Ceramic-Filled Epoxy Fiberglass Tubes for MV/HV Fuse Bodies
Arc-resistant, high-track-resistance tubes for current-limiting and HV fuse links. Ceramic-filled epoxy glass combines the arc containment of ceramic with the machinability of epoxy glass. It is specified where the fuse must survive high clearing energy without tracking or wall blowout. This is a material system, not a single part number. Give us the voltage class, clearing energy, wall and dimens
Arc-resistant, high-track-resistance tubes for current-limiting and HV fuse links. Ceramic-filled epoxy glass combines the arc containment of ceramic with the machinability of epoxy glass. It is specified where the fuse must survive high clearing energy without tracking or wall blowout. This is a material system, not a single part number. Give us the voltage class, clearing energy, wall and dimens
Technical specifications
| Material | Epoxy glass + ceramic filler |
| Service temperature | Up to ~180 degC class |
| Track resistance | High (CTI rated, arc-quenching) |
| Voltage class | MV / HV per drawing |
| Form | Filament-wound or molded tube |
💾 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
- MV/HV fuse body bores needing arc erosion resistance
- Current-limiting fuse barrels for class-limited break duty
- Switchgear insulating tubes with ceramic loading
- Transformer primary fuse bodies
- Capacitor discharge fuse links with thermal margin
- Fuse tubes where arc products must not track the wall
Why ceramic-filled epoxy fiberglass for this application
Ceramic filler raises the arc-erosion and thermal budget of the epoxy-glass wall, giving a fuse bore that survives repeated clearing without carbon tracking along the surface.
Heavier and more brittle than standard G10 — drop/impact care in transit. Confirm ceramic loading versus your CTI and arc requirements; not universally arc-proof.
Standards: IEC 60282-1, ASTM D709, UL 248.
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
Synthetic Arc-Quenching Fuse Tubes
Related insulation component from the WELLELE catalog.
Medium & High Voltage Fuse Link Bodies
Related insulation component from the WELLELE catalog.
Filament-Wound Epoxy Tubing
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.
Is ceramic epoxy fiberglass a drop-in for porcelain?
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 Ceramic-Filled Epoxy Fiberglass Tubes for MV/HV Fuse Bodies
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.