SSAC’s Time Delay Relay TDR series – Product Feature Spotlight

SSAC’s TDR Series are switch settable time delay relays comprised of digital circuitry and isolated 10 amp double pole double throw relay outputs, with an octal plug-in base connection.  SSAC’s TDR Series has a voltage rating of 12, 24, or 110 volts DC, and 120 or 230 volts AC.


SSAC’s TDR series available at! The unit pictured here is item number #TDR4A23

This series of Timing relays by SSAC has a plus or minus 0.1 percent repeat accuracy and a plus or minus 2 percent setting accuracy.  The timinrange for the TDR relays range from 0.1 to 10,230 seconds in 3 ranges.

The on and off delays are selected by means of two ten position binary switches, which allow the setting of the desired delay to be precise every time.  The mode of operation for the TDR series is Recycling with ON Time First or Recycling with OFF Time First.

When the operation of the ON Time First begins, the green LED will illuminate upon application of the input voltage and the output relay will be energized.  The red LED will also illuminate, and the ON time begins. At the end of the ON time, the output de energizes, and the red LED turns OFF which begins the OFF time. At the end of the OFF time, the output relay energizes and the cycle repeats as long as the input voltage is applied.  To reset, remove the input voltage.  The output and time delays will reset and will return the sequence to the first delay.

With the operation of the OFF Time First, the green LED will light up and the OFF time will begin upon application of input voltage and the load is OFF.  At the end of the OFF time the ON time begins, and the load energizes with the red LED illuminated. At the end of the ON time, the load de energizes and the red LED turns OFF. The cycle repeats until input voltage is removed.

If you have any questions about SSAC’s Timing Relays TDR series,  contact our experts today!

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