The OCK 20-10-4 type polymeric support insulators are designed for insulating and securing live parts in electrical apparatus and distribution devices of power plants and substations operating with alternating current at voltages up to 10 kV and frequencies up to 100 Hz. They provide reliable insulation in ambient temperatures ranging from -60 °C to +50 °C.

Technical Specifications:

• Rated bending strength: 20 kN
• Rated torsional strength: 1.0 kN·m
• Structural height (H): 284 mm
• Insulation height (L): 145 mm
• Creepage distance: at least 460 mm
• Withstand voltage:
  • lightning impulse: 85 kV
  • 50 Hz in dry conditions: 45 kV
  • 50 Hz under rain: 30 kV
• 50 Hz flashover voltage in polluted and wet conditions: at least 13 kV
• Rated specific surface conductivity of pollution layer: 30 µS
• Permissible pollution degree (PD) according to GOST 9920: IV

The insulators comply with the climatic version and placement category UHL1 according to GOST 15150, are manufactured according to TU 3494-024-82442590-2015, and meet the requirements of GOST R 52082.