HRDR321A4R - HRDR Series

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Littelfuse Recycle Time Delay Relays
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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.

Property (Mouseover for details) Value
Input Voltage (V) 24VDC
Input Tolerance (%) -15% - 20%
Output Type Electromechanical relay
Output Form SPDT non-isolated
Output Load Rating (VA) General Purpose: SPDT-NO: 125/240VAC ≅ 30A; SPDT-NC≅15A; Resistive: SPDT-NO≅30A for 125/240VAC 20A for 28VDC; SPDT-NC≅15A for 125/240VAC 10A for 28VDC; Motor Load: SPDT-NO≅1 hp for 125VAC 2hp for 240VAC; SPDT-NC≅1/4hp for 125VAC 1hp for 240VAC
Time Delay Range ON time first: 1 - 100s onboard adjustable; OFF: 1 - 100m onboard adjustable
Time Delay Tolerance (%) ≤±5%
Reset Time (ms) ≤150ms
Repeat Accuracy (%) ±0.5% or 20ms whichever is greater
Setpoint vs Ambient Temperature and Operating Voltage (%) ≤ ±2%
Surge Protection IEEE C62.41-1991 Level A
Insulation Resistance ≥100 MΩ
Dielectric Breakdown ≥2000V RMS terminals to mounting surface
Circuitry Encapsulated
Polarity DC units are reverse polarity protected
Life Mechanical - 1 x 106; Electrical - 1 x 105 3 x 104 for 1hp 6 000 for 1/4hp 1hp and 2hp
Power Consumption ≤2W
Termination Type 0.25 in. (6.35mm) male quick connect terminals
Mounting Method Surface mount with one #10 (M5 x 0.8) screw
Operating Temperature -40° to 60°C (-40°F to 140°F)
Storage Temperature (F/C) -40° to 85°C (-40°F to 185°F)
Humidity 95% relative non-condensing
Dimensions 3.00 x 2.00 x 1.50 in. (76.7 x 51.3 x 38.1mm)
Weight (lbs/g) ≅3.9oz (111g)
Sample capable No