Live-tank circuit breaker 3AP2 FI, 550 kV, up to 63 kA / 5,000 A, two interrupter units per pole, spring drive
3AP2 FI-550
- Two self-compression interrupter units per pole; 550 kV is the top rating of the 3AP2/3 live-tank range on the modular 3AP platform (72.5–1100 kV)
- FI arrangement: separate base frame and stored-energy spring mechanism per pole for single- and three-pole auto-reclosing; rated sequence O-0.3 s-CO-3 min-CO or CO-15 s-CO
- Insulation coordination for 550 kV (IEC): 800 kV power-frequency, 1,550 kVp lightning-impulse, 1,175 kVp switching-impulse withstand; ANSI variant 3AP-550 rated 860 kV / 1,800 kV BIL
- Temperature range −60 up to +55 °C, 50 or 60 Hz, first scheduled maintenance after 25 years (platform table); optional closing resistors available as 3AP3 for 362–550 kV
- Type-tested to latest IEC and ANSI standards; a high-seismic special design of the 550 kV FI class is shown in the catalog portfolio
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3AP2 FI-550 covers up to 550 kV of the circuit breakers range (≤ 800 kV across the category, √ scale).
Specifications
Main
| Type designation | 3AP2FI (550 kV); with closing resistors: 3AP3 FI 550 kV |
| Design | Live-tank circuit breaker, 2 interrupter units per pole |
| Pole arrangement | 3 poles on separate base frames (FI), 1 operating mechanism per pole |
| Operating mechanism | Stored-energy spring mechanism |
| Arc-quenching medium | SF6, self-compression interrupter units |
| Installation | Outdoor |
| Auto-reclosing | Single- and three-pole (single-pole operation via separate FI bases) |
Electrical
| Rated voltage | 550 kV (top rating of the 3AP2/3 live-tank range; US/ANSI design 500 kV nominal / 550 kV maximum) |
| Rated frequency | 50 or 60 Hz |
| Rated normal current | Up to 5,000 A (US brochure lists 1,200–5,000 A per model) |
| Rated short-time withstand / breaking current | Up to 63 kA (1 s – 3 s); US models 3AP-550-20/-31.5/-40/-50/-63 span 20–63 kA |
| Power-frequency withstand | 800 kV (IEC platform table) / 860 kV (ANSI 3AP-550) |
| Lightning impulse withstand | 1,550 kVp (IEC) / 1,800 kV BIL (ANSI 3AP-550) |
| Switching impulse withstand | 1,175 kVp (IEC) |
| Rated operating sequence | O-0.3 s-CO-3 min-CO or CO-15 s-CO |
| Rated break time | 2 cycles (2022 catalog online-edition platform table, 550 kV column); US 3AP-550 models likewise listed at 2-cycle interrupting time |
| Closing resistors | Optional for 362–550 kV applications (ordered as 3AP3) |
Mechanical / environment
| Ambient temperature range | −60 up to +55 °C (catalog footnote: limited normal-current rating at more than +40 °C) |
| Maintenance interval | First scheduled maintenance after 25 years (platform table) |
| Transport / site assembly | Ratings above 300 kV are shipped as compact routine-tested subassemblies; one supervisor can install a breaker within about 1.5 days (catalog) |
| Seismic | High-seismic special design of the 550 kV FI class shown in the catalog portfolio (3AP3 FI 550 kV) |
| Interrupter units (US models) | 2 per pole for all 3AP-550 ratings (US brochure ratings table lists the 550 kV column under type 3AP2/3; IEC platform table: 2 interrupter units per pole) |
Standards & certifications
| Product standard | IEC 62271-100 (high-voltage AC circuit breakers); US variants per ANSI/IEEE |
| Type testing | Completely type-tested in accordance with latest IEC, ANSI and other standards before market launch (manufacturer catalog) |
| Routine testing | Factory routine-tested; lead-factory laboratory accredited according to IEC 17025, part of the PEHLA network and member lab of the Short-Circuit Testing Liaison (STL) |
Options & variants
Verified live in Snowflake DB_PRD_LANDING.E3501 (VBAP/VBAK/MAKT, probe script backend/scripts/sap-skills/probe-3ap2fi-550.mjs): material 3AP2FI-550 has 3 order lines between 2022-06 and 2024-03 ('since 2015' is the query window); its English SAP material text is the generic 'Circuit Breaker'. GT_Product_Hierarchy Rev03 lists 3AP2FI-550kV and the closing-resistor variant 3AP3FI-550kV under 'Live Tank up to 550 kV (3AP)'; no 3AP3 550 kV order lines were found in E3501 since 2015. Component materials for the family (e.g. A7B59603865007/9 'Control frame, cpl. 3AP2 FI 550kV') also exist in SAP as spares, confirming the installed base.
| SAP material | SAP description | Order lines since 2015 |
|---|---|---|
| 3AP2FI-550 | Circuit Breaker | 3 |
Documents & downloads
Catalog High-Voltage Circuit Breakers 72.5 kV to 1100 kV (Siemens Energy, 2022) (current online edition)
Catalog Circuit Switchers CPV2/CPV2S and 3AP Live-Tank Breakers up to 550 kV (Siemens Energy US, 2021)
Manual Standard Operational Manual 3AP2 (420 kV edition, same two-interrupter breaker family)
Service Maintenance of AIS 3A Circuit Breakers (Grid Technologies Service)
Ordered designations
Representative orderable type designations of this family — searchable via the catalog search.
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