3AP1 FG-145
Live-tank circuit breaker 3AP1 FG, 145 kV, 40 kA, 3,150 A, SF6 self-compression, three-pole spring drive on common base
3AP1 FG-145
- SF6 self-compression interrupter unit, one per pole, requiring minimal actuating energy from the drive
- Patented stored-energy spring mechanism identical across the 3AP family from 72.5 kV to 1100 kV
- FG arrangement: three poles on a common base frame operated by a single mechanism for a compact footprint
- Delivered fully pre-assembled and routine-tested; commissioning without special tools or equipment
- Long service intervals per OEM recommendation: first visual check at 12 years, first revision at 25 years
145 kV transmission substationsOverhead line protection with auto-reclosingOutdoor air-insulated switchyardsSubstation retrofit and extension
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3AP1 FG-145 covers up to 145 kV of the circuit breakers range (≤ 800 kV across the category, √ scale).
Specifications
Main
| Type designation | 3AP1 FG (145 kV) |
| Design | Live-tank, air-insulated (AIS), outdoor |
| Operation | Three-pole (gang) operation; 3 poles, 1 common base frame, 1 operating mechanism per breaker |
| Interrupter | SF6 self-compression, one interrupter unit per pole |
| Family voltage range | 3AP1 FG available up to 245 kV; 3AP platform 72.5–1100 kV |
| Insulator options | Porcelain or composite (family option; not stated in read sources) |
Electrical
| Rated voltage | 145 kV |
| Rated normal current | 3,150 A |
| Rated short-circuit breaking current | 40 kA (3 s rated short-circuit duration) |
| Rated frequency | 50 Hz (documented reference variant); 60 Hz variants available in family |
| Insulation level | Lightning impulse 650 kV / power-frequency 275 kV withstand (reference 145 kV variant, per IEC 62271-100) |
| Rated operating sequence | O-0.3s-CO-3min-CO (auto-reclosing capable) |
| Control / auxiliary voltage | 110 V DC control and motor, 230 V AC heating (documented variant); 220 V DC control variant also delivered |
| Auxiliary contacts | 19 auxiliary switch contacts (9 NO, 9 NC, 1 wiper) in basic control variant |
| Insulator creepage | 31 mm/kV |
Mechanical / environment
| Operating mechanism | Stored-energy spring, maintenance-free charging mechanism |
| Mass (without support structure) | approx. 1,300 kg |
| SF6 filling | approx. 7.2 kg per breaker; rated pressure 6 bar (gauge) at 20 °C, alarm 5.2 bar / lockout 5.0 bar, with density monitor |
| Pole-to-pole distance | 1,700 mm (reference 145 kV design) |
| Ambient temperature | −20 °C to +45 °C (reference variant) |
| Wind load design | Rated for wind speeds of 34 m/s (reference design) |
| Terminal loading | 1.25 kN static / 2.5 kN static+dynamic tensile load at terminal (reference design) |
| Maintenance intervals | Visual check at 12 years; first revision at 25 years (OEM recommendation, 5th/6th generation 3AP) |
Standards & certifications
| Circuit breaker standard | IEC 62271-100 |
| Type testing | Fully type-tested to latest IEC, ANSI and other standards; lead-factory laboratory accredited to IEC 17025, PEHLA member, Short-Circuit Testing Liaison (STL) member lab |
| Earthing terminals | M12 to DIN 46011 and NEMA |
| Dimensional tolerances | ISO 2768-1C (per general arrangement drawing) |
Options & variants
Counts re-verified live against SAP E3501 (Snowflake VBAP/VBAK, order date >= 2015): 7,721 3AP1* lines total. Many lines against these materials are erection-supervision services booked on the equipment material, so counts indicate commercial relevance of each configuration rather than pure unit shipments. DT/FI rows are platform siblings shown for context; the FG-145 configuration is this product page's subject.
| SAP material | Decoded configuration | Order lines since 2015 |
|---|---|---|
| 3AP1FG-1S-145KV | Live tank FG-1S, 145 kV / 40 kA / 3,150 A, three-pole operation on common base frame (this product) | 1,492 |
| 3AP1DT-1S-145KV | Dead-tank sibling, 145 kV / 40 kA, gang-operated (SAP: '3AP1 Dead Tank DT-1S-145 kV 40 kA FG') | 1,782 |
| 3AP1DT-2-245KV 3-C | Dead-tank sibling, 245 kV / 63 kA, single-pole operation (SAP: '3AP1 Dead Tank DT-2-245 kV 3C 63 kA FI') | 1,022 |
| 3AP1FI-245KV | Live tank FI, 245 kV, single-pole operation with separate pole bases | 784 |
| 3AP1DT-1S (KMAT) | Configurable dead-tank material (KMAT), base configuration 145 kV / 40 kA | 617 |
Documents & downloads
Catalog High-Voltage Circuit Breakers — from 72.5 kV up to 1100 kV (Siemens Energy, 2022)
Datasheet 3AP1FG 145 kV, 40 kA, 3,150 A — general arrangement & technical data (110 V DC control)
Brochure Maintenance of AIS 3A circuit breakers — Grid Technologies Service (2023)
Also covered in the technical library
Manual 3AP1 FG Circuit Breaker up to 170 kV — Operating Instructions
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.
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