EP 1721-1 Flexible Epoxy Potting Compound | Structural-Grade Solution for Three-Phase Busbar Sealing and Potting

With accelerated adoption of 800V high‑voltage platforms and 3‑in‑1 e‑Axle drive systems, operating conditions for internal three‑phase busbars within electric drives have become significantly more demanding. For three‑phase busbars, connection terminals and high‑voltage connectors, potting materials are required not only to deliver insulation and sealing, but also to withstand hundreds of amperes of high current, high‑temperature oil media, long‑term vibration and shock, as well as thermal expansion mismatch between busbars and housing structures. Accordingly, selecting potting compounds for three‑phase busbars in 800V electric drives should focus not merely on hardness and bonding strength, but on the balanced combination of material modulus, flexibility, resistance to high‑temperature oil aging, interfacial adhesion and long‑term mechanical reliability. To address structural fixation and sealing requirements of three‑phase busbars and connection terminals in electric drives, ELAPLUS has developed EP 1721‑1 Flexible Epoxy Potting Compound. By balancing low modulus, high elongation and the adhesive performance of epoxy systems, it mitigates risks of stress concentration at busbar roots under thermal cycling and vibration. 01 Why 800V Electric Drive Three‑Phase Busbars Impose Higher Requirements on Potting Compounds Busbars in traditional electrical systems primarily function for current transmission and connection fixation. In the era of 800V electric drives, three‑phase busbars have evolved from simple wiring components into critical connection structures operating within complex environments. Especially within 3‑in‑1 e‑Axle assemblies, reduction gearboxes and oil‑cooled motor structures, busbars and their connection points are continuously exposed to: If potting materials with excessively high modulus and rigid properties are adopted, asynchronous thermal expansion and contraction between busbars and housings will concentrate stress at busbar roots or adhesive interfaces. After prolonged cycling, the following failures may occur:Adhesive cracking｜Interfacial delamination｜Busbar loosening｜Degraded sealing｜Reduced insulation reliability This explains why potting for electric drive busbars cannot simply follow the idea of “harder means stronger”. 02 EP 1721‑1: Relieve Interfacial…