U40B Toughened Glass Disc Insulator 40kN

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Product Overview

The smallest disc in the U-series toughened glass suspension range, designated U40B/110 to IEC. Diameter is 178 mm, height 110 mm and creepage 185 mm, with an 11 mm socket coupling. Mechanical failing load is 40 kN with a 20 kN routine test, and the electrical figures are 25 kV wet power frequency withstand, 50 kV dry lightning impulse and 90 kV power frequency puncture.

Why Buyers Choose This Part

• 40 kN failing load with a 20 kN mechanical routine test on every disc
• 178 mm diameter keeps string weight and wind load down on light lines
• 11 mm socket coupling matches light-duty string hardware
• Toughened glass shows a puncture by shattering, visible from the ground

Where It Is Used

• Light distribution and sub-transmission suspension strings
• Short spans where a 70 kN disc is more than the design needs
• Dead-end and tension assemblies on small conductors
• Replacement of aged U40B discs on existing strings

Who It Suits

• Overhead line contractors building light suspension strings
• Utilities maintaining older U-series strings
• Distributors stocking IEC glass disc insulators

What Goes Wrong Without The Right Part

• Oversized discs that add unnecessary weight and cost to a light line
• Punctured units that cannot be found on a visual patrol
• Coupling mismatch when the string hardware is 11 mm
• Strings assembled from mixed disc ratings that no one has documented

How It Is Built

• IEC designation U40B/110
• 178 mm diameter and 110 mm height
• 185 mm creepage distance
• 11 mm socket coupling
• 40 kN mechanical failing load, 20 kN mechanical routine test
• 25 kV wet power frequency withstand voltage
• 50 kV dry lightning impulse withstand voltage
• 90 kV power frequency puncture voltage
• 50 µV radio influence voltage, 18/22 kV corona visual test

Published Figures For This Product

Every value below comes from the manufacturer data for this item. Figures not listed are confirmed against the drawing before an order is placed.

Creepage Distance	185 mm
Socket Coupling	11 mm
Wet Power Frequency Withstand Voltage	25 kV
Dry Lightning Impulse Withstand Voltage	50 kV
Power Frequency Puncture Voltage	90 kV
50 Μv Radio Influence Voltage, Corona Visual Test	18/22 kV

Materials

• Toughened glass dielectric
• Galvanised cap and pin
• Portland cement bonding

Process

• Glass pressing
• Thermal toughening
• Cementing
• Galvanising
• Mechanical routine test

Testing

• 20 kN mechanical routine test on every disc
• Power frequency puncture test to 90 kV
• Corona visual test at 18/22 kV

Certification

• IEC designated U40B/110
• ISO 9001 quality management system

Customisation Options

• Other U-series ratings from 40 kN up to 160 kN
• Coupling sizes from 11 mm to 20 mm
• Cap marking on request

How It Compares

U70B disc	U70B is 255 mm in diameter with 320 mm creepage and a 70 kN failing load. Step up to it when the span or conductor size needs more mechanical margin.
Porcelain disc of the same rating	A punctured glass disc shatters and is spotted on patrol, while a punctured porcelain disc normally looks intact.

Before You Order And After It Arrives

• Check the string hardware takes an 11 mm socket coupling
• Do not mix disc ratings within one string
• Fit split pins fully on every coupling during assembly
• Log the rating used per span so future replacement matches

U40B Toughened Glass Disc Insulator 40kN Questions

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