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Home > Standard Type > China U300B High Voltage Superior Quality Disc Suspension Toughened Glass Insulator Manufacturer, Factory
China U300B High Voltage Superior Quality Disc Suspension Toughened Glass Insulator Manufacturer, Factory
China U300B High Voltage Superior Quality Disc Suspension Toughened Glass Insulator Manufacturer, Factory
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China U300B High Voltage Superior Quality Disc Suspension Toughened Glass Insulator Manufacturer, Factory
China U300B High Voltage Superior Quality Disc Suspension Toughened Glass Insulator Manufacturer, Factory

China U300B High Voltage Superior Quality Disc Suspension Toughened Glass Insulator Manufacturer, Factory

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Product Description

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Product Information
U300B Product Information
  • Model: U300B
  • U: Refers To Disc Suspension Insulator
  • 300: Indicates a rated Mechanical failing load of 300kN
  • B: For Ball And Socket Type
  • 195 - Structural height: 195mm
  • 320 - Insulator disc diameter: 320mm
  • 485 - Creepage distance: 485mm
  • Type: Standard profile Toughened Suspension Type
  • Rated mechanical load: 300kn (approx. 30 tons)
  • Purpose: Insulation support for medium and high voltage transmission lines and substation equipment across various climatic conditions.
  • Complies with IEC60383-1:1993, MOD / GB/T1001.1
  • Connection structure matches GB/T4056-2008 (IEC60120:1984, MOD) and BS 3288 part III.
  • Locking pin options: W-pin or R-pin (Default: R-pin for U300B).
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Product Drawing
Product drawing
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Product Parameters
IEC Designation U300/195
Mechanical failing load kn 300
Diameter D mm 320
Height H mm 195
Creepage distance L mm 485
Socket coupling mm 24
Wet power frequency withstand voltage kv 50
Dry lightning impulse withstand voltage kv 130
Power frequency puncture voltage kv 130
Radio interference voltage (10kV 1MHz) μv 50
Corona visual test kv 18/22
Power frequency electric arc voltage ka 0.12s/20Ka
Impulse puncture voltage P.U 2.8
Net weight per unit kg 10.6
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Suspension Insulator Components
Component Diagram

The suspension insulator is composed of the following key elements:

  • Dielectric: Toughened glass with specialized properties for harsh environmental conditions.
  • Cap: Hot-dip galvanized nodular or ductile malleable cast iron.
  • Pin: Hot-dip galvanized forged steel.
  • Assembly: Secured with high-performance aluminous cement for thermomechanical strength.
  • Locking Device: Stainless steel or phosphor bronze split pin (locking device).
  • Protection: Optional zinc sleeve (sacrificial anode) on pins for heavy pollution areas.
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Product Display
U300B Display 1 U300B Display 2 U300B Display 3
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Frequently Asked Questions
What does the "300" in the U300B model represent?
The "300" indicates that the insulator has a rated mechanical failing load of 300kN, which is approximately equivalent to 30 tons.
Which standards do these insulators comply with?
They are manufactured in accordance with IEC60383-1:1993, GB/T1001.1, and the connection structures follow IEC60120 and BS 3288 part III.
What is the default locking pin for the U300B?
The default locking device used for the U300B model is the R-pin, though W-pins can be provided upon customer request.
Are these insulators suitable for high-pollution environments?
Yes, for lines located in heavily polluted areas, we recommend the optional anti-corrosion zinc sleeve (sacrificial anode) for additional pin protection.
What materials are used for the main components?
The insulator consists of a toughened glass dielectric, a hot-dip galvanized cast iron cap, and a hot-dip galvanized forged steel pin, all assembled with high-strength aluminous cement.

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