TSDR Series - Recycling Timer

Littelfuse Recycle Time Delay Relays
The TSDR Series is an ON/OFF or OFF/ON recycling timing module designed to control metering pumps, chemical valves, flash lamps, or use in energy saving or duty cycling applications. It may be ordered with both time delays factory fixed, or one delay fixed and the other delay external or onboard adjustable. The TSDR Series is designed for more demanding commercial and industrial applications where small size and accurate performance are required. The factory calibration for fixed time delays is < ±5%. The repeat accuracy, under stable conditions, is 0.5% of the time delay. The TSDR Series is rated to operate over an extended temperature range. Time delays of 0.1 seconds to 1000 minutes are available. The output is rated 1A steady and 10A inrush. The modules are totally solid state and encapsulated to protect the electronic circuitry.


Operation (Recycling - ON Time First)

Upon application of input voltage, the output energizes and the T1, ON time begins. At the end of the ON time, the output de-energizes and the T2, OFF time begins. At the end of the OFF time, the output energizes and the cycle repeats as long as input voltage is applied.
Reset: Removing input voltage resets the output and time delays, and returns the sequence to the T1 ON time.


Operation (Recycling - OFF Time First)

Upon application of input voltage, the T2 OFF time begins. At the end of the OFF time, the T1 ON time begins and the load energizes. At the end of the T1, T2 begins and the load de-energizes. This cycle repeats until input voltage is removed.
Reset: Removing input voltage resets the output and the sequence to T2 OFF time.

Access specifications, certifications, check availability and order parts below

Catalog #Input
Voltage (V)
Storage Temperature (F/C)Time Delay RangeSample capableCompare
TSDR215SB18M24VAC-40° to 85°C (-40°F to 185°F)ON: 5s fixed; OFF time first: 18m fixedNo
TSDR415SB18M120VAC-40° to 85°C (-40°F to 185°F)ON: 5s fixed; OFF time first: 18m fixedNo
TSDR4412SA1120VAC-40° to 85°C (-40°F to 185°F)ON time first: 12s fixed; OFF: 1 - 100s externally adjustableNo
TSDR442MA2120VAC-40° to 85°C (-40°F to 185°F)ON time first: 2m fixed; OFF: 10 - 1 000s externally adjustableNo
TSDR4430SA2120VAC-40° to 85°C (-40°F to 185°F)ON time first: 30s fixed; OFF: 10 - 1 000s externally adjustableNo
TSDR610.2SA0.2S230VAC-40° to 85°C (-40°F to 185°F)ON time first: 0.2s fixed; OFF: 0.2s fixedNo
TSDR6110SA30S230VAC-40° to 85°C (-40°F to 185°F)ON time first: 10s fixed; OFF: 30s fixedNo
TSDR6412SA1230VAC-40° to 85°C (-40°F to 185°F)ON time first: 12s fixed; OFF: 1 - 100s externally adjustableNo