Littelfuse KRDR421A4 is a versatile relay with 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 a 0.25 in. (6.35 mm) male quick connect terminal for easy installation. With a wide input AC line frequency range of 50/60 Hz and tolerance of -20% to 10%, it is suitable for various applications. Its encapsulated circuitry ensures durability and reliability. It consumes ≤2 VA of power and has a ≤±5% setpoint vs ambient temperature and operating voltage. The relay offers a repeat accuracy of ±0.5% or 20 ms (whichever is greater), ≤±5% time delay tolerance, and a reset time of ≤150 ms. Insulation resistance is ≥100Ω and it has a maximum output voltage of 250 V. The relay has a long electrical life of 1 x 10⁵ cycles and mechanical life of 1 x 10⁷ cycles. It operates in 95% relative humidity without condensation.