71 Series Busbar Insulator — Willele
Compact drum-profile insulators for dense LV/MV cabinets, MCCs and DC bus assemblies.
BMC/SMC compression-molded body with plated brass/steel inserts for stable clamping and insulation.
Models from Ø33–Ø54 mm with multiple thread options (M6–M12); custom colors and compounds on request.
Introduction to 71 Series Busbar Insulators
Willele 71 Series busbar insulators use a compact drum geometry that saves cabinet space while delivering dependable electrical isolation and rigid support for copper or aluminum busbars. The range is widely used in switchgear, MCCs, rectifier/inverter cabinets and ESS/DC bus systems.
Each unit is compression-molded from BMC/SMC with a plated metal insert, providing repeatable tightening torque and dimensional stability under vibration and thermal cycling.
Function and Purpose
Electrical insulation. The molded body acts as a non-conductive barrier reducing phase-to-phase faults and arcing. Mechanical support. The threaded insert forms a rigid mounting point so busbars remain aligned during vibration and short-circuit forces.
Willele 71 Series Overview
Key Features
- Compression-molded BMC/SMC body for mechanical strength and dielectric stability
- Typical operating range: −40 °C to +140 °C (compound dependent)
- Plated brass or steel threaded inserts for high pull-out strength and corrosion resistance
- Compact drum profile fits stacked bars and tight clearances
- Customization for color, insert type, thread, height and compound grade
Typical Applications
LV/MV switchgear, MCCs, rectifier & inverter cabinets, ESS/DC bus assemblies, transformer connections and industrial control panels.
Specifications
| MODEL | DIAMETER (mm) | HEIGHT (mm) | SCREW | ORDER No. | INSTALLATION SIZE |
|---|---|---|---|---|---|
| 71-7100×35 | Ø33 | 35 | M6 | 170395 | Refer to diagram |
| 71-7105×38 | Ø33 | 38 | M6 | 170396 | Refer to diagram |
| 71-7105×38 | Ø33 | 38 | M8 | 170397 | Refer to diagram |
| 71-7110×45 | Ø42 | 45 | M8 | 170398 | Refer to diagram |
| 71-7110×45 | Ø42 | 45 | M10 | 170399 | Refer to diagram |
| 71-7120×50 | Ø46 | 50 | M8, M10 | 170400 | Refer to diagram |
| 71-7120×52 | Ø52 | 52 | M10 | 170401 | Refer to diagram |
| 71-7120×60 | Ø54 | 60 | M10, M12 | 170402 | Refer to diagram |
Dimensions and Size Chart
Electrical and Mechanical Notes
Electrical
- Choose a model whose dielectric withstand comfortably exceeds your operating level and expected transients.
- Verify creepage and clearance distances in the cabinet layout.
- Outdoor-grade compounds available on request.
Mechanical
- Match thread size and depth to clamps and base plates.
- Apply the recommended tightening torque; re-check after initial thermal cycle if required.
- Align bars so forces are axial to the insert; avoid prying loads on the shoulder.
Ordering Information
For a quick quotation and drawing, please provide: model and size (e.g., 71-7110×45, M10), insert material (brass/steel), quantity & destination, and any certification/inspection needs. Optional: color, special compound, packaging.
