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Tariff time switch TR 688 top2 SML

The TR 688 top2 SML digital time switch from Theben with 2 SML-control channels for EDL 21 meters. Programming and program transmission are easy using OBELISK top2 software.


  • Order No. 6880104
  • Digital time switch with yearly program
  • 2 SML-control channels for 21 EDL meters (channel 1: Direction of axis of reference, channel 2: Direction of supply), RJ10 socket for optical interface (SML)
  • 2 control channels with 2 relay outputs, changeover contacts 2 x 8 (3) A/250 V~
  • High time accuracy typical ? ± 0.25 s/day
  • Interface for OBELISK top2 memory card
  • PC-programming with OBELISK top2 software
  • Transfer of programs via OBELISK top2 memory card
  • Text in display
    • preset date and time
    • fully operable without mains connection
  • 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
  • Automatic summer/winter time changeover
    • Can be deactivated
    • Date rule options are already stored for Europe
    • Own date rule options or changeover around set dates are available
  • With EEPROM memory provides reliable operating data capture even with loss of power
  • 5 program memories each with 200 memory locations
  • 10 years power reserve

Technical data

TR 688 top2 SML 
Operating voltage230V~, -15%, +10%
Frequency50 – 60 Hz
InterfaceSML-interface (RJ10) for 21 EDL meters
Installation typeFront panel installation/wall installation
Type of contact2 Changeover contacts
Width3 modules
Switching outputphase-independent
Opening width< 3 mm
Programyearly program
Program functionsON-OFF
Number of channels2
Number of memory locations200
Power reserve10 years
Switching capacity at 250 V AC, cos φ = 12 x 8 A
Switching capacity at 250 V AC, cos φ = 0,62 x 3 A
Shortest switching times1 min
Time accuracytypical ± 0,25 s/day at 23°
Time basisQuarz
Memory card suppliedno
Type of connectionDuoFix spring terminals
Keyboards4 touch buttons
Housing and insulation materialHigh-temperature resistant, self-extinguishing thermoplastic
Type of protectionIP 20 as per EN 60529
Protection classII as per EN 60730-1
Ambient temperature-10 °C … +55 °C

Connection Example



Operating instructionsPDF acrobat_2
SoftwareZIP zip_netto

Scale drawings


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