Theben | LUNA Twilight Switch 16A 110-230V AC | DIN Rail IP20
The Theben LUNA110PLUSEL is an analogue twilight switch that switches a lighting circuit according to measured ambient light level. It operates on 110V AC to 230V AC, occupies 2 modules on DIN rail, and switches up to 16A at 250V AC through a changeover contact. The LUNA110PLUSEL is supplied with a flush-mounted external light sensor and covers a switching brightness range of 2 to 50000 lux.
Lighting controlled by a fixed time switch gradually drifts out of step with sunset as the seasons shift, requiring somebody to return and readjust it. Car parks, signage, and yard lighting then operate through daylight, or leave the site dark early. The LUNA110PLUSEL measures ambient illumination through its external light sensor and switches on measured light level rather than clock time, adjustable between 2 and 50000 lux. Separate on and off delays of 0 to 20 minutes determine circuit response.
On a switchboard the LUNA110PLUSEL occupies 2 modules of DIN rail and lands its load lines in DuoFix spring terminals. A test function, plus permanent ON and OFF positions on the potentiometer, proves the circuit at commissioning without waiting for dusk. Zero-cross switching reduces wear on the relay contact and the lamps on circuits that cycle daily.
Features
- Analogue twilight switching — freely adjustable switching brightness across a 2 to 50000 lux setting range, set on the potentiometer.
- External light sensor included — the LUNA110PLUSEL ships with a flush-mounted light sensor, so no separate sensor purchase is needed.
- 16A switching capacity — rated 16A at 250V AC at unity power factor, and 16 AX for fluorescent lamp load.
- 2600W incandescent and halogen — carries incandescent and halogen lamp loads up to 2600W on the one channel.
- LED and energy-saving load limits — 600W for LED lamps above 2W, 50W for LED lamps under 2W, and 270W for energy-saving lamps.
- Adjustable switching delays — separate on and off delays, each settable from 0 to 20 minutes to suit the installation.
- Zero-cross switching — switches at the zero crossing to reduce wear on both the relay contact and the connected lamps.
- DuoFix spring terminals — load line connections land without screw torque, which speeds up termination inside a populated board.
- Changeover contact — a single changeover output on one channel, able to switch various phases, though not SELV circuits.
- Test and override settings — a test function plus permanent ON and permanent OFF positions on the potentiometer for commissioning and fault finding.
- IP20 rating — the LUNA110PLUSEL carries no weatherproof rating and must sit inside a switchboard or enclosure.
Where to use
- Car parks and yard lighting — the LUNA110PLUSEL brings area lighting on at dusk without anyone resetting a clock through the year.
- Shop signage and facade lighting — holds illuminated signage on from actual dusk, so display hours track daylight rather than a fixed setting.
- Pathway and access lighting — switches walkway, driveway, and entry lighting on the measured light level at the sensor position.
- Commercial and industrial external lighting — a 16A channel drives substantial external lighting circuits from a single board position.
- Rural sheds and farm yards — the sensor runs on cable up to 100 metres, so it can sit clear of the shed and read open sky.
- Time switch retrofits — the LUNA110PLUSEL replaces clock-based control on existing external lighting circuits during board upgrades.
The LUNA110PLUSEL is rated IP20 and carries no weatherproof rating, so it mounts inside a switchboard or enclosure and never in an exposed position. The switching output is not SELV, so it must not be used to switch safety extra-low voltage circuits. Sensor cable runs are limited to 100 metres, and ambient temperature at the unit must stay between -25°C and 55°C.
