TR 644 top2


  • Digital time switch with yearly and astronomical time program
  • 4 channels
  • 4 external inputs
  • Connectable sensors (external selector switch, sequence timer)
  • Connectable switches (ON or OFF permanent switching)
  • 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
  • 800 memory locations
  • Interface for OBELISK top2 memory card (PC programming)
  • 2. insertable switching program
  • Copying programs
  • Storing programs
  • 8 year power reserve (lithium battery)
  • Zero-cross switching for leay-saving switching and high lamp loads (not with 24 V devices)
  • 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
  • ON-OFF switching times
  • Pulse program
  • Cycle program
  • Extensive yearly clock functions
  • Basic weekly program and 14 different weekly programs with priority levels and date ranges
  • Permanent ON / permanent OFF with highest priority via date range program option
  • fixed and variable public holidays, public holidays dependent on Easter, day and date ranges with serial pattern
  • Public holiday database for Germany including all Federal states, Switzerland, France etc.
  • Program simulation on clock display
  • Graphic program simulation with 12 month overview for all channels on PC
  • 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
  • Optional production of own city list (favourites) and a table with own astronomical times on PC
  • Fixed ON-OFF switching times can be programmed (e.g. night time interruption)
  • Simulation of astronomical switching times (calculated astronomical times and programmed ON/OFF switching times) for the whole year
  • various astronomical setting options (evening ON - mornings OFF or evenings OFF - mornings ON, astronomical pulse)
  • Switching preselection
  • Permanent switching ON/OFF
  • Count-down timer
  • Integrated operating hour counter
  • Reset option
  • Service function for monitoring maintenance intervals
  • Holiday program
  • 2 random programs
  • Display back light (can be turned off)
  • PIN coding

Technical data

Operating voltage 110 – 240 V AC
Frequency 50 – 60 Hz
Width 4 modules
Installation type DIN rail
Type of contact Two-way switch
Switching output Phase-independent
Opening width < 3 mm
Program Yearly program, Astronomical program
Program functions ON-OFF, Pulse, Cycle
Number of channels 4
External inputs 4
Number of memory locations 800
Power reserve 8 years
Switching capacity at 250 V AC, cos φ = 1 16 A
Switching capacity channels 1+3 10 A
Switching capacity at 250 V AC, cos φ = 0,6 10 A
Incandescent/halogen lamp load 230 V 2300 W
Incandescent/halogen lamp load 120 V 1150 W
Energy saving lamps 230 V 37 x 7 W, 30 x 11 W, 26 x 15 W, 26 x 20 W, 11 x 23 W
Energy saving lamps 120 V 18 x 7 W, 15 x 11 W, 13 x 15 W, 13 x 20 W, 11 x 23 W
LED lamp < 2 W 50 W
LED lamp 2-8 W 180 W
LED lamp > 8 W 200 W
Switching capacity min. ca. 10 mA
Shortest switching times 1 s
Time accuracy at 25 °C ≤ ± 0.5 s/day (quartz)
Time basis Quartz
Stand-by consumption ~0,5 W
Capacity loss max. 4,8 W
Memory card supplied
Type of connection DuoFix spring terminals
Externe Antenne anschließbar
Keyboards 4 touch buttons, 4 buttons for manual switching
Housing and insulation material High-temperature resistant, self-extinguishing thermoplastic
Type of protection IP 20
Protection class II according to EN 60 730-1
Spannung 110-240 V AC
Ambient temperature -30 °C … +45 °C

Connection example

TR 644 top2

Scale drawings

TR 644 top2


Article number Data sheet Documents basket
Wall mounting kit 70 mm - Terminal box cover plate for assembly, sealable

Wall mounting kit 70 mm

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 PDF
Tender texts DOC
Software ZIP
TR 644 top2 - Digital time switch with yearly and astronomical time program

TR 644 top2

Article number 6440100
Data sheet
Documents basket