3FL8
Composite long-rod insulator 3FL8
3FL8
- One-piece HTV silicone rubber housing, direct-injection molded onto the rod — prevents partial discharges
- Boron-free ECR glass FRP core rod, brittle-fracture resistant, hydrolysis- and acid-resistant
- HTV silicone with hydrophobicity transfer mechanism for highest pollution performance
- Non-overmoulded housing per 3FL8 drawings — corresponds to family sealing system B: gap between housing and end fitting sealed with elastic silicone gel, triple point fully encapsulated (100–630 kN)
- Forged steel end fittings per IEC 61466-1 / ANSI C29.2; integrated grading ring reduces electrical field stress
Overhead transmission line suspension stringsOverhead transmission line tension stringsHigh-pollution area outdoor insulationLine surge arrester assemblies
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3FL8 covers 72.5–800 kV of the long-rod & station post range (≤ 800 kV across the category, √ scale).
Specifications
Main
| Product type | Composite long-rod insulator, Siemens Energy 3FL8 (order code pattern 3FL8___-x__61-1XX9) |
| Application | Suspension and tension, overhead transmission lines |
| Housing | One-piece HTV silicone rubber, direct injection molding over the rod |
| Sealing | Housing drawings state "non-overmoulded" — corresponds to family sealing system B (100–630 kN): triple point fully encapsulated, gap between housing and end fitting sealed with elastic silicone gel |
| Options | Available in combination with line hardware and line surge arresters |
Electrical
| Voltage class Um | 72.5 – 800 kV (3FL family range; per-type rating by order code) |
| Creepage factor (CF) | 2.8 / 3.5 / 4.5 — three alternate-shed housing profiles |
| Field grading | Integrated grading ring reduces electrical field stress |
| Partial discharges | Prevented by direct-injection silicone molding process |
Mechanical & environment
| Mechanical class (SML) | 70 – 630 kN across the 3FL family; exact per-type SML by order code (not stated in available 3FL8 documents) |
| Core | ECR glass (boron-free) FRP rod, brittle-fracture resistant, hydrolysis- and acid-resistant |
| Housing geometry | Ø40 mm housing over rod; alternating sheds at 25 mm spacing (50 mm pitch per shed size), 4 mm shed edge; shed pairs Ø109/79, Ø126/96 or Ø152/122 mm depending on profile |
| End fittings | Forged steel, to IEC 61466-1 and ANSI C29.2 |
| Pollution performance | HTV silicone with hydrophobicity transfer mechanism |
Standards & certifications
| Design & testing | IEC 61109, ANSI C29.11, ANSI C29.12, CSA C411.4-16 (latest versions) |
| End fittings | IEC 61466-1, ANSI C29.2 |
Options & variants
Housing profiles from Siemens Energy 3FL8 housing drawings (492-00008 / -00018 / -00028). All profiles use alternating sheds at 25 mm spacing, 4 mm shed edge. Overall length, creepage distance and SML are order-code specific.
| Housing version (drawing no.) | Order code pattern | Creepage factor | Shed diameters | Housing Ø over rod | Note |
|---|---|---|---|---|---|
| 492-00008 | 3FL8___-2__61-1XX9 | 2.8 | Ø109 / Ø79 mm | Ø40 mm | Non-overmoulded |
| 492-00018 | 3FL8___-3__61-1XX9 | 3.5 | Ø126 / Ø96 mm | Ø40 mm | Non-overmoulded |
| 492-00028 | 3FL8___-4__61-1XX9 | 4.5 | Ø152 / Ø122 mm | Ø40 mm | Non-overmoulded; mould not available / not tested per drawing |
Documents & downloads
Flyer 3FL long rod insulators — composite technology up to 800 kV
Drawing 3FL8 housing profile CF 2.8 (drawing 492-00008)
Drawing 3FL8 housing profile CF 3.5 (drawing 492-00018)
Drawing 3FL8 housing profile CF 4.5 (drawing 492-00028)
Also covered in the technical library
Flyer 3FL Long Rod Insulators — Composite Technology up to 800 kV
Catalog 3FL Silicone Long Rod Insulators for Overhead Power Lines
Brochure Our portfolio of surge arresters & composite insulators — Siemens Energy
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