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Selecting the Right Epoxy Insulator Series for Your Application

12 10, 2025
Posted By: Peter

In modern power distribution and substation equipment, the performance and reliability of epoxy insulators are critical to system integrity. Selecting the correct type is essential for ensuring long-term safety and minimizing maintenance in demanding environments, from compact switchgear to outdoor substations.


For high-voltage connection and support within substation and switchgear applications, the ZJ Series 12kV/24kV Post Insulators offer an optimal solution. Manufactured with high-grade cycloaliphatic epoxy resin, these post insulators provide exceptional tracking resistance, mechanical strength, and long-term performance stability. Their design is rigorously tested to comply with major international standards, ensuring high-quality compliance and reliability in medium-voltage systems.

 

Selecting the Right Epoxy Insulator Series for Your Application


In busbar insulation and support, the SM Bus Bar Insulator (DRUM type) stands out. Its unique drum shape and thermosetting insulation material ensure uniform dielectric stress distribution and superior creepage distance. This design makes it one of the best materials for thermoplastic insulators in terms of durability and resistance to environmental contaminants, which is vital for substation busbar reliability.


The choice between post and busbar epoxy insulators depends on specific electrical, mechanical, and environmental requirements. Key selection factors include rated voltage, BIL (Basic Insulation Level), mounting configuration, and the presence of corrosive atmospheres. Proper matching of the insulator to its application is fundamental for achieving performance stability and system longevity.


Putai supplies a comprehensive range of high-performance epoxy insulators, including the ZJ Series and SM Bus Bar Insulator. Each product is engineered for high-quality compliance and performance stability. Putai also supports customization and the supply of related medium-voltage accessories to meet system integration needs. For tailored insulator solutions that enhance your system's reliability, contact our technical team.

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ZJ Series 12kV Post Insulators
  • Material:High-strength epoxy resin for durability
  • Creepage Distance:Optimized for outdoor and polluted environments
  • Insulation Performance:Excellent dielectric strength and insulation resistance
  • Compact Structure:Space-saving design with reliable mechanical properties
  • Low Partial Discharge:Ensures stable electrical performance
  • Corrosion Resistant:Performs well in harsh environmental conditions
  • Versatile Sizes:Supports various installation configurations
SM Bus Bar Insulator(DRUM)
  • Made of Epoxy Resin: Delivers high dielectric strength and thermal resistance.
  • Excellent Mechanical Stability: Rigid molded body ensures long-term structural integrity.
  • Reliable for Medium & Low Voltage Systems: Ideal for 380V–12kV power bus bar support.
  • Embedded Brass/Iron Inserts: Provide strong and secure mounting.
  • Heat-Resistant: Operational range from -40°C to +140°C.
  • Compact DRUM Design: Space-efficient and easy to install in panels.
  • Customizable: Insert type, thread size, and resin color can be tailored on request.
11kV / 12kV Series Post Insulators
  • Excellent Voltage Resistance:Withstands power frequency voltage from 38kV to 42kV and lightning impulse voltage from 75kV to 85kV.
  • Epoxy Resin Construction:Provides excellent electrical insulation and environmental resistance.
  • Various Size Options:Available in different sizes to meet the installation needs of various electrical equipment.
  • Applicable to Various Equipment:Widely used in indoor switchgear, circuit breakers, isolators, and medium voltage switchgear.
  • Reliable Performance:Ensures long-term stable operation of equipment in medium voltage power systems.
ZJ-24KV Series Post Insulators
  • High Voltage Resistance:Power frequency withstand voltage of 65kV and lightning impulse withstand voltage of 125kV, protecting against high voltage impacts.
  • Epoxy Resin Material:Excellent electrical insulation and environmental resistance.
  • Various Size Options:Suitable for installation in different electrical equipment.
  • Applicable to Various Equipment:Widely used in high voltage breakers, medium voltage equipment, GIS, and outdoor switches.
  • Reliability Assurance:Ensures stable operation of equipment in high voltage power systems.
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