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Astronomical time switch SELEKTA 174 top3

The SELEKTA 174 top3 astronomical time switch from Theben with weekly program and two external inputs is easy to program using top3 App. The Astro function can be deactivated so that the SELEKTA can be used purely as a time switch.


  • Order No. 1740130
  • Astronomical time switch with weekly program
  • Astronomical time switch function (automatic calculation of sunrise and sunset times for the whole year)
  • Offset for adjusting of sunrise and sunset times
  • Position data via coordinates or country/city lists can be programmed
  • Fixed ON-OFF switching times can be programmed (e.g. night time interruption)
  • Simulation of switching times (calculated astronomical times and programmed ON/OFF switching times)
  • Reversible astronomical mode (evenings ON – mornings OFF or evenings OFF – mornings ON) or can be deactivated
  • DuoFix spring terminals
  • For 2 conductors each
  • Wire or strand (with or without wire end sleeve)
  • Wire diameter: 0.5 – 2.5 mm²
  • Button for releasing plug-in connection
  • Text-oriented user guidance in display
  • Preset date and time
  • fully operable without mains connection
  • Interface for OBELISK top2 memory card (PC programming)
  • 2. insertable switching program
  • Copying programs
  • Storing programs
  • 10 year power reserve (lithium battery)
  • Zero-cross switching for relay-saving switching and high lamp loads (not with 24 V devices)
  • Calculated astronomical switching times
  • Programmable ON-OFF switching times
  • Switching preselection
  • Permanent switching ON/OFF
  • Integrated operating hour counter
  • Reset option
  • Service function for monitoring maintenance intervals
  • Holiday program
  • Display back light (can be turned off)
  • PIN coding
  • Automatic summer/winter time changeover
  • can be deactivated
  • Date rule options are already stored for Europe, the USA and other countries
  • own date rule options or changeover around set dates are available

Technical data

SELEKTA 174 top3 
Operating voltage230 V AC
Frequency50 – 60 Hz
Width2 modules
Installation typeDIN rail
Type of contactChangeover contact
Switching outputPhase-independent
Opening width< 3 mm (µ)
ProgramWeekly program, Astronomical program
Program functionsON-OFF
Number of channels2
External inputs2
Number of memory locations56
Power reserve10 years
Switching capacity at 250 V AC, cos φ = 116 A
Switching capacity at 250 V AC, cos φ = 0,610 A
Incandescent/halogen lamp load 230 V2600 W
Energy saving lamps 230 V1100 W
LED lamps < 2 W50 W
LED lamps 2-8 W600 W
LED lamps > 2 W600 W
Switching capacity mA
Shortest switching times1 min
Time accuracytypical ± 0.5 s/day (quartz)
Time basisQuartz
Stand-by consumption~0.4 W
Memory card suppliedno
Type of connectionDuoFix spring terminals
Keyboards4 touch buttons
Housing and insulation materialHigh-temperature resistant, self-extinguishing thermoplastic
Type of protectionIP 20
Protection classII according to EN 60 730-1
Voltage230 V AC
Ambient temperature-30 °C … +60 °C

Connection example

SELEKTA 174 top3 Connection example  

Scale drawings



Operating instructionsPDF acrobat_2
SoftwareZIP zip_netto
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