MDB-501Z 3 Phase Motor Protection Relay

MDB-501Z 3 Phase Motor Protection Relay is a relay used for motor protection. It can monitor the status of the motor, such as current, voltage, temperature, etc., and automatically cut off the power to protect the motor from damage when a fault occurs or the set limit is exceeded.

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Features of 3 Phase Motor Protection Relay

  • Earth fault (should couple with ZCT)
  • RS-485 communication port
  • DC4-20 mA analog output
  • Separated output contacts,two for trip,one for alarm
  • 4 LEDs for status indication
  • Fault recording with last 3 faults
  • Protective Functions
    — Short-circuit — Locked-rotor — Overcurrent — Undercurrent
    — Phase loss — Phase unbalance — Overvoltage — Undervoltage
    — Ground fault

Application of 3 Phase Motor Protection Relay

  • motor system
  • — Pumps — Fans — Refrigeration Units — Blowers
    — Motors — Compressors — Lifts,Elevators
    — Cranes — Mining excavators and conveyors

Specification of 3 Phase Motor Protection Relay

Model MDB-501Z
Structure Integrative
Power supply AC220V,AC380V,50/60Hz
current Range 0.3-16A,3-160A,100-999A

*For 10-999A type,the relay should couple with external CT and set the CT ratio*

Measurement Error 1%
Time-current characteristic Definite & Inverse selectable
Reset mode Manual/Auto/Power cycle
RS-485 Protocol Modbus RTU
Output type Trip:1 NO+NC, Alarm: 1NO
Power consumption ≤ 5VA
Weight 500g
contact capacity 5A 250VAC,3A 380VAC
Dimension(L*W*D) 90*70*106.5mm

DIN Rail & Screw Fixing