Littelfuse HRDM120, HRDM Series, 12VDC, On-Delay Time Delay Relay SPDT (1 Form C) 0.1 Sec ~ 10 Sec Delay 30A @ 125/240VAC Chassis Mount
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The HRDM Series combines an electromechanical relay output with microcontroller timing circuitry. It offers 12 to 230V operation in five ranges and factory fixed, onboard, or external adjustable time delays with a repeat accuracy of ±0.5%. The output contact rating allows for direct operation of heavy loads, such as compressors, pumps, blower motors, heaters, etc. This series is ideal for OEM applications where cost is a factor.
Operation (Delay-on-Make)
Upon application of input voltage, the time delay begins. The output is de-energized before and during the time delay. At the end of the time delay, the output relay energizes and remains energized until input voltage is removed.
Reset: Removing input voltage resets the time delay and output.
Specifications
| Time Delay | |
| Type | Microcontroller circuitry |
| Range | 0.1s - 100m in 5 adjustable ranges or fixed |
| Repeat Accuracy | ±0.5 % or 20ms, whichever is greater |
| Tolerance (Factory Calibration) | ±1%, ±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 | Non-isolated, SPDT |
| 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 | 3 x 2 x 1.5 in. (76.7 x 51.3 x 38.1mm) |
| 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) |