The KRDB Series is a compact time delay relay measuring only 2 in. (50.8 mm) square. Its microcontroller timing circuit provides excellent repeat accuracy and stability. Encapsulation protects against shock, vibration, and humidity. The KRDB Series is a cost effective approach for OEM applications that require small size, isolation, reliability, and long life. Operation (Delay-on-Break) Input voltage must be applied before and during timing. Upon closure of the initiate switch, the output relay energizes. The time delay begins when the initiate switch is opened. The output remains energized during timing. At the end of the time delay, the output de-energizes. The output will energize if the initiate switch is closed when input voltage is applied. Reset: Reclosing the initiate switch during timing resets the time delay. Loss of input voltage resets the time delay and output. Specifications Time Delay Type Microcontroller with watchdog circuitry Range 0.1s - 1000m in 6 adjustable ranges or fixed Repeat Accuracy ±0.5% or 20ms, whichever is greater Tolerance (Factory Calibration) ≤ ± 5% Reset Time ≤ 150ms Initiate Time ≤ 40ms; Time Delay vs Temp. & Voltage ≤ ±5% Input Voltage 12, 24 or 110VDC; 24, 120 or 230VAC Tolerance 12VDC & 24VDC/AC -15% - +20%110VDC, 120 or 230VAC -20% - +10% AC Line Frequency/DC Ripple 50/60 Hz / ≤ 10% Power Consumption AC ≤ 2VA; DC ≤ 2W Output Type Isolated relay contacts Form SPDT Rating (at 40°C) 10A resistive @ 125VAC;5A resistive @ 230VAC & 28VDC;1/4 hp @ 125VAC Max. Switching Voltage 250VAC Life (Operations) Mechanical - 1 x 10⁷ ; Electrical - 1 x 10⁵ Protection Polarity DC units are reverse polarity protected Circuitry Encapsulated Isolation Voltage ≥ 1500V RMS input to output Insulation Resistance ≥ 100 MΩ Mechanical Mounting Surface mount with one #10 (M5 x 0.8) screw Dimensions H 50.8 mm (2”)W 50.8 mm (2”)D 30.7 mm (1.21”) Termination 0.25 in. (6.35 mm) male quick connect terminals Environmental Operating/Storage Temperature -40° to 60°C / -40° to 85°C Humidity 95% relative, non-condensing Weight ≅ 2.6 oz (74 g)
