TBD Series Off-Delay DIP Switch Time Delay Relay

The TBD Series Off-Delay DIP Switch Time Delay Relay from the ATC Diversified Electronics division of Marsh Bellofram is a family of rugged, high-reliability off-delay DIP switch time delay relays (TDRs), designed to equip industrial machinery, conveyor belts, exhaust fans, heating systems, lubricators, and pump and motor controls with timed sequence delay, soft-start delay or auto-start functions for added machinery and equipment protection. Supply voltage is continuously applied to the input. An external isolated switch between pins 5 and 6 controls the timer. When closed, the relay energizes. Opening the switch initiates the delay period. Upon completion of the delay period, the relay de-energizes. If the control switch recloses during the delay period, the relay remains energized and the timer resets to zero. NOTE: The TBD series is available in 8-pin SPDT and 11-pin DPDT configurations.



  • Off-delay time set with DIP switches
  • Available models from 0.1 seconds to 1,023 minutes
  • LED glows when relay is energized
  • High repeatability and accuracy


  • Industrial machinery and equipment
  • Conveyor belts
  • Exhaust fans
  • Heating systems
  • Lubricators
  • Pump and motor controls
  • Flashing light control
  • Engine auto start control