• U - Refers To Disc Suspension Insulator
• 240 - Indicates a rated Mechanical failing load of 240kN
• B - For Ball And Socket Type
• 170 - Indicates that the height of the insulator structure is 170mm
• 280 - Indicates that the diameter of the insulator disc is 280mm
• 400 - Indicates that the creepage distance of the insulator is 400mm

• Type: Standard profile Toughened Suspension Type
• Rated mechanical load: 240kn (about 24tons)
• Purpose: Widely applicable as insulation support for medium and high voltage transmission lines and substation equipment, capable of stable operation under various climatic conditions.

• The product model is in accordance with IEC60383-1:1993, MOD / GB/T1001.1
• The connection structure is in accordance with GB/T4056-2008 (IEC60120:1984, MOD) and BS 3288 part lll.
• According to customer requirements, the locking pin can be either W-pin or R-pin.
• If there is no special instruction, R pin is used for U240B.

Suspension insulators consist of the following elements:

• One dielectric made of toughened glass with appropriate properties and shape for environmental conditions.
• One hot-dip galvanized nodular or ductile malleable cast iron cap.
• One hot-dip galvanized forged steel pin.
• Cap and pin assembly using aluminous cement for thermomechanical strength.

Lastly, the insulator cap has a stainless steel or phosphor bronze locking device (split pin) which secures the coupling of the units.

The pins may be protected using an anti-corrosion zinc sleeve (sacrificial anode) upon request, strongly recommended for lines with heavy pollution.