THDS Series - Single Shot Timer

Littelfuse Single Shot Relays
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The THDS Series combines accurate timing circuitry with high power solid-state switching. It can switch motors, lamps, and heaters directly without a contactor. You can reduce labor, component cost, and increase reliability with these small, easy-to-use THDS Series timers.

Operation (Single Shot)
Input voltage must be applied before and during timing. Upon momentary or maintained closure of the initiate switch, the output energizes for a measured interval of time. At the end of the delay, the output de-energizes. Opening or reclosing the initiate switch during timing has no affect on the time delay. The output energizes if the initiate switch is closed when input voltage is applied.
Reset: Reset occurs when the time delay is complete and the initiate switch is opened. Loss of input voltage resets the time delay and output.

Access specifications, certifications, check availability and order parts below

Catalog #Input
Voltage (V)
Storage Temperature (F/C)Time Delay RangeSample CapableCompare
THDS410.25SA120VACNO closed during timing-40° to 85°C (-40°F to 185°F)0.25s fixedNo
THDS431C120VACNO closed during timing-40° t° 85°C (-40°F t° 185°F)1 - 100s onboard adjustableNo
THDS610.25SA230VACNO closed during timing-40° to 85°C (-40°F to 185°F)0.25s fixedNo