Live-tank circuit breaker 3AP4, 800 kV, FI arrangement (one pole per separate base), four interrupter units per pole, up to 63 kA / 5,000 A, BIL 2,100 kV, FA stored-energy spring mechanism
3AP4-800
- 800 kV extension of the modular 3AP live-tank platform: four self-compression interrupter units per pole, FI arrangement with one pole per separate base (manufacturer catalog 2022; hierarchy family 3AP4FI-800kV)
- Documented US-market 800 kV class ratings: up to 63 kA rated breaking current, up to 5,000 A continuous, lightning impulse withstand 2,100 kV, power-frequency withstand 1,150 kV
- FA spring-spring (stored-energy spring) operating mechanism — the same scalable, inherently maintenance-free drive concept applied across the Siemens Energy breaker portfolio from 15 kV to 800+ kV
- 3AP arc-assist self-blast interrupter: puffer action covers low-current switching, arc-heated self-blast pressure extinguishes high-current faults with substantially less mechanism energy than puffer-only designs
- Deliverable with closing resistors on request — that configuration is designated 3AP5; units rated 245 kV and above ship in sub-assemblies to optimize installation time
800 kV EHV transmission substationsPower transformer switching and protectionRetrofit replacement of existing fault-interruption devicesSpace-constrained outdoor bays requiring 2- or 3-cycle interruption
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3AP4-800 covers up to 800 kV of the circuit breakers range (≤ 800 kV across the category, √ scale).
Specifications
Main
| Type designation | 3AP4 — 3AP live-tank platform, four interrupter units per pole for voltage levels above 550 kV; with closing resistors on request = 3AP5 (manufacturer catalog, 2022) |
| Design | Live-tank circuit breaker, 4 interrupter units per pole |
| Pole arrangement | FI — one pole per separate base (hierarchy family 3AP4FI-800kV) |
| Operating mechanism | FA spring-spring (stored-energy spring) mechanism; scalable design applied from 15 kV to 800+ kV, inherently maintenance-free |
| Arc-quenching medium | SF6, 3AP arc-assist self-blast interrupter units |
| Closing resistors | Deliverable with closing resistors on request — designated 3AP5 |
| Installation | Outdoor |
Electrical — 800 kV class, 3AP 4/5 (US live-tank brochure, 2021)
| Rated maximum voltage | 800 kV |
| Rated continuous current | up to 5,000 A |
| Rated breaking current | up to 63 kA |
| Lightning impulse withstand voltage (BIL) | 2,100 kV |
| Power-frequency withstand voltage | 1,150 kV |
Standards & lifecycle
| Type testing | Every circuit breaker tested to ANSI and IEC standards (US brochure) |
| Delivery | Live-tank units rated 245 kV and above ship in sub-assemblies engineered to optimize installation time and cost (US brochure) |
Electrical — IEC platform ratings, 3AP4/5 800 kV (2022 catalog, current online edition)
| Rated voltage | 800 kV |
| No. of interrupter units per pole | 4 |
| Rated short-duration power-frequency withstand voltage | 830 kV |
| Rated lightning impulse withstand voltage | 2,100 kV |
| Rated switching impulse withstand voltage | 1,425 kV |
| Rated normal current | up to 5,000 A |
| Rated short-time withstand current (1 s – 3 s) | up to 63 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 |
Documents & downloads
Brochure High Voltage Dead Tank Circuit Breakers — US Catalog (includes live-tank 3AP 4/5 ratings up to 800 kV)
Catalog High-Voltage Circuit Breakers — from 72.5 kV up to 1100 kV (Siemens Energy, 2022) (current online edition)
Manual Operational manual, 3AP4 800 kV — available on request
Ordered designations
Representative orderable type designations of this family — searchable via the catalog search.
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