NDG3A-250 disconnecting switches are applicable to the AC/DC power system and mainly installed in the low-voltage distribution circuit. The products can be used for infrequent making and breaking as well as to isolate and break the circuit in the energy storage, power, construction and other industries. With the frame current of 400A, the products are used in the power line with the rated voltage of AC690V (50/60Hz) and below, or DC500V and below. 

Electrical Specification:

  • Agreed thermal current Ith (A) : 250
  • Number of poles: 3, 4
  • Rated insulation voltage Ui (V): 800
  • Rated impulse withstand voltage Uimp (kV): 8
  • No protection device for the rated short time withstand current Icw (1s.kA effective value): AC: 7; DC: 3
  • Rated short circuit making capacity Icm (kA peak value):  AC: 18; DC: 12Ie
  • Mechanical life (times):10000
  • Electrical life (times): 1000
  • Operating torque (N.m): 6.5
  • Installation mode: Screw mounting
  • External dimensions 4P (length×width×height): 170×135×65
  • External dimensions 3P (length×width×height): 140×135×65
  • Applicable standards: GB14048.1, GB14048.3, IEC60947-1, IEC60947-3
  • Product certification: CCC, CE, TUV
  • Single-phase internal resistance (mΩ): 0.8
  • Minimum copper cable cross section (mm2): 63A: 35; 100A: 50; 125A: 50;

160A: 95; 200A: 120; 250A: 150

  • Minimum tightening torque of copper cable connection (N.m): 12

Working Environment:

  • Altitude: ≤2000m
  • Operating ambient temperature: -25℃~55℃ (the testing ambient temperature of UPS is 40℃)
  • Pollution Degree: Level 3
  • Operating/storage relative humidity: The relative humidity at an ambient temperature of +40 should not exceed 50%. A higher relative humidity is allowed at a lower humidity.
  • The product can be disposed in places that are free from explosive media, media corrosive to metal, insulation damaging gas, and conductive dust. The product should be avoided from snow and rain. 
  • Protection class: IP20 for the complete appliance, handle outside a cabinet: IP65..
  • Installation Category: III & IV
  • Storage environment: -50℃~+80℃


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