PV Insert Epoxy Fiberglass Tubes for Terminal Insulators
Insulator inserts for PV and busbar terminal assemblies. PV insert tubes are the insulating core in terminal and busbar connectors. We machine them to the insert drawing with the ID/OD and shoulder the connector needs. Material is epoxy glass for moisture stability; we confirm the temperature and flame class from your application. ECR epoxy glass resists moisture better outdoors. We will specify E
Insulator inserts for PV and busbar terminal assemblies. PV insert tubes are the insulating core in terminal and busbar connectors. We machine them to the insert drawing with the ID/OD and shoulder the connector needs. Material is epoxy glass for moisture stability; we confirm the temperature and flame class from your application. ECR epoxy glass resists moisture better outdoors. We will specify E
Technical specifications
| Material | Epoxy glass (G10/FR-4) |
| Use | PV / busbar terminal inserts |
| Form | Machined insert tube |
| 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) |
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
- PV junction-box and terminal insulator inserts
- Solar combiner box busbar isolation inserts
- Inverter DC-side insulating push-throughs
- PV panel string connector isolation sleeves
- Terminal rail post insulators in solar equipment
- Low-Creepage inserts for rooftop and utility PV
Why epoxy fiberglass for this application
PV DC busbars run ~1000 V+ with tight spacing, so the insert must keep high dielectric strength and low tracking in sun and humidity. Epoxy glass delivers this at compact section sizes.
UV and condensation drive tracking — specify CTI 600+ grade for outdoor boxes. Confirm hole-wall clearance against live busbar creepage.
Standards: IEC 61730 / IEC 61215 (PV), ASTM D709, UL 94 V-0.
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
Shaped HV Casing Parts (FR-4/G10)
Related insulation component from the WELLELE catalog.
G10 / FR-4 Epoxy Glass Washers
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.
Epoxy glass for outdoor PV inserts?
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 PV Insert Epoxy Fiberglass Tubes for Terminal Insulators
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.