TRS Series - Single Shot Timer

Littelfuse Single Shot Relays
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The TRS Series combines an isolated, 10A electromechanical, relay output with analog timing circuitry. False trigger of the TRS by a transient is unlikely because of the complete isolation of the circuit from the line prior to initiation. The initiate contact is common to one side of the line and may be utilized to operate other loads. Installation is easy due to the TRS’s industry standard 8 or 11-pin plug-in base wiring.

Operation (Single Shot)
Input voltage must be applied to the input before and during timing. Upon momentary or maintained closure of the initiate switch (leading edge triggered), 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. Applying input voltage with the initiate switch closed will energize the load and begin the time delay.
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
TRS120A2X30120VACIsolated SPDT-40° to 85°C (-40°F to 185°F)1 - 30s knob adjustableNo
TRS120A2X300120VACIsolated SPDT-40° to 85°C (-40°F to 185°F)7 - 300s knob adjustableNo
TRS120A2Y10120VACIsolated SPDT-40° to 85°C (-40°F to 185°F)0.1 - 10s knob adjustableNo
TRS120A2Y30120VACIsolated SPDT-40° to 85°C (-40°F to 185°F)1 - 30s knob adjustableNo
TRS24D7Z1024VDC / 28VDCIsolated SPDT-40° to 85°C (-40°F to 185°F)0.1 - 10s externally adjustableNo