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Astronomical time switch SELEKTA 170 top2

The SELEKTA 170 top2 astronomical time switch from Theben with weekly program is easy to program using OBELISK top2 software. Between 35 % and 70 % of energy costs can be saved each year with night-time switch-off.


  • Order No. 1700100
  • Astronomical time switch with weekly program
  • 1 channel
  • 54 memory locations
  • 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
  • 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 170 top2 
Operating voltage230 – 240 V AC
Frequency50 – 60 Hz
Width2 modules
Installation typeDIN rail
Type of contactChangeover contact
Switching outputPotential-free and phase-independent
Opening width< 3 mm (µ)
ProgramWeekly program, Astronomical program
Program functionsON-OFF
Number of channels1
Number of memory locations54
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 V22 x 7 W, 18 x 11 W, 16 x 15 W, 16 x 20 W, 14 x 23 W
LED lamps< 2 W = 30 W or 2-8 W = 100 W or > 8 W = 120 W
Fluorescent lamp load (conventional) not corrected2300 VA
Fluorescent lamp load (conventional) series-corrected2300 VA
Fluorescent lamp load (conventional) parallel-corrected730 VA
Switching capacity mA
Shortest switching times1 min
Time accuracytypical ± 0.5 s/day (quartz)
Time basisQuartz
Stand-by consumption0,8 W
Memory card suppliedno
Test approvalVDE
Type of connectionDuoFix spring terminals
Keyboards4 touch buttons
Housing and insulation materialHigh-temperature resistant, self-extinguishing thermoplastic
Type of protectionIP 20
Protection classII as per EN 60 730-1
Ambient temperature-30 °C ´… +55 °C

Connection example



Tender textDOC word_2
Operating instructionsPDFacrobat_2
SoftwareZIP zip_netto

Scale drawings


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