Littelfuse KRDR121A1, KRDR Series, 12VDC, Repeat Cycle Time Delay Relay SPDT (1 Form C) 1 Sec ~ 100 Sec Delay 10A @ 125VAC Chassis Mount
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The KRDR 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 KRDR Series is a cost effective recycling timer for OEM applications that require small size, isolation, reliability, and long life.
Operation (Recycling - ON Time First)
Upon application of input voltage, the output relay energizes and the T2 ON time begins. At the end of the ON time, the output de-energizes and the T1 OFF time begins. At the end of the OFF time, the output relay energizes and the cycle repeats as long as input voltage is applied
Reset: Removing input voltage resets the output and the time delays, and returns the sequence to the ON time.
Operation (Recycling - OFF Time First)
Upon application of input voltage, the T1 OFF time begins. At the end of the OFF time, the T2 ON time begins and the load energizes. At the end of the ON time the load de-energizes, and the cycle repeats until input voltage is removed.
Reset: Removing input voltage resets the output and the sequence to the OFF time.
Pre-order 6-8 Weeks
Specifications
| Time Delay | |
| Range | 0.1s - 1000m in 6 adjustable ranges or fixed |
| Repeat Accuracy | ±0.5% or 20ms, whichever is greater |
| Tolerance (Factory Calibration) | ≤ ± 5% |
| Recycle Time | ≤ 150ms |
| 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) |