Dead-tank circuit breaker 3AP1 DT, 72.5 kV, up to 40 kA, stored-energy spring drive
3AP1 DT-72.5
- Single-break 3AP arc-assist interrupter clears up to 40 kA at 72.5 kV with 3-cycle interrupting time
- Standard operation to -40 °C without tank heaters — unique to the 15-72.5 kV class of the dead tank portfolio
- FA stored-energy spring-spring mechanism (FA 2 gang / FA 1 IPO) — the same maintenance-free drive used across the 15 kV to 550 kV dead tank portfolio
- Class M2 mechanical endurance (10,000 operations) and Class C2 capacitive switching certification
- Gang or independent pole operation (IPO) on a common frame; PSD point-on-wave switching, composite / extra-creep bushings and up to four CTs per bushing optional
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3AP1 DT-72.5 covers up to 72.5 kV of the circuit breakers range (≤ 800 kV across the category, √ scale).
Specifications
Main
| Type designation | 3AP1 DT (GT hierarchy: 3AP1DT-72,5kV; US market: SPS2-72.5) |
| Design | Dead tank — grounded metal-enclosed interrupter, single interrupter unit per pole |
| Interrupter | 3AP arc-assist self-compression interrupter with rupture disk per interrupter |
| Operating mechanism | FA stored-energy spring-spring drive, maintenance-free — FA 2 (gang) / FA 1 (IPO) at 72.5 kV per platform mechanism table |
| Pole operation | Gang or independent pole operation (IPO) on common frame |
| Insulating / quenching medium | SF6 (standard 72.5 kV breaker operates to -40 °C without tank heaters; the SF6/CF4 mixed-gas low-temperature option on the 3AP1 DT platform is documented for the 126-170 kV classes only) |
| Current transformers | Up to four toroidal-core CTs per bushing (optional) |
| Bushings | Porcelain or composite; extra-creep bushing option |
Electrical
| Rated maximum voltage | 72.5 kV |
| Rated continuous current | up to 3,500 A |
| Rated short-circuit breaking current | up to 40 kA |
| Interrupting time | 3 cycles |
| Lightning impulse withstand voltage (BIL) | 350 kV |
| Chopped-wave withstand (2 µs) | 452 kV |
| Closing and latching capability | up to 108 kA |
Mechanical / environment
| Low-temperature capability | Operation to -40 °C without tank heaters (standard feature of the 15-72.5 kV class) |
| Mechanical endurance | Class M2 (10,000 operations) |
| Capacitive switching | Class C2 |
| Seismic behavior | Low center of gravity of the dead tank base — higher seismic withstand capability (platform characteristic) |
| Delivery condition | Manufactured and routine-tested in the USA (Jackson, MS facility); no in-field adjustments required on the operating mechanism |
Standards & certifications
| Circuit breaker standards | Type tested to ANSI and IEC standards per manufacturer catalogs (specific standard numbers are not cited in the source documents) |
| Endurance classes | Class M2 mechanical (10,000 operations), Class C2 capacitive switching — classes as defined in IEC 62271-100 |
| Factory certifications | ISO 9001:2015, ISO 14001:2015, OHSAS 18001:2007 (US manufacturing facility, Jackson MS) |
| Testing | Every breaker routine-tested; platform type testing in PEHLA-network, IEC 17025-accredited laboratory (Berlin) |
Electrical — IEC ratings, 3AP1 DT 72.5 kV (2022 catalog, current online edition)
| Rated voltage | 72.5 kV |
| No. of interrupter units per pole | 1 |
| Rated short-duration power-frequency withstand voltage | 140 kV |
| Rated lightning impulse withstand voltage | 325 kV |
| Rated normal current | up to 3,150 A |
| Rated short-time withstand current (1 s – 3 s) | up to 40 kA |
| Rated break time | 2 cycles or 3 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
All rows transcribed from ratings tables in the staged US dead tank portfolio catalog. The CPV2/CPV2S and Blue Circuit Breaker rows are sibling products offered at the same voltage class, shown for portfolio context — they are not 3AP1 DT configurations.
| Variant | Rated voltage | Short-circuit current | Configuration | Catalog evidence |
|---|---|---|---|---|
| SPS2-72.5 (US designation of the 72.5 kV dead tank) | 72.5 kV | up to 40 kA | 3-cycle, gang or IPO on common frame, to -40 °C without tank heaters, up to 3,500 A | US dead tank portfolio catalog, SPS2 15 kV - 72.5 kV ratings table (p. 6) |
| SPS2-15.5 / SPS2-25.8 / SPS2-38 / SPS2-48.3 (lower-voltage frame siblings) | 15.5 / 25.8 / 38 / 48.3 kV | up to 40 kA each | Same FA spring-spring drive and 3AP arc-assist interrupter, shared 15-72.5 kV platform page; BIL 110/150/200/250 kV respectively | US dead tank portfolio catalog, SPS2 15 kV - 72.5 kV ratings table (p. 6) |
| CPV2/CPV2S 72.5 kV live tank option | 72.5 kV | 40 kA | Live tank circuit breaker / circuit switcher, 4,000 A, BIL 350 kV, power-frequency withstand 160 kV | US dead tank portfolio catalog, live tank option table (p. 11) |
| Blue Circuit Breaker 72.5 kV DT (Clean Air vacuum, SF6-free sibling) | 72.5 kV | 40 kA | Vacuum interruption, 3,150 A, released 2021 (72.5 kV LT version released 2018); FA spring-spring drive, M2/C2 | US dead tank portfolio catalog, Blue Circuit Breaker release table (p. 12) |
Documents & downloads
Catalog Siemens Energy High Voltage Dead Tank Circuit Breakers (US portfolio, SPS2 15-550 kV — includes SPS2 15 kV - 72.5 kV ratings)
Catalog High-Voltage Circuit Breakers — From 72.5 kV up to 1100 kV (2022) (current online edition)
Ordered designations
Representative orderable type designations of this family — searchable via the catalog search.
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