SEP Series Busbar Insulator — Willele
Heavy-duty busbar insulators for LV/MV switchboards, inverters, ESS DC buses and control panels.
Compression-molded BMC/SMC body with plated brass/steel inserts for durable insulation and firm support.
Wide range of heights and thread sizes; customization available for color, insert material and compound grade.
Introduction to SEP Series Busbar Insulators
Willele SEP Series busbar insulators hold copper or aluminum busbars firmly in place while electrically isolating live conductors from the enclosure and adjacent phases. The standardized SEP footprint provides familiar heights and thread sizes so panel builders can streamline layouts and spare parts.
Each unit combines a compression-molded BMC/SMC body with a plated metal insert. The structure delivers repeatable tightening torque, clean creepage paths, and dimensional stability through thermal cycling and vibration—ideal for low- to medium-voltage assemblies where reliability and serviceability matter.
Function and Purpose of Willele SEP Insulators
Electrical insulation: the molded body acts as a non-conductive barrier that reduces phase-to-phase faults and arcing. Mechanical support: the metal insert and core geometry provide a rigid mounting point so busbars remain aligned during vibration and short-circuit forces.
Willele SEP Series Overview
Higher-Strength Selections
For demanding loads or stacked busbars, choose models with higher tensile and torque margins. Material and insert customization are available to meet project directives.
General-Purpose Selections
Balanced options for compact layouts in LV switchboards, compact inverters and control cabinets where footprint and repeatable fastening are critical.
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) | HEIGHT (mm) |
|---|---|---|---|---|---|---|
| SEP 1615 | 300 | 4 | 3 | 4 | 4 | 15 |
| SEP 2019 | 400 | 7 | 6 | 5 | 6 | 19 |
| SEP 2519 | 400 | 8.5 | 6 | 5 | 6 | 19 |
| SEP 2522 | 500 | 8.5 | 6 | 4 | 7 | 22 |
| SEP 2525 | 550 | 8.5 | 8 | 8 | 9 | 25 |
| SEP 3030 | 600 | 11 | 10 | 6 | 9 | 30 |
| SEP 3040 | 700 | 11 | 30 | 8 | 9 | 40 |
| SEP 3540 | 700 | 12.5 | 25 | 8 | 10 | 40 |
| SEP 3541 | 700 | 12.5 | 25 | 6 | 10 | 41 |
| SEP 1615-H | 650 | 10 | 12.5 | 8 | 9 | 15 |
| SEP 60 | 1200 | 20 | 35 | 10 | 15 | 60 |
| SEP 76 | 1500 | 25 | 40 | 10 | 20 | 76 |
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 color. Custom heights, colors, and material grades available to order.
Applications
- Switchboards, MCCs, capacitor banks
- Solar/ESS inverters and DC bus assemblies
- Industrial drives, rectifier cabinets, control panels
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., SEP 3030) 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 SEP Series combines reliable electrical insulation with rigid mechanical support for modern LV/MV distribution. Share your busbar plan and we will recommend the right model and mounting details for your build.
