GPO-3 Sheet Applications, Specifications & CNC Machined Parts

GPO-3 applications in switchgear, circuit breakers and motors. Get GPO-3 sheets, custom profiles and CNC machined insulation parts.

GPO-3 Introduction

GPO-3, also known as UPGM203, is a widely used glass fiber reinforced polyester laminate in the electrical insulation industry. It is manufactured using glass fiber mat as the reinforcement material and unsaturated polyester resin as the matrix, through a process involving heat and pressure to produce a rigid insulating material with excellent mechanical strength.

GPO-3 is specifically designed for electrical equipment requiring high levels of electrical insulation, arc resistance, flame retardancy, and dimensional stability.

Compared with traditional insulation materials, GPO-3 combines excellent electrical properties, mechanical performance, and machining flexibility, offering a good balance between performance and cost.

Applications of GPO-3 in Electrical Equipment

Due to its excellent electrical insulation, mechanical strength, arc resistance, and flame-retardant properties, GPO-3 is widely used in medium- and high-voltage switchgear, circuit breakers, electric motors, frequency converters, power conversion equipment, and electrical distribution systems.

Its main applications include rigid insulating structural components, electrical barriers, and mechanical support parts.

1. Medium- and High-Voltage Switchgear

Switchgear is one of the most important application areas for GPO-3.(Learn more about the application of GPO3 in switchgear)

In medium- and high-voltage switchgear, various insulating components are required to effectively isolate conductive parts at different electrical potentials and ensure safe equipment operation.

GPO-3 is commonly used to manufacture:

• Busbar support plates
• Internal insulation barriers
• Insulating support beams
• Cable channel support structures
• Internal insulating brackets

Why Is GPO-3 Used in Switchgear?

During operation, switchgear components are exposed to electrical and mechanical stresses. Internal insulating components must provide reliable electrical isolation while maintaining sufficient mechanical strength.

GPO-3 offers excellent resistance to tracking and arc formation, together with good mechanical rigidity, making it suitable for internal insulating structures in switchgear.

2. Circuit Breakers

A circuit breaker is an electrical device designed to make, carry, and interrupt normal operating currents as well as fault currents.

During current interruption, an electric arc may occur inside the circuit breaker, exposing insulating materials to high temperatures and thermal stress.

GPO-3 can be used to manufacture various insulating components in circuit breakers, including:

• Arc barriers
• Safety shields
• Insulating partition plates
• Phase barriers
• Internal insulating support components
• Arc chamber structural components

Why Is GPO-3 Used in Circuit Breakers?

GPO-3 offers excellent arc resistance and flame-retardant properties, helping protect internal insulating structures from arc-related damage.

Its good mechanical strength also helps ensure that insulating components maintain their required structural stability during equipment operation.

3. Electric Motors and Generators

GPO-3 can also be used as a rigid electrical insulation material in electric motors and generators.

Typical applications include:

• Motor insulation support plates
• Motor insulating cover plates
• Terminal support components
• Brush holder components
• Insulating spacer blocks
• Structural insulating brackets

In these applications, GPO-3 primarily provides mechanical support and electrical isolation between conductive components.

Its good machinability also allows motor manufacturers to produce customized insulating components according to specific equipment design requirements.

Material Selection Tip: For motor slot insulation and winding insulation, flexible insulation materials such as DMD, NMN, and NHN are generally more suitable. GPO-3 is primarily used for rigid insulating structural components.

4. Frequency Converters and Power Conversion Equipment

Frequency converters and power conversion equipment are widely used in industrial power control systems.

These devices contain high-voltage electrical components, busbars, power switching devices, and power modules.

With its good mechanical strength and electrical insulation properties, GPO-3 is suitable for rigid insulating structures in power electronics equipment.

5. Electrical Insulation Supports and Structural Profiles

In addition to flat sheets, GPO-3 can also be processed into various insulating profiles.

These profiles are widely used in electrical cabinets, switchgear, and power equipment.

Common GPO-3 profiles include:

GPO-3 profiles provide both mechanical support and electrical insulation, helping equipment manufacturers simplify internal structural designs.

6. Transformers and Low-Voltage Electrical Equipment

GPO-3 can also be used in certain transformer and low-voltage electrical equipment applications, particularly where rigid, flame-retardant insulating structures are required.

GPO-3 Sheet Technical Specifications

What Are the Differences Between GPO-3, FR4, and G10?

GPO-3, FR4, and G10 are all glass fiber reinforced electrical insulation laminates. However, they use different resin systems, resulting in differences in their performance characteristics and application areas.

How to Choose the Right Insulation Material?

Choose GPO-3: When equipment requires excellent arc resistance, tracking resistance, and flame retardancy, GPO-3 is a strong material choice.

Choose FR4: When flame-retardant epoxy glass fabric laminate is required, together with good mechanical properties, FR4 is a suitable option.

Choose G10: When the primary requirements are high mechanical strength and electrical insulation, and flame retardancy is not required for the standard grade, G10 can be considered.

Actual material selection should be based on the specific product grade, thickness, applicable testing standards, and operating environment.

GPO-3 Insulation Material Manufacturer and Supplier – Xujue Electrical

Xujue Electrical is a professional electrical insulation material manufacturer with a manufacturing history dating back to 1958.

We specialize in providing electrical insulation material solutions for manufacturers of transformers, electric motors, generators, switchgear, and other electrical equipment.

Why Choose Xujue Electrical?

• Extensive Manufacturing Experience: More than 65 years of experience in electrical insulation material manufacturing.
• Comprehensive Product Range: We supply GPO-3, G10, G11, FR4, 3240 epoxy sheets, and other electrical insulation materials.
• Custom Machining Capabilities: CNC machining, drilling, cutting, milling, and custom profile fabrication are available.
• Various Product Specifications: Different thicknesses, dimensions, colors, and surface finishes are available.
• Professional Technical Support: We recommend suitable insulation materials according to customers’ specific applications and technical requirements.
• Global Supply Capabilities: We provide products and services to international electrical equipment manufacturers and industrial customers.

Whether you need standard GPO-3 insulation sheets or customized electrical insulation components, Xujue Electrical can provide suitable material solutions based on your drawings and technical specifications.

Contact Xujue Electrical to get a quotation and technical support for GPO-3 insulation sheets, custom profiles, and CNC-machined insulation components.