TDB12D - TDB/TDBH/TDBL Series

Littelfuse Time Delay Relays
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The TDB Series combines accurate digital circuitry with isolated, 10A, DPDT or SPDT contacts in an 8 or 11-pin plug-in package. The TDB Series features DIP switch selectable time delays ranging from 0.1-10,230 seconds in three ranges. The TDB Series is the product of choice for custom control panel and OEM designers.


Operation (Delay-on-Break)
Input voltage must be applied to the input before and during timing. Upon closure of the initiate switch, the output relay is energized. 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) 12VDC
Input Tolerance (%) -15% - 20%
Output Type Electromechanical relay
Output Form DPDT
Output Load Rating (VA) 10A resistive @ 120/240VAC and 28VDC; 1/3hp @ 120/240VAC
Time Delay Type Digital integrated circuitry
Time Delay Range 1 - 1 023s in 1s increments
Recycle Time (ms) ≤150ms
Reset Time (ms) ≤50ms
Initiate Time (ms) ≤60ms
Repeat Accuracy (%) ±0.1% or 20ms whichever is greater
Setting Accuracy ±2% or 50ms whichever is greater
Setpoint vs Ambient Temperature and Operating Voltage (%) ≤ ±5%
Indication LED indicates relay is energized
Isolation Voltage (V) ≥1500V RMS input to output
Polarity DC units are reverse polarity protected
Life Mechanical - 1 x 107; Electrical - 1 x 106
Power Consumption ≤3.25W
Termination Type 11-pin plug-in
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 3.20 x 2.40 x 1.80 in. (81.3 x 60.7 x 45.2mm)
Weight (lbs/g) ≅6.0oz (170g)
Sample capable No