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SMC molded busbar insulator supports provide mechanical positioning and electrical isolation for busbars in power distribution and transmission systems. The components are manufactured through compression molding with sheet molding compound (SMC), a glass-fiber-reinforced unsaturated polyester composite material. As an alternative to traditional ceramic busbar supports, SMC components have lower mass per unit volume and inherent corrosion resistance. The compression molding process supports consistent dimensional accuracy across production batches, which supports uniform installation across large-scale projects. These insulator supports are engineered for medium-voltage electrical setups, and suit the requirements of electrical contractors, substation operators, and renewable energy project developers.
The SMC composite has inherent dielectric properties that create electrical separation between energized busbars and grounded metal frameworks. The material maintains stable insulation performance within its rated temperature range, and supports deployment in systems with rated power-frequency voltages up to 36 kV. The one-piece molded structure eliminates internal gaps that may cause partial discharge, supporting consistent insulation performance throughout the service life. The material does not absorb moisture, so insulation performance remains stable in high-humidity environments.
Glass fiber reinforcement within the SMC matrix provides structural strength to carry static busbar weight, and also delivers resistance to mechanical shock and vibration. The composite material resists degradation from common industrial chemicals and salt-laden air. SMC supports have a lower mass than ceramic supports of equivalent dimensions, which reduces load stress on mounting panels and simplifies transport and on-site handling. The material retains its physical and electrical properties across a working temperature range from -40°C to 120°C. The resin matrix includes UV-stabilizing additives, so the components resist UV-related degradation for long-term outdoor use.
Parameter | Specification |
|---|---|
Base material | Glass-fiber reinforced SMC (Sheet Molding Compound) |
Rated power-frequency voltage | Up to 36 kV |
Bending strength | ≥ 120 MPa |
Working temperature range | -40°C to 120°C |
Flammability rating | UL 94 V-0 |
UV aging performance | Passed 1000h accelerated UV aging test |
Standard mounting type | Single bolt-on base |
SMC molded busbar insulator supports fit within the compact internal space of low-voltage and medium-voltage switchgear cabinets. The compact molded design supports dense busbar arrangements, and the non-corrosive material suits enclosed cabinet environments with regular temperature fluctuations. The consistent molded dimensions support standardized assembly in mass-produced switchgear units.
In power substations and distribution networks, these supports maintain stable busbar positioning for both indoor and outdoor installations. The shock and vibration resistance aligns with operational requirements for substation equipment, and the UV-stable formulation works for outdoor pole-mounted and station-level setups. The low weight reduces structural load on substation mounting frames.
For solar farms and wind power installations, SMC busbar supports adapt to outdoor exposed environments and variable load conditions. The lightweight structure reduces on-site installation labor for distributed power projects, and the material resists degradation from long-term exposure to sunlight and temperature cycles.
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These supports are designed to align with IEC 60859 specifications for busbar systems in low-voltage and medium-voltage switchgear and controlgear assemblies. Material testing follows relevant IEC and ASTM standards for electrical insulation composite materials.
Yes, the insulator supports work with both copper and aluminum busbars of standard thicknesses. The mounting slots accommodate common busbar hole patterns, and the SMC material does not induce galvanic corrosion with either busbar metal.
The SMC composite material resists salt spray and atmospheric corrosion, making it suitable for coastal outdoor installations. Long-term exposure to saline air does not cause measurable material degradation or reduction in insulation performance.
Standard units use a single-bolt bottom mounting design, compatible with common switchgear and substation mounting panels. Custom mounting hole positions and top fixation configurations are available for project-specific requirements.
