Littelfuse KRDR321A4 is a compact, encapsulated voltage sensing relay with male quick connect terminals. It has a 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. With a repeat accuracy of ±0.5% or 20 ms, it offers reliable performance. The relay is humidity-resistant, operates in an input tolerance range of -15% to 20%, and has a maximum output voltage of 250 V. The reset time is ≤150 ms, while the life expectancy is 1 x 10⁵ electrical cycles and 1 x 10⁷ mechanical cycles. This reverse polarity protected relay consumes ≤2 W power.