Protection Relay

MSR-HD Digital Motor Protection Relay with Voltage Metering

Advantages at a glance

Fully equipped, digital microprocessor based motor protection relay with 10 PT100 inputs. Separate alarm and trip relay inclusive MODBUS communication. Any faults which will not be detected by the soft starter will be detected by the MSR. Then it opens the line contactor. If the high short-circuit current exceeds the breaking capacity of the contactor the line contactor on so that the upstream fuse will switch off the fault current.

  • Up to 50°C ambient temperature
  • Comprehensive protection functions
  • Current- and voltage metering
  • 10x PT 100 inputs
  • Real time clock



  • Illuminated LCD with 2 lines of 16 characters each
  • Selectable languages: English, German, French or Spanish (aditional on request)
  • The LCD indicates the motor current, fault descriptions and statistical data.
  • The LEDs provide a quick status indication. (control voltage on, motor soft start, motor on, motor soft stop, motor stop, fault)
  • Easy settings by six clearly marked keys, user-friendly software with factory default parameters.

Communication RS 485

Modbus Profibus

RS 485 with MODBUS or PROFIBUS protocol enable:

  • Remote (start, stop, etc.)
  • Monitoring (motor current, faults, statistical data)
  • Remote parameter setting
  • Remote reset