Live-tank circuit breaker 3AP1 FG, 170 kV, 40 kA, 3,150 A, SF6 self-compression, three-pole spring drive on common base
3AP1 FG-170
- SF6 self-compression interrupter unit, one per pole, with SF6 as combined insulating and arc-quenching medium
- Single stored-energy spring mechanism for all three phases: one common closing spring and one opening spring; centre pole driven via corner gear, outer poles via coupling rods
- Suitable for triple-pole auto-reclosing: rated operating sequence O-0.3s-CO-3min-CO or CO-15s-CO
- 750 kV lightning-impulse / 325 kV power-frequency withstand, with 25 mm/kV or 31 mm/kV insulator creepage classes documented
- Long service intervals: routine inspection at 12 years or 3,000 operating cycles, major inspection at 25 years or 6,000 cycles
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3AP1 FG-170 covers up to 170 kV of the circuit breakers range (≤ 800 kV across the category, √ scale).
Specifications
Main
| Type designation | 3AP1 FG (170 kV) |
| Design | Live-tank, air-insulated (AIS), triple-pole outdoor design |
| Operation | Three-pole (gang) operation; 3 pole columns on a common breaker base, 1 operating mechanism per breaker (pole B driven via corner gear, poles A and C via coupling rods) |
| Interrupter | SF6 self-compression, one interrupter unit per pole; pole columns connected by tubes into one monitored gas compartment |
| Family voltage range | 3AP1 FG available up to 245 kV; 3AP platform 72.5–1100 kV |
| Documentation | Dedicated operating manual 927 00210 174 E covers 3AP1 FG for rated voltages up to 170 kV (DE/EN) |
Electrical
| Rated voltage | 170 kV |
| Rated normal current | 3,150 A |
| Rated short-circuit breaking current | 40 kA (1 s rated short-circuit duration) |
| Rated making current | 100 kA |
| Rated frequency | 50 Hz (documented reference variant) |
| Insulation level | Lightning impulse 750 kV / power-frequency 325 kV withstand — to earth, across the open breaker and between phases (per IEC insulation rating table) |
| Rated operating sequence | O-0.3s-CO-3min-CO or CO-15s-CO (auto-reclosing capable) |
| Insulator creepage | Min. 4,250 mm to earth (25 mm/kV class) or 5,270 mm (31 mm/kV class) |
| Auxiliary switch | Type 3SV 92; rated 48–220 V DC, 10 A continuous current |
Mechanical / environment
| Operating mechanism | Stored-energy spring mechanism in drive unit on the breaker base; one common closing spring and one opening spring for all three poles |
| Operating times | Closing 55 ± 8 ms, opening 30 ± 4 ms, break time ≤ 57 ms, arcing ≤ 23 ms (standard tripping device); quick variant 46 ± 8 / 23 ± 3 / ≤ 49 ms |
| SF6 filling | 12.3 kg per breaker (206.4 dm³); nominal pressure 8.0 bar at 20 °C, alarm 7.2 bar, general lockout 7.0 bar, minimum 3.0 bar for mechanical operation; density monitor and pressure gauge |
| Flashover distance | 1,500 mm to earth / 1,400 mm across the open breaker / 1,510 mm between phases |
| Ambient temperature | −20 °C to +40 °C (reference variant) |
| Anti-condensation heating | approx. 115 W for operating mechanism unit and control; heaters must be permanently switched on |
| Maintenance intervals | Routine inspection after 12 years or 3,000 operating cycles (gas compartments not opened); major inspection after 25 years or 6,000 cycles |
| Breaker weights | Per order-specific dimension drawing (not stated in the read manual) |
Standards & certifications
| Circuit breaker standard | IEC 60056 and VDE 0670 parts 101–108 (manual edition); current 3AP family fully type-tested to latest IEC and ANSI standards |
| Altitude correction | External insulation derating above 1,000 m per IEC 60694 (05/96) altitude formula |
| Type testing | Lead-factory laboratory accredited to IEC 17025, PEHLA member, Short-Circuit Testing Liaison (STL) member lab (3AP family) |
Options & variants
Operating-times table reproduced verbatim from the 3AP1 FG ≤170 kV operating manual (927 00210 174 E, section 1 'Operating times'): the breaker is documented with a standard or a quick tripping device. Insulator creepage is likewise offered in 25 mm/kV (4,250 mm) and 31 mm/kV (5,270 mm) classes per the same manual's insulation table. No SAP per-material order statistics were compiled for the 170 kV class in the read sources.
| Documented option | Standard tripping device | Quick tripping device |
|---|---|---|
| Closing time | 55 ± 8 ms | 46 ± 8 ms |
| Opening time | 30 ± 4 ms | 23 ± 3 ms |
| Break time | ≤ 57 ms | ≤ 49 ms |
| Minimum command duration | 80 ms | 80 ms |
Documents & downloads
Manual Operating manual — Circuit Breaker 3AP1 FG for rated voltages up to 170 kV (927 00210 174 E, DE/EN)
Catalog High-Voltage Circuit Breakers — from 72.5 kV up to 1100 kV (Siemens Energy, 2022)
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.
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