Littelfuse KRDS120, KRDS Series, 12VDC, One Shot Time Delay Relay SPDT (1 Form C) 0.1 Sec ~ 10 Sec Delay 10A @ 125VAC Chassis Mount
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The KRDS 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 KRDS Series is a cost effective approach for OEM applications that require small size, isolation, reliability, and long life.
Operation (Single Shot)
Input voltage must be applied before and during timing. Upon momentary or maintained closure of the initiate switch, the output relay energizes for a measured interval of time. At the end of the delay, the output de-energizes. Opening or reclosing the initiate switch during timing has no affect on the time delay. The output will energize if the initiate switch is closed when input voltage is applied.
Reset: Reset occurs when the time delay is complete and the initiate switch is opened. Loss of input voltage resets the time delay and output.
Pre-order 6-8 Weeks
Specifications
| Time Delay | |
| Range | 0.1s - 1000m in 6 adjustable ranges or fixed |
| Type | Microcontroller with watchdog circuitry |
| 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 |
| 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) |