Digital Motor Protection Relay

Installation: Panel Mounting Type

Model: DSP-3SD




  • Over/Under current

  • Phase Loss

  • Reverse Phase

  • Locked Rotor

  • Current Unbalance


  • Password

  • Self-diagnostics

Main Features

  • Access restricted to authorized operator: Password

  • MCU based digital control : optimized protection

  • Compact size,Practical simple applicationn
    * Protection : Over/Under current, Phase loss, Reverse Phase, Locked rotor, Current Unbalance
    * Indication : 3 phase current

  • 3 phase load protection through 3 CT

  • To cover wide and precise current range for the protection
    *10 Type
    ▸ Definite T-I: 0.5A∼10A , 0.5A~6A with external CT
    ▸ Inverse T-I: 0.5A~6A/800% to “oc”
    *60 Type
    ▸ Definite T-I: 5A∼60A
    ▸ Inverse T-I: 5A~15A/800% to “oc”
    *Wide protection current range with external CT : 1A∼600A

  • Trip cause indication by number and/or characters : 4 digit window

  • Rotated indication for 3 phase current with 3 sec interval
    *1P(single phase) :L1-L3 current
    *3P(three phase) :L1-L2-L3

  • Convenient selection for 1P/3P in preset mode

  • Manual/Electrical/Auto Reset : easy selection in preset mode flexible application
    to meet various system

  • Stable operation under frequency variation from Inverter : 30Hz ∼ 400Hz

  • Self-diagnostic test by one touch of "SET" key

  • History, latest 8 trip events including self-diagnostic function


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