Littelfuse TDR4A23 is a versatile octal 8-pin plug-in time delay relay. It has an output load rating of 10 A resistive @ 120/240 V ac and 30 V dc, with a termination type of octal 8-pin plug-in. The input AC line frequency is 50/60 Hz, with an input tolerance of -20% to 10%. The repeat accuracy is ±0.1% or 20 ms, whichever is greater. It has an insulation resistance of ≥100 and a power consumption of ≤2 VA. The reset time is ≤150 ms, and the time delay type is microcontroller. It has a long life expectancy, with electrical life rated at 1 x 10⁵ and mechanical life at 1 x 10⁷. The undervoltage trip voltage is adjustable from 0 to 23 s in 1 s increments, and the setting accuracy is ≤±2% or 50 ms, whichever is greater. It features indication LED lights, with a green LED indicating when input voltage is applied and a red LED indicating when the output relay energizes.