• china meter
  • Professional Manufacturer Of Power capacitor,Power controller etc.

Intelligent switch

    Name:ZMFK Intelligent switch

  • Intelligent switch

  • ZMFK series intelligent combined switch is applicable for the switch over of low voltage reactive power compensation, what is developed for replacement of shortcoming of silicon control no-contacting solid state relay and AC contactor in respect of reactive power compensation. The main character is that it has combine the advantages of ac contactor and silicon control, when switching the capacitor it can assure of closing during voltage passing through zero and opening during current pas sing throughzero, during s witching the surge current and over voltage are small, contact does not burn and melt, not voltage down and no loss and no harmonic wave happen there.
  • Control function
  • 1)Auto searching to find the best opportunity to switch, quick response.
  • 2)When the switch is taking action, closing at voltage through zero, opening at current through zero.
  • Protection function
  • 1)When phase failure, switch will automatically self-lock and close
  • 2)At normal operation, if phase failure occur, the response time not more than 0.2s
  • 3)When system is out of power supply, switch will automatically trip, response time not more than 0.2s
  • Displaying function
  • The switch has the indication of ON, OFF, and phase failure
  • Ambient conditions
  • 1)Temperature: -40 ~ 70
  • 2)Relative humidity: < 50% at +40 ; < 90% at 20
  • 3)Altitude not more than 2000m
  • 4)Vibration: no severe vibration and impact allowed.
  • Operating conditions
  • 1)Input control value:
  • a. Voltage signal: High potential (3.8 ~ 24V) for control switching on, low potential (0V ~ 0.7V) for control tripping, DC input resistance 2K
  • b. Contacting signal: AC220V, contact closed, to control switch on, contact opening, to control switch off, input resistance 30K
  • 2)Power consumption: public compensating switch not more than 3W, separately compensating switch not more than 5W.
  • 3)Input performance: at normal use, insulating resistance not less than 10M , insulating level between phase to enclosure or to earth: AC2500V 50Hz, 1min
  • Characteristics
  • The contacting resistance of the switch 0.002 , the temperature rise at rated current 10
  • The system voltage is within 20% ~ +15% rated voltage, it can work normally
  • During switching the surge current is not more than 1.5 times of rated current of the capacitor
  • Switch response time 30ms, the space between two operations: public compensating switch: 45A (38 0V) 30s; others 6s
  • the residual voltage on the terminals of the capacitor is not more than the one which it occur when a t 100% rat and voltage the cur rent pas s through zero.
  • When closing at dynamic voltage through zero zero-point voltage shall not more than 1.5% rated voltage (electric phase angle 1.5 )
  • Operation life: 3x100000
  • Operations
  • Model Rated voltage Rated current Rated control capacity Connection way Control sign
    TTL potential    		 Contact
    ZMFK-45-380(△)-1 380 45 30 △ 1  
    ZMFK-30-380(△)-1 380 30 20 △ 1  
    ZMFK-20-380(△)-1 380 20 10 △ 1  
    ZMFK-45-380(Y)-1 220 45 10 Y 1  
    ZMFK-30-380(Y)-1 220 30 7 Y 1  
    ZMFK-20-380(Y)-1 220 20 5 Y 1  
    ZMFK-45-380(△)-2 380 45 30 △   2
    ZMFK-30-380(△)-2 380 30 20 △   2
    ZMFK-20-380(△)-2 380 20 10 △   2
    ZMFK-45-380(Y)-2 220 45 10 Y   2
    ZMFK-30-380(Y)-2 220 30 7 Y   2
    ZMFK-20-380(Y)-2 220 20 5 Y   2