Littelfuse KRDM121 is an encapsulated thermal protective device with a maximum switching voltage of 250V. It has a load rating of 10A resistive @ 125 V ac, 5A resistive @ 230 V ac and 28 V dc, and 1/4 hp @125V ac @ 40°C. The termination type is 0.25 in. (6.35 mm) male quick connect terminals. It has an input tolerance of -15% to 20%, humidity is 95% relative non-condensing, and insulation resistance is ≥100. It has a repeat accuracy of ±0.5% or 20ms, and a power consumption of ≤2W. It has a time delay tolerance of ±5% and a recycle time ≤150 ms. The device is reverse polarity protected for DC units and has an input DC ripple of ≤10%. Its electrical life is 1 x 10⁵ and mechanical life is 1 x 10⁷.