NDGR2-1250 isolating switch fuse group applied to ac 50 hz, rated voltage of AC400V, AC690V, rated current 1250 a low-voltage distribution network, or motor as infrequently connected, breaking circuit and circuit isolation. Available with short circuit protection, overload protection function.

Products are widely used in construction, electric power, chemical and other industries of electric power transmission and distribution, automation systems, etc.

Electrical Specification:

  • Rated Isolation Voltage Ui: 1250V
  • Rated Operating Voltage Ue: AC400V, AC690V, DC500V
  • Rated Impulse Voltage Uimp: 12kV
  • Rated Operating Current Ie (A)/Power AC(cosφ=0.45)

400V AC-23B A/kW    1250/660

690V AC-23B A/kW    1250/1110

  • Fuse-link: 1250A Max
  • Rated Making Capacity: 690V AC-23B 12500A
  • Rated Breaking Capacity: 690V AC-23B 10000A
  • Rated Limit Short-circuit Current:  100kA @400V

                                50kA @690V

  • Auxiliary Switch: 380V AC-15  6A

               220V DC-13  0.6A

  • Electrical Life: 100 times
  • Mechanical Life: 1000 times
  • Operating Torque: 38Nm

Working Environment:

  • Altitude: ≤2000m
  • Ambient Temperature: -25~+55℃, and average temp. no more than +35℃ in 24H. Drop capacity should be considered when environment temperature is higher than 40 ℃
  • Pollution Degree: 3
  • Under normal use, the limit humidity should not exceed 90% and last more than 24 hours, and measures to prevent condensation should be taken. Environmental humidity is correlated with temperature. When the ambient temperature is high, the relative humidity is required to be lower. If the temperature exceeds +40℃, the relative humidity is not more than 50%.
  • Installation Category: III & IV
  • Product should be installed in a place without significant shake, shock vibration, snow hit, and there is no explosion hazard installation location should be medium, and medium without enough to corrosive action on metals, and damage the insulation gas and dust. 


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