Composite long-rod insulator 3FL7, load class ≤ 300 kN, 3FL composite platform (family Um 72.5 – 800 kV), one-piece HTV silicone housing on ECR FRP rod, suspension & tension
3FL7
- Load class ≤ 300 kN per the official product hierarchy (Tension and Suspension Insulators 3FL) — above the 210 kN limit of family sealing system A, which per the family flyer places it in the sealing system B range (100 – 630 kN, triple point fully encapsulated with elastic silicone gel)
- One-piece HTV silicone rubber housing, direct-injection molded — prevents partial discharges and provides hydrophobicity transfer for highest pollution performance
- Boron-free ECR glass FRP core rod — brittle-fracture resistant, hydrolysis- and acid-resistant
- Forged-steel end fittings per IEC 61466-1 and ANSI C29.2; integrated grading ring reduces electrical field stress
- Family designed and tested to the latest IEC 61109, ANSI C29.11, ANSI C29.12 and CSA C411.4-16; also available combined with line hardware and line surge arresters — per-type ratings, lengths and creepage on request
Overhead transmission line tension strings with high mechanical loadsOverhead transmission line suspension stringsHigh-pollution area outdoor insulationLine surge arrester assemblies
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3FL7 covers 72.5–800 kV of the long-rod & station post range (≤ 800 kV across the category, √ scale).
Specifications
Main
| Product family | 3FL7 |
| Product type | Composite (silicone) long-rod insulator |
| Application | Suspension and tension on overhead lines (3FL family) |
| Housing | One-piece HTV silicone rubber, direct injection molding onto the rod (family design) |
| Hierarchy load class | 3FL7 insulators ≤ 300 kN (official product hierarchy) |
Family ratings (3FL platform — per-type 3FL7 values on request)
| Mechanical class (SML), family | 70 – 630 kN across the 3FL family; 3FL7 hierarchy class ≤ 300 kN — exact per-type SML by order code |
| Voltage class (Um), family | 72.5 – 800 kV (3FL family range) |
| Sealing system | Above 210 kN only family sealing system B applies per the flyer's stated ranges: triple point fully encapsulated, gap between housing and end fitting sealed with elastic silicone gel (100 – 630 kN) |
| Core | ECR glass (boron-free) FRP rod — brittle-fracture resistant, hydrolysis- and acid-resistant |
| End fittings | Forged steel per IEC 61466-1 and ANSI C29.2 |
| Field control | Integrated grading ring reduces electrical field stress |
Standards & certifications
| Design & testing | IEC 61109, ANSI C29.11, ANSI C29.12, CSA C411.4-16 (latest versions, family-wide) |
| End fittings | IEC 61466-1, ANSI C29.2 |
Documents & downloads
Flyer 3FL long rod insulators — Composite technology up to 800 kV
Datasheet 3FL7 type-specific technical data (ratings, lengths, creepage) — available on request
Brochure Our portfolio of surge arresters & composite insulators — overhead line solutions incl. 3FL composite insulators up to 800 kV (current online edition)
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