Current-Limiting Fuse Tubes in Epoxy Glass

Bodies for current-limiting links, built to the clearing spec. Current-limiting links clear fault current fast and generate high internal energy. The body must contain that energy and keep dimensions. We build it in epoxy glass or ceramic epoxy glass per the clearing spec. We review the clearing current and energy with you and select the wall and material before production.

Bodies for current-limiting links, built to the clearing spec. Current-limiting links clear fault current fast and generate high internal energy. The body must contain that energy and keep dimensions. We build it in epoxy glass or ceramic epoxy glass per the clearing spec. We review the clearing current and energy with you and select the wall and material before production. For many links yes; for

Technical specifications

Material	Epoxy glass / ceramic epoxy glass
Use	Current-limiting links
Control	Wall per clearing energy
Standard	ASTM D2583 (G10), IPC-4101 (FR-4), IEC 60672 (thermal).
Operating temperature	-40 °C to +130 °C
Dielectric strength	≥ 20 kV/mm (per ASTM test method)

Applications by industry

• Current-limiting fuse bodies for MV primary circuits
• HRC fuse link barrels rated to defined KA breaking capacity
• Motor-circuit current-limiting fuses
• Transformer primary HRC fuse bodies
• Capacitor and feeder protection HRC links
• Fuse bodies machined to IEC 60282-1 for MV networks

Why epoxy fiberglass for this application

Epoxy-glass fuse bodies confine the arc inside the bore, letting the quartz-fibre filler act in current-limiting mode. The epoxy matrix holds the bore geometry steady under the thermal ring before clearing, which matters for repeatable let-through performance.

Bore surface finish and concentricity govern arc confinement. Confirm filler spec and end-cap seal integrity at assembly. Not for liquid-fill service unless resin grade changed.

Standards: IEC 60282-1 (HV current-limiting fuses), UL 248, ASTM D709 (epoxy glass).

Feature and remaining-wall review

Machining Current-Limiting Fuse Tubes in Epoxy Glass uses diamond-coated tools so the edges stay clean, with CNC turning, grinding and drilling to your drawing. Dimensional stability is good when moisture content is controlled. Feature depth, edge distance and remaining wall are reviewed before quotation, and capability follows your drawing rather than a general tolerance.

Inspection and traceability

We state the control plan with you. Batch traceability links raw material lot to finished part.

• First-article inspection (FAI) per your plan
• In-process dimensional checks at every station
• Batch certificate of conformance (COA) supplied on request
• Lot traceability to incoming material certificate
• Dielectric strength and insulation resistance testing available on request

Related components

Common questions

Engineering Guides & Selection Notes

Engineering notes covering the sizing and specification questions around Current-Limiting Fuse Tubes in Epoxy Glass.

• → Fuse Tube Material Guide: Vulcanized Fiber, Ceramic Epoxy Glass and Melamine
• → High-Voltage vs Low-Voltage Fuse Tube: Same Name, Different Engineering
• → Vulcanized Fiber vs FR-4 vs GPO-3: Which Insulation Tube for Your Fuse Link