3AP2 FI-420
Live-tank circuit breaker 3AP2 FI, 420 kV, up to 63 kA / 4,000 A, two interrupter units per pole, spring drive
3AP2 FI-420
- Two self-compression interrupter units per pole on the modular 3AP platform (3AP2 FI covers up to 550 kV)
- FI arrangement: separate base frame and stored-energy spring mechanism per pole (3 mechanisms, 3 base frames) for single- and three-pole auto-reclosing, rated sequence O-0.3s-CO-3min-CO
- Type-tested to IEC 62271-100; documented 420 kV variants at 4,000 A with 50 kA (125 kA peak making) and 63 kA (158 kAp making)
- Insulation coordination for 420 kV: 1,425 kVp lightning impulse, 1,050 kVp switching impulse, 520/610 kV power-frequency withstand, 31 mm/kV creepage
- Outdoor design; IP55 powder-coated aluminium control cubicle and 110 V DC or 220 V DC control variants (project datasheets)
420 kV transmission substationsOverhead line switching with single- and three-pole auto-reclosingCapacitive line and cable switching
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3AP2 FI-420 covers up to 420 kV of the circuit breakers range (≤ 800 kV across the category, √ scale).
Specifications
Main
| Type designation | 3AP2FI (420 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, rated pressure 6.0 bar rel. at 20 °C (alarm 5.2, lockout 5.0 bar rel.) |
| Installation | Outdoor |
| Auto-reclosing | Single- and three-pole (1/3 phases) |
Electrical
| Rated voltage | 420 kV (service voltage 400 kV) |
| Rated frequency | 50 Hz (both cited datasheets) |
| Rated normal current | 4,000 A (documented datasheets; project orders under the same SAP materials range 2,000–5,000 A) |
| Rated short-circuit breaking current | 50 kA or 63 kA (3 s) in the documented datasheets; SAP order history also shows 40 kA and 80 kA project variants |
| Rated short-circuit making current | 125 kA peak (50 kA version) / 158 kAp (63 kA version) |
| Power-frequency withstand | 520 kV to earth / 610 kV across open breaker |
| Lightning impulse withstand | 1,425 kVp to earth and across open breaker (63 kA sheet: 1,425 (+240) kVp across) |
| Switching impulse withstand | 1,050 kVp to earth |
| Rated operating sequence | O-0.3s-CO-3min-CO; first-pole-to-clear factor 1.3 |
| Capacitive current switching | Line 600 A / cable 400 A at voltage factor 1.4 p.u. (50 kA datasheet) |
Mechanical / environment
| Operating times | 50 kA sheet: opening <30 ms, closing <80 ms, rated break time 45 ms · 63 kA sheet: opening 24 ±4 ms, closing 72 ±8 ms, breaking ≤60 ms |
| Ambient temperature range | -30 to +45 °C (50 kA datasheet) / -10 to +40 °C (63 kA project variant); project-dependent |
| Creepage distance | 31 mm/kV (13,020 mm to earth and across open breaker) |
| SF6 gas quantity | approx. 39 kg per breaker (63 kA configuration, with rupture disk) |
| Weight without support structure | approx. 4,400 kg (63 kA configuration) |
| SF6 loss rate | ≤ 0.5 % per year |
| Control voltage variants | 110 V DC or 220 V DC; heating 230 V AC |
| Control cubicle | IP55, powder-coated aluminium (project-specific configuration) |
Standards & certifications
| Product standard | IEC 62271-100 (high-voltage AC circuit breakers) |
| Type testing | Type-tested in accordance with IEC and ANSI standards (manufacturer catalog) |
| Routine testing | Factory routine-tested; lead-factory lab accredited according to IEC 17025, PEHLA network, STL member lab |
Electrical — IEC platform ratings, 3AP2/3 420 kV (2022 catalog, current online edition)
| Rated voltage | 420 kV |
| No. of interrupter units per pole | 2 |
| Rated short-duration power-frequency withstand voltage | 610 kV |
| Rated lightning impulse withstand voltage | 1,425 kV |
| Rated switching impulse withstand voltage | 1,050 kV |
| Rated normal current | up to 5,000 A |
| Rated short-time withstand current (1 s – 3 s) | up to 80 kA |
| Rated break time | 2 cycles |
| Rated operating sequence | O-0.3 s-CO-3 min-CO or CO-15 s-CO |
| Rated frequency | 50 or 60 Hz |
| Temperature range | −60 up to +55 °C (catalog footnote: limited normal-current rating at more than +40 °C) |
| Maintenance after | 25 years |
Options & variants
Counts verified against SAP E3501 (VBAP/VBAK, orders 2017-06 to 2026-06; 'since 2015' is the query window). Descriptions are the SAP material texts — the -1/-2 suffixes are order-configuration codes, not decoded product roles (an earlier 'complete breaker / master pole' reading was unsupported: 1 of 206 lines). Order-line texts under these materials span 2,000–5,000 A and 40–80 kA project configurations. The 63 kA KMAT nature of 3AP2FI-2S is stated verbatim in its SAP material description. Control-voltage variants (110 / 220 V DC) exist as separate datasheets for all configurations.
| SAP material | SAP description | Order lines since 2015 |
|---|---|---|
| 3AP2FI-1-420KV | 3AP Live Tank FI-1-420 kV | 342 |
| 3AP2FI-2-420KV | 3AP Live Tank FI-2-420 kV | 206 |
| 3AP2FI-2S | KMAT (configurable) 3AP2FI-2S-420kV / 63 kA | 22 |
Documents & downloads
Datasheet Technical Data 3AP2FI 420 kV, 63 kA / 4,000 A (project design instructions)
Catalog High-Voltage Circuit Breakers 72.5 kV to 1100 kV (Siemens Energy, 2022) (current online edition)
Manual Standard Operational Manual 3AP2 420 kV
Ordered designations
Representative orderable type designations of this family — searchable via the catalog search.
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