TRB120A3X600 - TRB Series

Series: TRB Questions? Contact Littelfuse Support
Littelfuse Time Delay Relays
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.

Property (Mouseover for details) Value
Input Voltage (V) 120VAC
Input Tolerance (%) -20% - 10%
Input AC Line Frequency (Hz) 50/60Hz
Output Type Electromechanical relay
Output Form Isolated SPDT
Output Load Rating (VA) 10A resistive @ 120/240VAC and 28VDC; 1/3hp @ 120/240VAC
Time Delay Type Analog circuitry
Time Delay Range 7 - 600s lock shaft adjustable
Time Delay Tolerance (%) ±20%
Recycle Time (ms) ≤250ms
Reset Time (ms) ≤75ms
Initiate Time (ms) ≤70ms
Repeat Accuracy (%) ±2% or 20ms whichever is greater
Setting Accuracy ±20%
Setpoint vs Ambient Temperature and Operating Voltage (%) ≤ ±10%
Insulation Resistance ≥100 MΩ
Isolation Voltage (V) ≥1500V RMS input to output
Life Mechanical - 1 x 107; Electrical - 1 x 106
Power Consumption ≤3.25W
Termination Type Octal 8-pin
Mounting Method Plug-in socket
Operating Temperature -20° to 65°C (-4°F to 149°F)
Storage Temperature (F/C) -30° to 85°C (-22°F to 185°F)
Dimensions 3.62 x 2.39 x 1.78 in. (91.6 x 60.7 x 45.2mm)
Weight (lbs/g) ≅6.0oz (170g)
Sample capable No