3AP1 DT-245
Dead-tank circuit breaker 3AP1 DT, 245 kV, up to 63 kA, stored-energy spring drive
3AP1 DT-245
- Single-break 3AP arc-assist interrupter clears up to 63 kA at 245 kV with no TRV capacitors; 90 kA available with the SPS2-245 version
- FA stored-energy spring-spring mechanism — the same drive used across the 15 kV to 550 kV dead tank portfolio, with no in-field adjustments and virtually no maintenance
- Class M2 mechanical endurance (10,000 operations) and Class C2 capacitive switching certification
- Ships fully assembled and factory tested; gang or independent pole operation (IPO) on a common frame, PSD point-on-wave switching optional
- Up to four toroidal-core current transformers per bushing; IEEE 693 high seismic and -50 °C tank-heater options
245 kV transmission substation switchingExisting breaker replacement and retrofitMulti-CT protection schemes (up to four CTs per bushing)High seismic installations per IEEE 693High fault-duty networks up to 90 kA
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3AP1 DT-245 covers up to 245 kV of the circuit breakers range (≤ 800 kV across the category, √ scale).
Specifications
Main
| Type designation | 3AP1 DT (US market: SPS2S 245 kV / SPS2-245) |
| 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 |
| Pole operation | Gang or independent pole operation (IPO) on common frame |
| Insulating / quenching medium | SF6 (SF6/CF4 mixed-gas low-temperature option documented on the 3AP1 DT platform up to 170 kV only — not confirmed for 245 kV) |
| Current transformers | Up to four toroidal-core CTs per bushing; slip-over CTs optional |
| Bushings | Porcelain or composite; extra-creep option (215 in standard, 241 in custom) |
Electrical
| Rated maximum voltage | 245 kV |
| Rated continuous current | up to 4,000 A |
| Rated short-circuit breaking current | up to 63 kA (SPS2S-245); up to 90 kA (SPS2-245) |
| Interrupting time | 2 or 3 cycles |
| Lightning impulse withstand voltage (BIL) | up to 1,050 kV |
| Chopped-wave withstand (2 µs) | 1,160 kV |
| Closing and latching capability | up to 170 kA (up to 234 kA at 90 kA rating) |
| 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; high seismic design optional |
| Breaker weight | approx. 12,000 lb (approx. 5,400 kg) |
| SF6 filling | 162 lb at 87 psi |
| Delivery condition | Ships fully assembled and factory routine-tested; no in-field adjustments |
| Control voltages | Motor/trip/close 48/125/250 V DC or 120/240 V AC; 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 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 245 kV (2022 catalog, current online edition)
| Rated voltage | 245 kV |
| No. of interrupter units per pole | 1 |
| Rated short-duration power-frequency withstand voltage | 460 kV |
| Rated lightning impulse withstand voltage | 1,050 kV |
| Rated normal current | up to 4,000 A |
| Rated short-time withstand current (1 s – 3 s) | up to 90 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
SAP material codes are internal references shown as commercial provenance only; decodes are conservative and unverified. SAP order-line counts (1,022 / 784; family total 7,721 since 2015) were not independently re-verified in this review.
| Variant | Rated voltage | Short-circuit current | Configuration | Commercial evidence |
|---|---|---|---|---|
| 3AP1 DT 245 kV, 3-pole common frame (SAP: "3AP1DT-2-245KV 3-C") | 245 kV | up to 63 kA | Dead tank, gang-operated on common frame; "-2-" / "3-C" decoded conservatively as 2-cycle, three-pole common-frame (decode unverified) | Top SAP material — 1,022 order lines since 2015 (supervision/erection scope) |
| 3AP1 FI 245 kV live tank (SAP: 3AP1FI-245KV) | 245 kV | variant-dependent (not confirmed in cited sources; the US catalog's 245 kV live-tank ratings of 40/63 kA are listed for the CPV2/CPV2S family) | Live tank sibling, single-pole operation on separate bases; 3AP1 FI documented up to 300 kV | 2nd SAP material — 784 order lines (erection supervision) |
| SPS2S-245 (US designation) | 245 kV | up to 63 kA | 2- or 3-cycle, no TRV capacitors, gang or IPO | US-market standard version per 2021 datasheet |
| SPS2-245, 90 kA | 245 kV | up to 90 kA | High-fault-duty version, independent pole operation (datasheet drawing labels it "90 kA IPC") | Cataloged US variant (closing/latching up to 234 kA per datasheet; portfolio catalog states 243 kA) |
| 3AP1 DT low-temperature option | 245 kV | variant-dependent | Tank heaters to -50 °C at 245 kV; SF6/CF4 mixed gas exists on the 3AP1 DT platform but is documented only up to 170 kV (down to -60 °C) | Application-based customization per catalog |
Documents & downloads
Datasheet SPS2S 245 kV High Voltage 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)
Brochure Dead Tank Ready for Cooldown — 3AP1 DT up to 170 kV with mixed gases for lowest temperature applications
Ordered designations
Representative orderable type designations of this family — searchable via the catalog search.
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