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. For many links yes; for
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) |
💾 Datasheets & Test Reports
Download the technical data sheet for this product (PDF).
Information required for quotation
| Base tube | Approved material grade, ID, OD, wall and conditioning as per drawing |
| Datums | Drawing datum scheme and measurement reference |
| Key dimensions | Feature positions, depths, pitch and diameters reviewed before quotation |
| Thread / profile | Standard or custom profile, class, depth, engagement and gage method |
| Other features | Holes, slots, steps, chamfers, cuts and marking |
| Acceptance | Tolerances, sampling, gages, FAI and inspection report |
| Order | Prototype and production quantity, packaging and delivery target |
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
Diamond-coated tools for clean edges; CNC turning, grinding and drilling to drawing. Dimensional stability excellent with controlled moisture content. Review feature depth, edge distance and remaining wall against critical geometries. Capability is confirmed on your drawing, not from a blanket 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
Ceramic-Filled Epoxy Fiberglass Tubes
Related insulation component from the WELLELE catalog.
Filament-Wound Epoxy Tubing
Related insulation component from the WELLELE catalog.
Synthetic Arc-Quenching Fuse Tubes
Related insulation component from the WELLELE catalog.
Common questions
What voltage class can epoxy glass handle?
Dielectric strength ≥ 20 kV/mm. Voltage rating depends on thickness, geometry and safety factor — your drawing determines the insulation level.
Can epoxy glass be machined to tight tolerances?
Yes. We hold ±0.05 mm on ID/OD with CNC turning and grinding using diamond-coated tools to avoid delamination.
Is epoxy glass arc-resistant?
It has good arc resistance but is not arc-quenching. For direct arc contact, pair with ceramic-filled or synthetic arc-quenching composites.
What certifications do you provide?
Material COA, batch traceability, first-article and final inspection per your plan. Certificates comply with RoHS and REACH on request.
Epoxy glass enough for current-limiting?
Material COA, batch traceability, first-article and final inspection per your plan. Certificates comply with RoHS and REACH on request.
Engineering Guides & Selection Notes
Related technical articles that help specify this product.
Get pricing for Current-Limiting Fuse Tubes in Epoxy Glass
Attach the drawing with annual volume. We check the material against your duty and tolerance, verify ID / OD / wall / features, and respond with manufacturability notes and pricing.