The HF 3360 is a Steinel motion detector in a round white housing 12.6 cm across and 5.2 cm deep, built for surface mounting — straight onto a wall or ceiling, with no flush box. It senses movement with a 5.8 GHz wave rather than infrared, and it works as a bus device on a KNX installation.
Where and how high it goes
The manufacturer allows mounting on a wall, on a ceiling or in a corner at 2.0 to 4.0 m, and names 2.8 m as the optimum. Height decides the area covered: Steinel quotes a reach of Ø 8 m, roughly 50 m² — a figure to compare against the length of the corridor or basement passage one unit is meant to serve.
The detection field covers a full 360° around the unit with a 180° opening angle, and the manufacturer states crawl-under protection, meaning movement directly beneath the housing is also picked up. Radial and tangential reach are identical here at Ø 8 m, so it makes no difference whether someone walks towards the detector or across its field.
Why 5.8 GHz instead of infrared
The sensor emits a signal below 1 mW and reads its reflection, which lets it detect movement through glass, wood and lightweight partition walls. Infrared detectors respond to temperature differences and see nothing behind such barriers. The same principle means detection does not depend on the temperature difference between a person and the room, which matters in an unheated garage or in a stairwell in summer.
Power and setup on a KNX installation
Power and communication both come from the KNX bus, at a rated current of 12.5 mA. Running it therefore needs a KNX installation, not an ordinary 230 V lighting circuit. On the bus the detector offers two light outputs, a presence output, the brightness value, a day/night function and constant light control, plus a basic light function whose brightness is set between 0-100%.
Settings are made from ETS software, over the bus, with the service remote or through Smart Remote; no remote is included and one has to be bought separately. The built-in light sensor allows a twilight threshold between 2 and 1000 lx, and the threshold can also be learned in teach mode instead of entered as a number.
Housing and operating conditions
The housing is plastic in RAL 9003 white and carries IP54 protection, but Steinel specifies the unit for indoor use — the rating covers dust and splashes but is not an approval for open-air installation. The operating temperature range runs from -20 to 50 °C. The manufacturer gives a 5-year warranty.
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