Littelfuse HRDR121A4R, HRDR Series, 12VDC, Repeat Cycle Time Delay Relay SPDT (1 Form C) 1 Sec ~ 100 Sec Delay 30A @ 125/240VAC Chassis Mount
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The HRDR Series combines an electromechanical relay and microcontroller timing circuitry. It offers 12 to 230V operation in five ranges and factory fixed, onboard or externally adjustable time delays with a repeat accuracy of ±0.5%. The high switching capacity of the output contacts allow for direct control of heavy loads like compressors, pumps, motors, heaters and lighting. A bypass/reset switch option allows operator to interrupt normal recycling sequence and energize output relay. An excellent choice for OEM applications.
Operation (Recycling with Reset Switch)
Upon application of input voltage, the ON time T1 begins and output relay energizes. At the end of the ON time, the output relay de-energizes and the OFF time T2 begins. At the end of the OFF time, the output relay energizes and the cycle repeats as long as input voltage is applied. Some recycling timers have the OFF time as the first delay.
Reset: Removing input voltage resets output and time delays, and returns sequence to the first delay.
Bypass/Reset Switch: Closing the normally open bypass/reset switch energizes the output relay and resets the time delays. Opening the switch restarts recycling operation with the first delay.
Pre-order 6-8 Weeks
Specifications
| Time Delay | |
| Range | 100ms - 1000m in 6 adjustable ranges or fixed |
| Repeat Accuracy | ±0.5% or 20ms, whichever is greater |
| Tolerance (Factory Calibration) | ±5% |
| Reset Time | ≤ 150ms |
| Time Delay vs Temp. & Voltage | ≤ ±2% |
| Input | |
| Voltage | 12 or 24VDC; 24, 120, or 230VAC |
| Tolerance |
12VDC & 24VDC -15% - 20% 24 to 230VAC -20% - 10% |
| AC Line Frequency | 50/60 Hz |
| Power Consumption | AC ≤ 4VA; DC ≤ 2W |
| Output | |
| Type | Electromechanical relay |
| Form | SPDT, non-isolated |
| Ratings | SPDT-NO SPDT-NC |
| General Purpose | 125/240VAC 30A 15A |
| Resistive |
125/240VAC 30A 15A 28VDC 20A 10A |
| Motor Load |
125VAC 1 hp* 1/4 hp** 240VAC 2 hp** 1 hp** |
| Life |
Mechanical - 1 x 10⁶ Electrical - 1 x 10⁵, *3 x 10⁴, **6,000 |
| Protection | |
| Surge | IEEE C62.41-1991 Level A |
| Circuitry | Encapsulated |
| Dielectric Breakdown | ≥ 2000V RMS terminals to mounting surface |
| Insulation Resistance | ≥ 100 MΩ |
| Polarity | DC units are reverse polarity protected |
| Mechanical | |
| Mounting | Surface mount with one #10 (M5 x 0.8) screw |
| Dimensions |
H 76.7 mm (3”) W 51.3 mm (2”) D 38.1 mm (1.5”) |
| 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 | ≅ 3.9 oz (111 g) |