Ceiling motion presence detector Legrand 999830 360°

Ceiling motion presence detector Legrand 999830 360° provides full-circle occupancy detection for ceiling-mounted installations. Designed to sense both motion and presence across a 360° field, this device integrates with lighting control circuits to automate illumination and improve energy efficiency in indoor spaces such as offices, corridors, stairwells and utility rooms.

Advantages

The detector offers all-round coverage from a ceiling position, reducing blind spots and providing reliable detection for typical room layouts. Its dual-mode sensing registers both movement and presence, enabling stable control of lighting even when occupants are relatively still. The unit is compatible with standard lighting control systems and is intended for straightforward installation in suspended or solid ceilings. Overall, it supports energy savings and convenient automatic switching without complex user interaction.

Suitable for

• Office open-plan areas and individual workspaces
• Corridors and passageways
• Stairwells and landings
• Utility rooms, storage areas and technical rooms

Key specifications

• Detection coverage: 360° ceiling field
• Mounting: ceiling-mounted for suspended or solid ceilings
• Sensing: motion and presence detection modes
• Typical application: automatic lighting control for indoor spaces
• Environmental use: indoor environments such as offices and corridors

How to use

Install the detector in a central ceiling position to maximize the 360° detection field and avoid placement near HVAC vents or direct sunlight sources that could affect sensing. Connect the device to the lighting control circuit following applicable wiring standards and local electrical codes. Configure sensitivity and time-out settings according to room usage patterns to balance responsiveness and energy savings. After commissioning, verify coverage by walking through the protected area and adjusting orientation or mounting height if necessary.

Usage recommendations

For best performance, place the sensor at the recommended ceiling height and away from reflective surfaces or heating vents. Adjust presence sensitivity for areas where occupants may remain relatively still, and set appropriate timeout intervals to reduce unnecessary switching. Follow national electrical installation rules during wiring and, where available, consult Legrand integration guidelines for compatibility with existing lighting control systems.