Composite post insulator 3FT6, HTV silicone housing, 120 mm ECR core, SCL 78 kNm, 0.5 – 5.5 m, AC/DC
3FT6
- 120 mm (4.7") core-diameter class of the 3FT family (3FT2 – 3FT7, SCL 18 – 150 kNm), for station post and line post applications on both AC and DC systems
- Only 3FT type listed with both shed-profile variants in the type overview: 3FT6-3 (creepage factor 3.5) and 3FT6-4 (creepage factor 4.2), per IEC 60815-3 (AC) / IEC 60815-4 (DC)
- HTV silicone housing applied by multi-shot injection molding on an ECR fiberglass core; overmolded end fittings seal the triple point against moisture ingress
- Lightning withstand > 3050 kV at maximum length; single-unit length 0.5 – 5.5 m in 12.5 mm increments, stackable; flange end fittings: tapped 8x M16 D127, through-holes 8x D24 D225
- Designed and tested to IEC 61952 / IEC 62231 and ANSI C29.17 / C29.19; optional Factory Acceptance Tests (FAT) in Asia and Europe
Busbar support in HV substationsSupport insulator below HV equipmentInclined and braced line postJumper supportInterface and interline spacersComposite insulator crossarm (CICA)
Sign in to see your price, availability and framework terms for 3FT6.
Horizon-3 pattern: this exact page gains commerce powers on sign-in — the URL never changes.
SIMULATED · ASK-AN-EXPERT PILOT DEMO
Ask an expert about 3FT6
15 minutes with the right arresters & insulators specialist — question in, booked call out. No email archaeology.
Checking availability…
Specifications
Main
| Product family | 3FT6 |
| Product type | Composite post insulator (station post / line post) |
| Series | 3FT composite post insulators, core classes 3FT2 – 3FT7 |
| Current type | AC and DC |
Ratings
| Core diameter | 120 mm (4.7") |
| Specified Mechanical Load (SCL) | 78 kNm (equivalent to ceramic breaking load) |
| Maximum Design Cantilever Load (MDCL) | 39 kNm |
| Length | 0.5 – 5.5 m single unit, in 12.5 mm increments; stackable |
| Lightning withstand | > 3050 kV |
| Creepage factor (creepage/arcing) | 3.5 (3FT6-3) or 4.2 (3FT6-4) |
| System voltage validation | 3FT family validated by electrical-field simulations up to 800 kV system voltage; larger corona rings required at higher system voltages |
Mechanical & environment
| Housing | HTV silicone rubber, multi-shot injection molded — aging-resistant, hydrophobic, UV-resistant |
| Core | ECR fiberglass rod (electrical and corrosion resistant) |
| End fittings | Tapped flange 8x M16 D127 · through-holes flange 8x D24 D225 |
| Adhesion system | Extensively tested primer system bonding silicone housing, fiberglass rod and end fittings, with continuous monitoring and strict quality control in production |
Standards & certifications
| Line post | IEC 61952 · ANSI C29.17 |
| Station post | IEC 62231 · ANSI C29.19 |
| Shed profile | IEC 60815-3 (AC) · IEC 60815-4 (DC) |
| Testing | Fully tested to IEC and ANSI standards; optional Factory Acceptance Test (FAT) in Asia and Europe |
Documents & downloads
Flyer 3FT composite post insulators — Engineered for extreme performance
Datasheet 3FT6 type-specific datasheet — available on request
Ordered designations
Representative orderable type designations of this family — searchable via the catalog search.
Related products
3FH 
3FL2
Composite hollow-core insulators 3FH — apparatus housings for breakers, bushings and instrument transformers; detailed ratings on request
Apparatus housings · Composite hollow-core · Ratings on request Datasheet · Dimensions ↓ 3FL-HVDCHVDC converter tension insulators, 3FL composite long-rod platform, one-piece HTV silicone housing on ECR glass FRP rod
HVDC converter tension duty · 3FL composite long-rod platform · Silicone housing Datasheet · Dimensions ↓ 3FL2