Littelfuse KRPSA21RE is a compact and reliable power relay. It has a load rating of 10 A resistive @ 125 V ac, 5 A resistive @ 230 V ac and 28 V dc, and 1/4 hp @ 125 V ac. It features 0.25 in. (6.35 mm) male quick connect terminals for easy installation. The relay operates at an input AC line frequency of 50/60 Hz and has a tolerance of -20% to 10%. It is encapsulated and has a power consumption of ≤2 VA for AC and ≤2 W for DC. The relay has a time delay tolerance of ±2%, a reset time of ≤150 ms, and a time delay type of microcontroller. It has a long electrical life of 1 x 10⁵ and a mechanical life of 1 x 10⁷. The relay has an undervoltage trip voltage of ±2% and is reverse polarity protected for DC units. It has an input DC ripple of ≤10% and a maximum switching voltage of 250 V.