TDR4A23 - TDR Series

Series: TDR
Questions? Contact Littelfuse Support
External overview image
Roll Over to Zoom
Disclaimer Notice

Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

The TDR Series of time-delay relays are comprised of digital circuitry and an isolated, 10A relay output. The on and off delays are selected by means of two, ten position binary switches, which allow the setting of the desired delay to be precise every time.


Operation (Recycling - ON Time First)
Upon application of input voltage, the green LED glows, the output relay is energized, the red LED glows, and the T1 ON time begins. At the end of the ON time, the output deenergizes, the red LED turns OFF and the T2, OFF time begins. At the end of the OFF time, the output relay energizes and the cycle repeats as long as input voltage is applied.
Reset: Removing input voltage resets the output and time delays, and returns the sequence to the first delay.


Operation (Recycling - OFF Time First)
Upon application of input voltage, the green LED glows, the T1 OFF time begins, the load is OFF. At the end of the OFF time, the T2 ON time begins, the load energizes, and the red LED glows. At the end of the ON time the load de-energizes and the red LED turns OFF. The cycle repeats until input voltage is removed.
Reset: Removing input voltage resets the output and the sequence to the OFF time.

Check Stock Order Samples

Product Literature

For Technical Questions

Call +1 800-832-3873 or email us at relays@littelfuse.com 

Property (Mouseover for details) Value
Input Voltage (V) 120 V ac
Input Tolerance (%) -20% - 10%
Input AC Line Frequency (Hz) 50/60
Output Type Electromechanical relay
Output Form DPDT
Output Load Rating (VA) 10 A resistive @ 120/240 V ac and 30 V dc; 1/3 hp @ 230 V ac
Time Delay Type Microcontroller
Time Delay Range ON time first: 1 - 1023 s in 1 s increments; OFF: 10 - 10230 s in 10 s increments
Recycle Time (ms) ≤500
Reset Time (ms) ≤150
Repeat Accuracy (%) ±0.1% or 20 ms whichever is greater
Setting Accuracy ≤±2% or 50 ms whichever is greater
Setpoint vs Ambient Temperature and Operating Voltage (%) ≤±2%
Indication Input Green: LED on when input voltage is applied; Relay Red: LED ON when output relay energizes
Undervoltage Trip Voltage 023 s in 1 s increments; OFF: 10 - 10
Insulation Resistance ≥100
Life Electrical: 1 x 10⁵; Mechanical: 1 x 10⁷
Power Consumption ≤2 VA
Termination Type Octal 8-pin plug-in
Mounting Method Plug-in socket
Operating Temperature -20° to 60°C (-4° to 140°F)
Storage Temperature (F/C) -30° to 85°C (-22° to 185°F)
Dimensions 3.2 H x 2.4 W in. (81.3 x 60.7 mm)
Weight (lbs/g) 0 Kg
Dimensions 3.2 H x 2.4 W in. (81.3 x 60.7 mm)

To request product environmental information, please complete the Product Environmental Information Request Form.