Common Insulation Materials Comparison for High- and Low-Voltage Switchgear

Time: 02-02 2026 Auther: Xujue Electrical

In both high-voltage and low-voltage switchgear, insulation materials not only determine whether the equipment operat...

In both high-voltage and low-voltage switchgear, insulation materials not only determine whether the equipment operates safely but also directly affect the switchgear’s reliability, service life, and maintenance costs. Different voltage levels and operating conditions impose distinct performance requirements on insulation materials, yet their core role remains equally critical.

Epoxy sheet used in Gas-Insulated Switchgear (C-GIS)

Common Insulation Materials Comparison for High- and Low-Voltage Switchgear

1. Comparison of Insulation Materials Used in High- and Low-Voltage Switchgear

Insulation Material	Applicable Standard	High-Voltage Switchgear (≥10 kV)	Low-Voltage Switchgear (≤1 kV)	Typical Applications
G10 Epoxy Sheet	NEMA G10 / IEC EPGC201	Commonly used	Primary material	Busbar supports, phase barriers, structural insulation parts
G11 Epoxy Sheet	NEMA G11 / IEC EPGC203	Preferred	Partially used	High-temperature areas, high-current busbar supports
FR4 Epoxy Sheet	NEMA FR4	Auxiliary use	Commonly used	Secondary circuits, control units, flame-retardant areas
SMC / DMC	IEC / GB	Commonly used	Commonly used	Molded insulators, mounting bases
DMD Composite Insulation Paper	IEC 60626	Auxiliary use	Auxiliary use	Phase-to-phase and interlayer insulation
PET Polyester Film	IEC 60674	Limited use	Limited use	Insulating spacers, local insulation
Nomex® Insulation Paper	IEC 60819	Special projects	Limited use	High-temperature or premium applications

2. Key Selection Focus for High- and Low-Voltage Switchgear

Comparison Item	High-Voltage Switchgear	Low-Voltage Switchgear
Main concern	Dielectric strength, creepage distance	Mechanical strength, flame retardancy
Typical temperature rise	Relatively stable	Higher due to large current
Material selection logic	Performance-oriented	Cost-performance-oriented
Common structural materials	G11 > G10	G10 > FR4

3. Recommended Material Combinations (Engineering Practice)

Application Position	High-Voltage Switchgear	Low-Voltage Switchgear
Busbar supports	G11	G10 / G11
Phase barriers	G10 / G11	G10
Circuit breaker mounting parts	G10	G10
Secondary circuit supports	FR4	FR4
Auxiliary insulation	DMD / PET	DMD / PET

One-Sentence Professional Summary

High-voltage switchgear prioritizes insulation performance, while low-voltage switchgear places greater emphasis on mechanical strength and cost efficiency, resulting in different insulation material selection strategies.

Manufacturer selection

If you are looking for insulation materials for high and low voltage switchgear such as fr4/G10/G11 epoxy sheets, please contact Xujue Electrical. Which is a professional manufacturer of high-quality electrical insulation materials with more than 65 years of manufacturing experience.it can be customized according to the product specifications, thickness and purpose you need.
Contact us now to get detailed product information and quotation. We can also mail samples for free for your testing.

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