The PS120SS R 112W suspension glass insulator is designed for insulating and suspending conductors and ground wires at substations, power plants, and overhead transmission lines with direct and alternating current, for voltage classes above 1000 V with frequencies from 50 to 100 Hz, operating in temperature ranges from -60 °C to +50 °C. The insulator is manufactured according to TU 3493-004-99267582-2009.

Technical specifications:

• Designation according to GOST 27661: U120B
• Designation according to IEC 60305: PS120SS R 112W
• Rated mechanical breaking load: 120 kN
• Rated mechanical residual breaking strength: 96 kN
• Nominal diameter of the insulating part: 255 mm
• Nominal structural height: 146 mm
• Nominal leakage path length: 415 mm
• Standard ball-and-socket coupling according to GOST 27396 (IEC 120-84): 16 mm
• Breakdown voltage in insulating medium: 130 kV
• Withstand voltage at 50 Hz (dry): 72 kV
• Withstand voltage at 50 Hz (wet): 42 kV
• Test voltage for impulse breakdown in air: 256–290 kV
• Withstand voltage of standard lightning impulse: ±110 kV
• Nominal voltage at permissible radio interference level: 34 dB/kV at 10 kV; 55 dB/kV at 18 kV; 75 dB/kV at 30 kV; 80 dB/kV at 35 kV
• Weight: 4.4 kg