Dead-tank circuit breaker 3AP1 DT, 362 kV, up to 80 kA, 2-cycle, stored-energy spring drive
3AP1 DT-362
- Single-break 3AP arc-assist interrupter — one break per phase up to 63 kA with no TRV capacitors; ratings up to 80 kA and 5,000 A at 362 kV
- Standard IPO configuration with fixed 2-cycle interrupting time for EHV applications; FA 4/5 stored-energy spring-spring drive (paired with the dynamic self-compression interrupter), no adjustments and virtually no maintenance
- Class M2 mechanical endurance (10,000 operations) and Class C2 capacitive switching; IEEE 693 seismic withstand with high seismic option
- Optional common frame version — typically installed on an existing foundation in less than one day; ships fully assembled and factory tested
- Pre-insertion resistors (150-3,500 ohms) with externally adjustable insertion time, PSD point-on-wave switching, composite bushings and tank heaters to -50 °C available
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3AP1 DT-362 covers up to 362 kV of the circuit breakers range (≤ 800 kV across the category, √ scale).
Specifications
Main
| Type designation | 3AP1 DT (IEC designation, platform documented up to 362 kV) — US market: SPS2-362 / SPS2S 362 kV |
| Design | Dead tank — grounded metal-enclosed interrupter, single interrupter unit per pole (one break per phase up to 63 kA) |
| Interrupter | 3AP arc-assist self-compression interrupter with rupture disk per interrupter; no TRV capacitors required up to 63 kA |
| Operating mechanism | FA stored-energy spring-spring drive, maintenance-free; portfolio drive table assigns FA 4/5 (dynamic self-compression, IPO) to the 362 kV class |
| Pole operation | Independent pole operation (IPO) standard; common frame version optional |
| Insulating / quenching medium | SF6 |
| Current transformers | Toroidal-core bushing CTs; standard provision for up to four CTs per bushing (platform feature) |
| Bushings | Porcelain or composite; external creep 356 in standard, 442 in custom |
| Pre-insertion resistors | Optional, 150-3,500 ohms, with externally adjustable insertion time (PIR solution available at 362 kV and 550 kV) |
Electrical
| Rated maximum voltage | 362 kV |
| Rated continuous current | up to 5,000 A |
| Rated short-circuit breaking current | up to 80 kA |
| Interrupting time | 2 cycles |
| Lightning impulse withstand voltage (BIL) | 1,300 kV |
| Chopped-wave withstand (2 µs) | 1,680 kV (datasheet table header prints "kA" — evident typo for kV, as on the sibling 245 kV sheet) |
| Closing and latching capability | up to 216 kA |
| Rated duty cycle | OCO – 15s – CO (no derating); rated reclosing time 12 cycles |
Mechanical / environment
| Operating temperature range | -30 to +55 C standard; -50 to +55 C with tank heaters (custom) |
| Mechanical endurance | Class M2 (10,000 operations) |
| Capacitive switching | Class C2 |
| Seismic withstand | IEEE 693 standard; IEEE 693 high seismic design optional |
| Breaker weight | 5,688 lb per phase (approx. 2,580 kg per phase) |
| SF6 filling | 385 lb at 87 psi |
| Delivery condition | Ships fully assembled and factory tested; no adjustments and virtually no maintenance. Common frame version typically installed on an existing foundation in less than one day |
| Control voltages | Motor 48/125/250 V DC or 120/240 V AC; trip and close coils 48/125/250 V DC; auxiliary 120/240 V AC |
Standards & certifications
| Circuit breaker standards | Type tested to IEC and ANSI/IEEE standards per manufacturer catalogs (specific standard numbers are not cited in the source documents) |
| Seismic qualification | IEEE 693 (standard); IEEE 693 high seismic optional |
| 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 dead-tank manufacturing facility, Jackson/Richland MS) |
| Testing | Every breaker routine-tested; platform type testing in the Berlin lead-factory laboratory — IEC 17025 accredited, PEHLA network, Short-Circuit Testing Liaison (STL) member lab |
Electrical — IEC ratings, 362 kV dead tank (2022 catalog, current online edition)
| Table columns | 3AP1 362 (1 interrupter unit per pole) and 3AP2/3 362 (2 interrupter units per pole) |
| Rated voltage | 362 kV |
| Rated short-duration power-frequency withstand voltage | 520 kV |
| Rated lightning impulse withstand voltage | 1,380 kV |
| Rated switching impulse withstand voltage | 950 kV |
| Rated normal current | up to 5,000 A (3AP1 362) / up to 4,000 A (3AP2/3 362) |
| Rated short-time withstand current (1 s – 3 s) | up to 63 kA (3AP1 362, single interrupter) / up to 80 kA (3AP2/3 362, two interrupters) |
| 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) |
| Pre-insertion resistor | 362 kV and 550 kV available with pre-insertion resistor (PIR) — catalog table footnote |
| Maintenance after | 25 years |
Options & variants
All rows are taken from printed catalog/datasheet tables. The 80 kA table rating exceeds the "single break up to 63 kA / no TRV capacitors up to 63 kA" standard-feature statements; the sources do not describe the interrupter arrangement of the 80 kA version, so no claim is made about it.
| Variant | Rated voltage | Short-circuit current | Configuration | Source |
|---|---|---|---|---|
| SPS2-362 (SPS2S 362 kV, US designation) | 362 kV | up to 80 kA | IPO standard, 2-cycle, up to 5,000 A, BIL 1,300 kV, closing/latching up to 216 kA | SPS2 362 kV datasheet 2021 ratings table; US portfolio catalog p. 9 |
| SPS2 362 kV common frame version | 362 kV | variant-dependent (option on the 362 kV line) | Three poles on a common frame; typically installed on an existing foundation in less than one day | US portfolio catalog p. 9 (optional feature); 2021 datasheet customization list |
| 3AP1 DT (IEC designation) | up to 362 kV | up to 90 kA with one interrupter unit (platform statement, dead tank line) | Single-interrupter dead tank; 362 kV is the documented ceiling of the 3AP1 DT type | HV Circuit Breakers catalog 2022, modular-design type table and dead-tank chapter |
| 3AP1 DT with pre-insertion resistors | 362 kV | variant-dependent | PIR 150-3,500 ohms with externally adjustable insertion time; PIR solution available at 362 kV and 550 kV | 2021 datasheet customization list; HV Circuit Breakers catalog 2022 dead-tank chapter |
| Live tank alternative 3AP2/3, 362 kV | 362 kV | 40 kA | Two interrupter units per pole, 5,000 A, BIL 1,300 kV, power-frequency withstand 555 kV — live-tank 3AP1 single-break types end at 300 kV | US portfolio catalog p. 11 live-tank table |
Documents & downloads
Datasheet SPS2 362 kV High Voltage SF6 Dead Tank Circuit Breakers (2021)
Catalog Siemens Energy High Voltage Dead Tank Circuit Breakers (US portfolio, SPS2 15–550 kV)
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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