KRD92115MA - KRD9 Series

Series: KRD9 Questions? Contact Littelfuse Support
Littelfuse Retriggerable Single Shot
The KRD9 Series microcontroller timing circuit provides excellent repeat accuracy and stability. Cost effective approach for OEM applications that require small size, isolation, reliability, and long life.

Operation (Retriggerable Single Shot)
Function Type A (Output Initially De-energized): Input voltage must be applied prior to and during timing. When the initiate switch is closed, (momentary or maintained) the output energizes and the time delay starts. On completion of the delay, the output de-energizes. The unit will time out if S1 remains in the open or closed position for the full time delay. Re-closing the initiate switch resets the time delay and restarts timing; the output remains energized. The output will not energize if the initiate switch is closed when input voltage is applied.

Function Type B (Output Initially Energized): Upon application of input voltage, the output energizes and the time delay starts. At the end of the time delay, the load de-energizes. The unit will time out if S1 remains in the open or closed position for the full time delay. Closing (re-closing) the initiate switch resets the time delay and restarts timing; the output remains energized.
Reset: The time delay and the output are reset when input voltage is removed.

Property (Mouseover for details) Value
Input Voltage (V) 24VAC/DC
Input Tolerance (%) -15% - 20%
Input AC Line Frequency (Hz) 50/60Hz
Input DC Ripple (%) ≤10%
Output Type Isolated relay contacts
Output Form SPDT
Output Load Rating (VA) 10A resistive @ 125VAC; 5A resistive @ 230VAC and 28VDC; 1/4hp @ 125VAC
Maximum Output Voltage (V) 250VAC
Time Delay Type Microcontroller based with watchdog circuitry
Time Delay Range 15m fixed
Time Delay Tolerance (%) ≤±5%
Reset Time (ms) ≤150ms
Initiate Time (ms) ≤40ms; ≤750 operations per minute
Repeat Accuracy (%) ±0.5% or 20ms whichever is greater
Setpoint vs Ambient Temperature and Operating Voltage (%) ≤ ±5%
Insulation Resistance ≥100 MΩ
Isolation Voltage (V) ≥1500V RMS input to output
Circuitry Encapsulated
Polarity DC units are reverse polarity protected
Life Mechanical - 1 x 107; Electrical - 1 x 105
Power Consumption AC: ≤2VA; DC: ≤2W
Termination Type 0.25 in. (6.35mm) male quick connect terminals
Mounting Method Surface mount with one #10 (M5 x 0.8) screw
Operating Temperature -40° to 60°C (-40°F to 140°F)
Storage Temperature (F/C) -40° to 85°C (-40°F to 185°F)
Humidity 95% relative non-condensing
Dimensions 2.00 x 2.00 x 1.21 in. (50.8 x 50.8 x 30.7mm)
Weight (lbs/g) ≅2.6oz (74g)
Sample capable No