Littelfuse KRDR321B4 is a highly reliable and durable voltage relay. It has an output load rating of 10 A resistive at 125 V ac, 5 A resistive at 230 V ac and 28 V dc, and 1/4 hp at 125 V ac. It features 0.25 in. male quick connect terminals for easy termination. With a humidity tolerance of 95% non-condensing, it ensures performance in various environments. The relay has a repeat accuracy of ±0.5% or 20 ms, offering precise control. It is encapsulated and has a low power consumption of ≤2 W. The reset time is ≤150 ms, delivering efficient operation. With a long electrical life of 1 x 10⁵ and mechanical life of 1 x 10⁷, it provides extended service. The polarity protection feature makes it ideal for DC applications. It has input DC ripple ≤10% and a maximum output voltage of 250 V.