Time and light control > Twilight switches > DIN rail > Digital > LUNA 121 top2 RC EL

LUNA 121 top2 RC EL


  • Twilight switch with integrated weekly timer
  • External light sensor included in delivery
  • 1 channel
  • Integrated weekly timer
  • Variable lux values can be set for each day
  • for each day of the week
  • Fixed ON and OFF times (e.g. nighttime interruption)
  • can be programmed independent of brightness
  • 2 special programmes with yearly function
  • (e.g. 24.12.2007 to 6.01.2008): Variable lux values and switching times can be set for each special program
  • DCF77 or GPS radio controlled time via external antenna
  • Holiday and public holiday program with yearly function for fived and public holidayas dependent on Easter
  • Different summer/winter time rules can be selected or freely defined
  • Switching brightness digitally adjustable
  • Adjustable On and Off switching delay
  • to avoid switching errors caused by lightninh, car headlights etc. Preset 1 minute
  • Switching brightness and switching delay can be set separately for switching On and Off
  • Onscreen display of channel and switching status as well as current lux value
  • DuoFix spring terminals
  • for 2 conductors per connection terminal
  • Zero-cross switching for relay-saving switching and high lamp loads (not with 24 V devices)
  • Up to 4 sensors can be attached
  • Up to 10 devices can be connected to a digital sensor
  • Interface for OBELISK top2 memory card (PC programming)
  • 2. insertable switching program
  • Copying programs
  • Storing programs
  • External light sensor included in delivery
  • Extended brightness range
  • Permanent switching ON/OFF
  • Test function
  • (Permanent ON) to check the installation independently of set brightness value
  • Switching preselection
  • Display back light (can be turned off)
  • PIN coding
  • External input
  • for switches or buttons
  • Operating hour counter
  • with reminder function

Technical data

Operating voltage 230 – 240 V AC
Frequency 50 – 60 Hz
Number of channels 1
Number of memory locations 84
External inputs 1
Stand-by consumption ~1,3 W
Capacity loss max. 1,1 W
Program Weekly program
Additional program Extra/Holiday program
Time basis Quartz/DCF77
Setting range brightness 1 – 99000 lx
Preset brightness value 15 lx
Switch-on delay 0 – 59 min
Switch-off delay 0 – 59 min
Type of contact Changeover contact
Switching output Potential-free, not for SELV
Width 2 modules
Installation type DIN rail
Type of connection DuoFix spring terminals
Keyboards 4 touch buttons
Shortest switching times 1 min
Power reserve 10 years at 20 °C
Switching capacity

16 A (at 250 V AC, cos φ = 1), 10 A (at 250 V AC, cos φ = 0.6), 10 AX (Fluorescent lamp load)

Switching capacity min. ca. 10 mA
Incandescent lamp load 2600 W
Halogen lamp load 2600 W
Fluorescent lamp load (conventional) not corrected 2300 VA
Fluorescent lamp load (conventional) series-corrected 2300 VA
Fluorescent lamp load (conventional) lead-lag circuit 2300 VA
Fluorescent lamp load (conventional) parallel-corrected 800 VA 80 µF
LED lamp < 2 W 30 W
LED lamp 2-8 W 100 W
LED lamp > 8 W 120 W
Energy saving lamps 170 W
Fluorescent lamp load (electronic ballast) 650 W
Test approval VDE
Housing and insulation material High-temperature resistant, self-extinguishing thermoplastic
Ambient temperature -30 °C … +55 °C
Type of protection IP 20, sensor IP 66 (Front) | IP 40 (Back)
Protection class II, Sensor III
Max. cable length to sensor 100 m

Connection example

LUNA 121 top2 RC EL

Scale drawings

LUNA 121 top2 RC EL


Article number Data sheet Documents basket
Antenna top2 RC-GPS - Worldwide time synchronisation and positioning via receiving GPS satellite signal

Antenna top2 RC-GPS

Antenna top2 RC-DCF - Radio control via antenna with top2 RC devices: To ensure good reception, do not install the antenna
                                 in cellars or on distribution boxes. Connection is made via separate 2-wire, unscreened high-voltage power cable (max. 100
                                 m), up to 10 Theben top2 RC devices can be connected. Polarity, short-circuit and interruption of the antenna circuit are
                                 each visually displayed to help with installation.

Antenna top2 RC-DCF

Digital surface-mounted light sensor - Sensor rotatable

Digital surface-mounted light sensor

Digital flush-mounted light sensor - Spring terminals

Digital flush-mounted light sensor

Wall mounting kit 35 mm - Terminal box cover plate for assembly, sealable

Wall mounting kit 35 mm

Power unit top2 GPS - Required when connecting the antenna top2 RC-GPS to an individual TR 611 top2 RC, LUNA 121 top2 RC,
                                 LUNA 122 top2 RC or SELEKTA 171 top2 RC device (No additional power unit is required when connecting to a minimum of 2 devices)

Power unit top2 GPS

PC set OBELISK top2/3 - Switching programs created on the PC by means of the convenient OBELISK top2/3 software can be transferred
                                 via USB interface to the OBELISK top2 memory card or the Bluetooth OBELISK top3 and from the card to the time switch and vice
                                 versa. Thus no PC or laptop is required on-site. Programming and the program printout can be done comfortably from the desk

PC set OBELISK top2/3

Memory card OBELISK top2 - Individual memory card

Memory card OBELISK top2

Front panel kit - The front panel installation set is suitable for Theben distributor installation devices of 17.5 to 107.5
                                 mm width

Front panel kit



Format Download
Operating instructions (smartphone) PDF
Operating instructions PDF
Tender texts DOC
Software ZIP


Article number Data sheet Documents basket
LUNA 121 top2 RC EL 24V - Twilight switch with integrated weekly timer

LUNA 121 top2 RC EL 24V

LUNA 121 top2 RC AL - Twilight switch with integrated weekly timer

LUNA 121 top2 RC AL

LUNA 121 top2 RC AL 24V - Twilight switch with integrated weekly timer

LUNA 121 top2 RC AL 24V

LUNA 121 top2 RC EL - Twilight switch with integrated weekly timer

LUNA 121 top2 RC EL

  • Flush-mounted light sensor
Article number 1210200
Data sheet
Documents basket