Littelfuse KRDI420, KRDI Series, 120VAC, Interval Time Delay Relay SPDT (1 Form C) 0.1 Sec ~ 10 Sec Delay 10A @ 125VAC Chassis Mount
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The KRDI Series is a compact time-delay relay measuring only 2 in. (50.8 mm) square. Its solid-state timing circuit provides excellent repeat accuracy and stability. Encapsulation protects against shock, vibration, and humidity. The KRDI Series is a cost effective approach for OEM applications that require small size, isolation, reliability, and long life.
Operation (Interval)
Upon application of input voltage, the time delay begins. The output relay energizes during the time delay. At the end of the time delay, the output de-energizes and remains de-energized until input voltage is removed.
Reset: Removing input voltage resets the time delay and the output.
Pre-order 6-8 Weeks
Specifications
| Time Delay | |
| Range | 0.1s - 100m in 5 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 | -20° to 60°C / -40° to 85°C |
| Humidity | 95% relative, non-condensing |
| Weight | ≅ 2.6 oz (74 g) |