JUNG KNX Universal Automatic Switch 2.20 m LS 3281-1 WW (LS3281-1WW)

KNX presence detector with 360° detection and integrated brightness sensor for automatic lighting control. The JUNG LS 3281-1 WW combines motion and presence detection with constant light control in a flush-mounted device for KNX bus systems.

Advantages

360° detection angle and adjustable sensitivity ensure reliable switching based on presence and ambient light. With a detection range of up to 12 m for motion and 8 m for presence at the recommended mounting height of 2.20 m, it covers large areas efficiently. The integrated brightness sensor (10–2000 lux) enables constant light control, while the adjustable time delay from 10 seconds to 1092 minutes offers flexibility for various applications. Additional functions include short-term presence, scene recall, and HVAC control.

Suitable for

• Automatic lighting control in offices, corridors, and meeting rooms
• Presence-dependent HVAC and scene management in KNX installations
• Flush-mounted ceiling installation in dry indoor environments

Key specifications

• KNX bus voltage: 21–30 V DC, current consumption approx. 10 mA
• Detection angle: 360°, sensor technology: passive infrared (PIR)
• Brightness sensor range: 10–2000 lux
• Adjustable time delay: 10 s to 1092 min
• Housing material: thermoplastic (PC-GF15), colour: alpine white
• Protection rating: IP20, operating temperature: -5 °C to +45 °C

Recommendations

Mount at a height of 2.20 m for optimal detection coverage. Configure via ETS software to integrate with KNX systems for lighting, HVAC, and scene control.