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    • HLMUDNAAN-R
  • Littlefuse SSAC HLMUDNAAN-R Voltage Monitor Relays
  • Littlefuse SSAC HLMUDNAAN-R Voltage Monitor Relays

    HLMUDNAAN-R

    SSAC / Littelfuse

    Please submit an RFQ or call 800-526-5376.

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    Product Description

    Description: Monitors • Voltage Monitor Relays • Input Voltage : 200 to 480 VAC • Restart Function; No restart delay • Mounting ; Surface Mount • Contact Configuration ; 2C DPDT • Votlage Unbalance; Adjust. 2-10% • Trip Delay; Adjust. 1-30s • Restart Delay; None

          Product Information       Resources
    ManufacturerSSAC - Littelfuse
    Product Category Monitors
    Product Sub Category Voltage Monitor Relays
    SeriesHLMU Series
     
      Download Datasheet
          Specifications
    Product Attribute
    Attribute Value
    Input Voltage 200 to 480 VAC
    Restart FunctionNo restart delay
    Mounting Surface Mount
    Contact Configuration 2C DPDT
    Votlage UnbalanceAdjust. 2-10%
    Trip DelayAdjust. 1-30s
    Restart DelayNone
          Series Features
    Voltage Monitors HLMU Series
    Series Description: The HLMU Series is a universal voltage, encapsulated, 3-phase voltage monitor. It continuously measures the voltage of each of the three phases with microcontroller accuracy and compares the value to preset trip points. It separately senses phase reversal and loss; over, under and unbalanced voltages; and over or under frequency. Protection is assured during periods of large average voltage fluctuations, or when regenerated voltages are present. The unit trips within 200ms when phase loss is detected. Adjustable time delays are included to prevent nuisance tripping and short cycling of sensitive equipment. The isolated, 10A, DPDT relay contacts trip when a phase voltage exceeds the trip limits for the trip delay. Nominal line voltage, voltage unbalance, and time delays are knob adjustable. The phase loss setpoint and the acceptable frequency range are fixed. Both delta and wye systems can be monitored; no connection to neutral is required .
    Operation: Upon application of line voltage, the output is de-energized and the restart delay begins. If all the three-phase voltages are within the acceptable range, the output energizes at the end of the restart delay. The microcontroller circuitry automatically senses the voltage range, and selects the correct operating frequency (50 or 60Hz). The over and under voltage trip points are set at ± 10% of the adjusted line voltage. When the measured value of any phase voltage exceeds the acceptable range limits (lower or upper) the trip delay begins. At the end of the trip delay the output relay de-energizes. If the phase voltage returns to an acceptable value before the trip delay expires, the trip delay is reset and the output remains energized. Under, over, and unbalanced voltages plus over or under frequency must be sensed for the complete trip delay before the unit trips. The unit trips in 200ms when phase loss or reversal are sensed. The unit will not energize if a fault is sensed as the line voltage is applied.
    Reset: Reset is automatic upon correction of the voltage or frequency fault or phase sequence.
    Restart Delay Options
    L = Lockout or minimum OFF time. The restart delay begins when the output trips. The unit cannot be re-energized until the restart delay is complete. This provides a minimum off time or lockout time to allow equipment sensitive to short cycling,
    • Protects against phase loss & reversal; over, under & unbalanced voltages; & over & under frequency
    • Encapsulated circuitry
    • Isolated, 10A, DPDT output contacts
    • LED indicates relay status, faults, & time delays
    • Universal line voltage 200 to 480VAC in one unit
    • Compact design
    • Finger-safe terminal blocks, up to 12 AWG
    • ASME A17.1 rule 210.6
    • NEMA MG1 14:30, 14:35
    • IEEE C62.41-1991 Level B

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