strengthening of IP requirements for garage and outdoor sockets in the revised NF C 15-100 standard (minimum IP44 required), Neptune meets this regulatory constraint without additional mounting.
The installation is simple: surface-mounted box fixed to the wall, direct connection of wires, closing the cover. No flush-mounting box to seal, no groove to create. For a garage renovation or adding sockets in an outbuilding, considerable time is saved compared to a flush installation.
- IP55 protection rating: suitable for water splashes and dusty environments
- Surface mounting without grooves, compatible with concrete, block, or wood walls
- Complete functional range: single switch, two-way switch, 2P+T socket, cable outlet
Neptune offers virtually no options for aesthetic customization. The standard color is gray. Neptune is not installed in a living room. But in a basement, pantry, or storage area, it is the only Legrand range that combines waterproofing and quick surface installation without having to DIY a third-party box.
The choice between these three ranges boils down to three questions: is the installation flush-mounted or surface-mounted, is the location humid or exposed, and does the project include home automation? Celiane covers personalized and connected residential needs, Mosaic handles dense technical configurations, and Neptune secures challenging environments. On the same site, one can mix the ranges according to the rooms.