TRB Series - Delay On Break Timer

Littelfuse Time Delay Relays
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The TRB Series combines an isolated, 10A electromechanical relay output with analog timing circuitry. False trigger of the TRB 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 TRB’s industry standard 8- or 11-pin plug-in base wiring.

Operation (Delay-on-Break)
Input voltage must be applied before and during timing. Upon closure of the initiate switch, the output relay energizes. The time delay begins when the initiate switch is opened (trailing edge triggered). The output remains energized during timing. At the end of the time delay, the output de-energizes. The output will energize if the initiate switch is closed when input voltage is applied.
Reset: Reclosing the initiate switch during timing resets the time delay. 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
TRB120A2Y30120VACIsolated SPDT-30° to 85°C (-22°F to 185°F)1 - 30s onboard adjustableNo
TRB120A3X600120VACIsolated SPDT-30° to 85°C (-22°F to 185°F)7 - 600s lock shaft adjustableNo
TRB120A4Y120120VACIsolated DPDT-30° to 85°C (-22°F to 185°F)2 - 120s onboard adjustableNo
TRB24D10Y1024VDC / 28VDCIsolated DPDT-30° to 85°C (-22°F to 185°F)10s fixedNo