Description
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.
| Property | Value |
|---|---|
|
Input Voltage (V)
|
120 V ac
|
|
Output Form
|
SPDT
|
|
Time Delay Range (s)
|
1 - 100 m onboard adjustable
|
|
Dimensions
|
2 H x 2 W in. (50.8 x 50.8 mm)
|
|
Circuitry
|
Encapsulated
|
|
Humidity
|
95% relative : non-condensing
|
|
Initiate Time
|
≤40
|
|
Input AC Line Frequency (Hz)
|
50/60
|
|
Input Tolerance (%)
|
-20% - 10%
|
|
Insulation Resistance (Ω)
|
≥100
|
|
Isolation Voltage
|
≥1500 Vrms input to output
|
|
Life
|
Electrical: 1 x 10⁵; Mechanical: 1 x 10⁷
|
|
Mounting Method
|
Surface mount with 1 #10 (M5 x 0.8) screw
|
|
Operating Temperature Max (°C)
|
60
|
|
Operating Temperature Maximum Fahrenheit
|
140
|
|
Operating Temperature Minimum Celsius
|
-40
|
|
Operating Temperature Minimum Fahrenheit
|
-40
|
|
Output Load Rating (VA)
|
10 A resistive @ 125 V ac; 5 A resistive @ 230 V ac and 28 V dc; 1/4 hp @ 125 V ac
|
|
Output Type
|
Isolated relay contacts
|
|
Power Consumption
|
≤2 VA
|
|
Repeat Accuracy (%)
|
±0.5% or 20 ms whichever is greater
|
|
Reset Time (ms)
|
≤150
|
|
Setpoint vs. Ambient Temperature and Operating Voltage
|
≤±5%
|
|
Storage Temperature Maximum Celsius
|
85
|
|
Storage Temperature Maximum Fahrenheit
|
185
|
|
Storage Temperature Minimum Celsius
|
-40
|
|
Storage Temperature Minimum Fahrenheit
|
-40
|
|
Switching Voltage Maximum (V)
|
250
|
|
Termination Type
|
0.25 in. (6.35 mm) male quick connect terminals
|
|
Time Delay Tolerance (%)
|
±5%
|
|
Time Delay Type
|
Microcontroller with watchdog circuitry
|
