In medium voltage switchgear applications, insulation performance is critical to ensuring system safety, compact design, and long-term operational stability. Among various insulation materials, epoxy resin insulators are widely used for their superior electrical properties, mechanical strength, and adaptability to complex internal structures.
A well-designed switchgear insulation system must prevent dielectric breakdown, withstand partial discharge, and maintain performance even under harsh environmental conditions such as humidity, dust, and thermal cycling. Below are the most common and vital epoxy insulation components used in switchgear:
Contact boxes are essential for isolating live parts and connecting circuit breakers or load switches. Made from cast epoxy resin, they ensure high dielectric strength and excellent tracking resistance. Their structural design supports compact switchgear layouts without compromising safety.
2. Epoxy Sensor Housings (for CT and PT)
Voltage and current sensors require precision-encapsulated insulation to ensure accurate signal transmission and safe separation from high-voltage conductors. Epoxy housings offer dimensional stability and excellent shielding against electromagnetic interference.
Wall bushings connect internal switchgear conductors with external cables or busbars. Epoxy bushings are ideal due to their high mechanical stability, excellent weather resistance, and superior insulation performance even under load conditions.
Used to support and insulate busbars or other energized components inside the cabinet. These post insulators are designed to withstand mechanical stress, high voltage, and environmental aging, making them a staple in metal-clad and gas-insulated switchgear.
5. Epoxy Fuse Bases and Supports
For switchgear equipped with protective fuses, epoxy fuse bases provide both secure mechanical mounting and electrical insulation. Their arc-resistance and temperature tolerance are crucial during fault conditions.
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Each of these components contributes to building a reliable and compact switchgear system, enhancing operational safety while meeting modern miniaturization and modular design requirements.
At Putai, we provide a full range of epoxy resin insulation components for switchgear, tailored for 12kV to 40.5kV systems. Our solutions emphasize system-wide coordination, from material selection to precise manufacturing, helping OEMs and utilities achieve high-performance insulation systems that meet global standards.
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