3AP1 FI-245
Live-tank circuit breaker 3AP1 FI, 245 kV, 40–50 kA type-tested range, up to 4,000 A, SF6 self-compression, single-pole operation with one spring drive per pole on separate bases
3AP1 FI-245
- FI arrangement: each pole on a separate base with its own stored-energy spring mechanism — sized for single-pole operation and single-pole auto-reclosing duty
- One SF6 self-compression (counter-acting piston) interrupter unit per pole, requiring minimal actuating energy — the 3AP1 design used from 72.5 kV up to 300 kV
- Patented stored-energy spring drive identical across the 3AP family up to 1100 kV, with maintenance-free charging mechanism and roller bearings
- Delivered fully pre-assembled and routine-tested (72.5–300 kV); commissioning without special tools, about 1.5 days with a single supervisor
- Proven fleet: 43,534 3AP1 breakers delivered since serial production began in 1994 (OEM count, 2020); OEM maintenance cycle M1 visual check at 12 years / M3 revision at 25 years
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3AP1 FI-245 covers up to 245 kV of the circuit breakers range (≤ 800 kV across the category, √ scale).
Specifications
Main
| Type designation | 3AP1 FI (245 kV) |
| Design | Live-tank, air-insulated (AIS), outdoor |
| Operation | Single-pole operation (FI): 3 poles on separate bases, 1 operating mechanism per pole; pole arrangement IoIoIo |
| Interrupter | SF6 self-compression (counter-acting piston), one interrupter unit per pole (3AP1 design up to 300 kV) |
| Family voltage range | 3AP1 platform 72.5–300 kV; 3AP family 72.5–1100 kV |
| Track record | Serial production since 1994; 43,534 3AP1 circuit breakers delivered (OEM count, 2020); factories in Berlin, Aurangabad, Hangzhou, Queretaro, Voronezh, Jackson |
| SAP reference | E3501 material 3AP1FI-245KV — 784 order lines since 2015 |
Electrical
| Rated voltage | 245 kV (also applied as the standard breaker on 220 kV grids) |
| Rated normal current | Up to 4,000 A (3AP1 type-tested range) |
| Rated short-circuit breaking current | 40–50 kA (3AP1 type-tested range); a European TSO frame contract lists 50 kA and 63 kA order-code variants at 245 kV |
| Rated short-time current | 40–50 kA, 1–3 s (3AP1 type-tested range) |
| Duty variants (frame contract) | Standard line duty (50 kA) and high-time-constant / generator duty (63 kA) per European TSO frame-contract product master data |
Mechanical / environment
| Operating mechanism | Stored-energy spring, one per pole; maintenance-free charging mechanism with roller bearings; patented drive identical across the 3AP family |
| SF6 gas quantity | approx. 17 kg per three-pole bay (3AP1 family value) |
| Bay width | Up to 8,235 mm (3AP1 family value) |
| Bay weight | approx. 3.4 t (3AP1 family value) |
| Transport & installation | Shipped fully pre-assembled and routine-tested (72.5–300 kV); single supervisor installs one breaker within about 1.5 days; no special tools or equipment |
| Maintenance intervals | M1 visual check after 12 years or 3,000 operations; M3 revision after 25 years or 6,000 operations (OEM recommendation, 5th AIS generation) |
Standards & certifications
| Type testing | Completely type-tested in accordance with latest IEC, ANSI and other standards before market launch |
| Test laboratory | Lead-factory laboratory (Berlin) accredited according to IEC 17025; part of the PEHLA network; member lab of the Short-Circuit Testing Liaison (STL) |
| Routine testing | Every breaker factory routine-tested before delivery (basis for minimal on-site commissioning) |
Options & variants
The SAP order-line count (784) was verified live against Snowflake E3501 VBAP/VBAK (orders since 2015) on 2026-07-04 during authoring of the sibling 3AP1 FG-145 entry; many lines are erection-supervision services booked on the equipment material, so counts indicate commercial relevance rather than pure unit shipments. Order codes, duty roles (standard vs. high time constant / generator), pole arrangement IoIoIo and rated voltage 245 kV read verbatim from a European TSO circuit-breaker frame-contract import file; the 50 kA code is listed there for 220 kV grid duty and the plain and 63 kA codes for 245 kV duty.
| Order code / SAP material | Configuration | Evidence |
|---|---|---|
| 3AP1FI-245KV | Live-tank FI, 245 kV, single-pole operation with separate pole bases (this product) | 784 E3501 order lines since 2015 (Snowflake-verified) |
| 3AP1FI-5S-245kV | 245 kV standard breaker, arrangement IoIoIo (frame-contract type CB-4a) | European TSO frame-contract product master data |
| 3AP1FI-5S-245kV/50kA | 220 kV grid standard breaker, 50 kA (frame-contract type CB-4a) | European TSO frame-contract product master data |
| 3AP1FI-5S-245kV/63kA | 63 kA duty variant — high-time-constant / generator applications (frame-contract type CB-4b) | European TSO frame-contract product master data |
Documents & downloads
Catalog High-Voltage Circuit Breakers — from 72.5 kV up to 1100 kV (Siemens Energy, 2022)
Datasheet 3AP1 Type Information — 5th AIS Generation (Siemens Energy Customer Services, 2020)
Brochure Maintenance of AIS 3A circuit breakers — Grid Technologies Service (2023)
Also covered in the technical library
Catalog High-Voltage Circuit Breakers from 72.5 kV up to 1100 kV — Siemens Energy brochure
Ordered designations
Representative orderable type designations of this family — searchable via the catalog search.
Related products
3AP1 DT-145 Circuit breaker 3AP1, 145 kV, 40 kA, stored-energy spring drive
145 kV rated voltage · 40 kA breaking / up to 3,150 A · SF6 self-compression interrupter, spring drive Datasheet · Dimensions ↓
3AP1 DT-245