C Series Busbar Insulator — Willele
Heavy-duty cylindrical busbar insulators for LV/MV switchboards, rectifiers, drives, ESS/DC buses and control panels.
Compression-molded BMC/SMC body with plated brass/steel inserts for dependable insulation and rigid support.
Multiple heights and thread sizes; customization for color, insert material and compound grade.
Introduction to C Series Busbar Insulators
Willele C Series busbar insulators provide rigid mechanical support and reliable electrical isolation for copper or aluminum busbars. The compact cylindrical form fits dense layouts and stacked bars, helping panel builders standardize heights and screw sizes while keeping clear creepage paths.
Each unit combines a compression-molded BMC/SMC body with a plated metal insert. This structure delivers repeatable tightening torque, dimensional stability under vibration/thermal cycling, and long-term serviceability in low- to medium-voltage equipment.
Function and Purpose of Willele C Insulators
Electrical insulation: the molded body forms a non-conductive barrier that reduces phase-to-phase faults and arcing. Mechanical support: the threaded insert and core geometry create a rigid mounting point so busbars remain aligned during vibration and short-circuit forces.
Willele C Series Overview
Key Features
- High-quality BMC/SMC construction for durability and strength
- Operating temperature range: −40 °C to +140 °C (compound dependent)
- Brass or steel threaded inserts with protective plating for corrosion resistance
- Customizable color, insert type and material grade to match project needs
- Built to international practices for consistent performance
Typical Uses
LV/MV switchgear, MCCs, rectifier & inverter cabinets, ESS/DC bus assemblies, transformer connections and industrial control panels.
Key Specifications and Technical Parameters
Typical values below. Confirm final ratings and tolerances with Willele before design-in.
| MODEL | TENSILE (LBS) | WITHSTAND (kV) | TORQUE (ft-lbs) | SCREW (mm) | SCREW DEPTH (mm) |
|---|---|---|---|---|---|
| C25 | 500 | 6 | 6 | 6 | 9 |
| C30 | 500 | 8 | 8 | 6 | 9 |
| C40 | 650 | 12 | 12 | 6 | 12 |
| C50 | 1000 | 15 | 20 | 8 | 12 |
| C60 | 1200 | 20 | 40 | 10 | 15 |
| C70 | 1500 | 22 | 40 | 10 | 15 |
Dimensions and Size Chart
Electrical and Mechanical Parameters
Electrical
Select a model whose dielectric withstand comfortably exceeds operating level and expected transients. Verify creepage and clearance in your cabinet layout.
- Typical operating range: −40 °C to +140 °C (material dependent)
- Stable insulation under thermal cycling and vibration
- Outdoor-grade compounds available on request
Mechanical
Threaded inserts enable repeatable torque during assembly and service. The solid core resists compression and provides durable clamping for straight or stacked busbars.
- Check tensile/torque margin against worst-case short-circuit forces
- Match screw size and thread depth to clamps/base plate
- Optional color coding and height variants for phase ID and layout constraints
Material Composition and Properties
BMC/SMC Body
Compression-molded with fiberglass reinforcement to achieve high dielectric strength and dimensional stability.
Metal Inserts
Brass for corrosion resistance and conductivity; steel for higher thread strength—both with protective plating.
Finish & Options
Standard red or black. Custom heights, colors and material grades available to order.
Selection Guide
- Voltage class: choose a model whose kV withstand exceeds operating voltage plus transients.
- Mechanical load: use busbar mass, spacing and fault levels to select tensile/torque ratings with margin.
- Mounting details: confirm screw size and thread depth; check clamp/washer geometry.
- Environment: specify material grade for temperature, UV or humidity.
Installation & Handling
- Mount on clean, flat surfaces; remove burrs and debris before assembly.
- Align bars so forces are axial to the insert; avoid prying loads.
- Tighten to the torque listed for the specific model and screw size.
- Re-check torque after the first thermal cycle if required by maintenance policy.
Quality & Certifications
Manufactured under documented procedures with incoming material checks and dimensional inspection. RoHS/REACH statements and third-party reports can be supplied for the exact model you purchase.
Ordering Information
For a fast quotation and drawing release, please provide: model (e.g., C50) or target height/thread/depth, insert material (brass/steel) and finish, quantity & destination, and any certification/inspection needs. Optional: color, special compound, packaging.
Conclusion
Willele C Series combines dependable insulation with rigid mechanical support for modern LV/MV power distribution. Share your busbar plan and we will recommend the right model and mounting details for your build.
