Solid core post Insulators

Solidcore post Insulators are used in substations as support insulators. They are basically used in

  • Isolators (Disconnectors)
  •  Pantographs
  •  Bus bar support
  •  Wave trap support
  •  Capacitor bank supports.
  •  Transmission & distribution as Line post insulators (Horizontal & Vertical).

These insulators are designed to provide a rigid support accounting for the bending and torsional loads. Modern’s Solidcore insulators are not only designed to meet the essential mechanical & electrical properties but also to effectively meet the loads arising out of short circuit, seismic, wind, thermal, ice and any other dynamic loads.

The insulators are made of high quality Aluminous porcelain meeting the requirements of C130 in accordance with the IEC: 60672. Apart from the visual and dimensional checks, the solidcore post insulator shells are subjected to ultrasonic tests prior to assembly. Precision machines are used to cut and grind the end faces to achieve the required surface finish and chamfer of the ends.

The metal flanges (hardware) are manufactured in-house eliminating the dependency on external suppliers for consistency in quality and delivery. They are galvanized using Zinc of 99.95 % purity with a minimum average coating thickness not less than 85 microns (610 g/m2).

The sand portion of the solidcore shells and the inner portion of the flanges are coated with a uniform layer of bituminous paint to offset the effect of differential thermal expansion between cement and metal parts. The insulators are assembled using high quality Portland cement in specialized fixtures that ensure the stringent dimensional requirements are met. They are subjected to curing under controlled conditions.

These insulators are then subjected to the requisite routine & acceptance tests prior to dispatch. Further visual inspection & random dimension checks are also carried out prior to packing the insulators in wooden crates / boxes / pallets.

Modern Insulators is the largest manufacturer of Solid Core Insulators in the country and has installed over 10 million insulators in various projects across the world. in voltages ranging from 33kV to 1200kV.

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Solid core Insulators Specification
Voltage Rating from 11kV up to 1200kV
Mechanical rating from 0.5KN to 60KN
Height from 255mm to 2300mm in single part and up to 9000mm in stack
Specific Creepage Distance from 12mm/kV to 40mm/kV
Applicable Standards IS, IEC, ANSI

Our Other Products


The hollow porcelain insulators are manufactured using high strength Aluminous porcelain and subjected to strict process and dimensional controls.This insulators protect the internal components from being exposed to the vagaries of the weather


The long rod insulators are subjected to static and dynamic loads including wind load, ice load, conductor galloping, short circuit forces etc. and are designed to withstand such loads constantly and continuously for decades.


Modern insulators has set the standards in the design, manufacture, testing and supply of insulators for railway traction application. We manufacture various categories of 25kV railway insulators addressing every need for the electrification of railway lines.