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Low voltage motor protection and control device
( ECM800 )



ECM800 low voltage motor protection and control device is designed for protecting the low voltage motors from various fault conditions. It is an intelligent unit with high cost-effective and stability. It integrates relay protection, measurement, control and communication all in one,
ECM800 samples the 3- phase current, 3-phase voltage, zero-sequence current. The data are then applied to the algorithms and compared to the device¡¯s configuration information. Based on the result of the comparison, the controller may trip one or more of the on-board control relays.



  • Compact designed integrates measurement, protection, control and communication
  • Provides 7 types of standard functions and 8 types of optional protection functions
  • Provides 10 types of motor starting mode
  • Build-in CTs for rated current up to 100A
  • LED indicators in main module
  • Optional panel for local operation
  • Reliable electromagnetic compatibility
  • DIN rail mounting


Performance Index

  • Standard: GB/T14048.1, GB/T14048.4, GB/T17626.2/3/4/5
  • Power frequency withstand voltage: AC2kV/ min. ~1mA Input--Output--Power
  • Insulation resistance £¾50M¦¸
  • Impulse withstand voltage: 5kV (peak), 1.2/50uS
  • Digital input: 8 routes, external power supply. (internal power supply is available upon special require in order.)
  • Relay output: 4 relays, 3NO, 1NC
  • Capacity of control relay output:250VAC/10A or 30VDC/ 5A
  • Analog output load resistance: 350¦¸
  • Power supply input: 85~265VAC, 80~ 300VDC
  • Communication protocol: RS485 port/ MODBUS protocol, optional PROFIBUS-DP module
  • Electrical fast transient/burst immunity test: IEC61000-4-4, Level 3
  • Surge immunity test: IEC61000-4-5, Level-3
  • Electrostatic discharge immunity test: IEC61000-4-2, Level 3
  • Radiated immunity test: IEC61000-4-3, Level 3
  • Operating temperature: -20~ 55¡æ, humidity: 10~90%, non-condensing
  • Storage temperature: -40~70¡æ, humidity: 10~95%, non-condensing

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