Littelfuse TRDU120A1 is a 10 A resistive load controller with an octal 8-pin plug-in termination. It operates at 120/240 V ac and 28 V dc, with a 1/3 hp rating at 120/240 V ac. The input AC line frequency is 50/60 Hz, with a tolerance of -20% to 10%. It has a repeat accuracy of ±0.1% or 20 ms, insulation resistance of ≥100, and power consumption of ≤3 W. The reset time is ≤50 ms and the initiate time is 75 ms. It offers a setting accuracy of ±1% or 50 ms, and indication is provided by two LEDs for input voltage and output relay status. Adjustments can be made using the multiplier feature and five time delay options are available with twenty-one single or dual functions. It has a life of 1 x 10⁶ electrical cycles and 1 x 10⁷ mechanical cycles.