Siemens Energy 3AP1 DT 72.5 kV SF6 Dead Tank Circuit Breakers | Unused Surplus, IEC 62271-100 Design (Qty 3)

New 72.5 kV breakers carry long OEM lead times. These three are in stock and can ship without the wait.

The units are Siemens Energy 3AP1 DT 72.5 kV SF6 dead tank circuit breakers, built to an IEC 62271-100 design. IEEE/ANSI (C37.04, C37.06, C37.09) type-test coverage for this design has not been confirmed by Siemens Energy in writing and is not represented. Read the design standard section below before specifying these units into a U.S. utility application. Each is an outdoor, SF6-insulated, three-pole gang-operated breaker rated 2000A continuous, 40kA short-circuit, with a 325 kV BIL and a spring operating mechanism. They have never been energized or placed in service.

CTG is the seller of record. The units are sold as unused surplus on an as-is, where-is, with-all-faults basis. 

Serious inquiries move fast. Tell us your application, timeline, and project, and we will get you the spec sheet, photos, and next steps.

Highlights

• Siemens Energy 3AP1 DT, 72.5 kV SF6 dead tank circuit breaker
• Rated 2000A continuous, 40kA short-circuit, 60Hz
• 325 kV BIL, 140 kV power-frequency withstand
• Outdoor, three-pole gang-operated, spring mechanism
• IEC 62271-100 design. IEEE/ANSI type-test coverage not confirmed by the OEM and not represented
• Best fit: owner-acceptance applications, industrial and IPP buyers who write their own specifications, and export markets where IEC is the native standard
• Three units available, in stock in Des Moines, Iowa
• Unused surplus, never energized or placed in service
• Sold as-is, where-is, with all faults. Inspection on request

Design standard: what U.S. buyers should know

These units carry a 72.5 kV nameplate, which is a standard IEC rated maximum voltage and also the maximum design voltage of the 69 kV ANSI class. The nameplate alone does not tell you which standard the design was type tested to. The differences live in the ratings behind it, and they matter for a U.S. utility specification:

• Insulation level. These units are rated 325 kV BIL, the common IEC level for 72.5 kV. The ANSI 69 kV class is customarily specified at 350 kV BIL. Where your specification calls for 350 kV, these units do not meet it.
• Operating sequence and interrupting time. Stated to IEC convention (O-0.3s-CO-15s-CO, milliseconds). IEC and ANSI duty cycles are not interchangeable by conversion.
• Transient recovery voltage. TRV envelopes and test-duty definitions follow IEC 62271-100.
• Bushing current transformers, control wiring, and nameplate conventions. Built to the OEM's IEC-market practice. Confirm CT accuracy classes and ratios against your protection scheme (U.S. relay coordination is typically built around IEEE C57.13 C-class CTs) and confirm wiring and terminal designations against your integration standards.
• Seismic. Qualified to AF5 (0.5g) on the OEM drawings. IEEE 693 qualification is not represented.
• No path to IEEE recertification. Type-test certification attaches to the design, not the serial number. Individual units cannot be tested into IEEE conformity after the fact.

Specifications (per unit, verified)

Electrical

• Rated voltage (Ur): 72.5 kV
• Rated frequency (fr): 60 Hz
• Rated normal current (Ir): 2,000 A
• Max rated short-circuit breaking current (Isc): 40 kA symmetrical
• DC time constant: 45 ms
• DC component of rated short-circuit current: 45%
• First-pole-to-clear factor (kpp): 1.3
• Rated duration of short-circuit (tk): 1 s
• Rated lightning impulse withstand, BIL (Up): 325 kV peak
• Power-frequency withstand, 1 min (Ud): 140 kV (to ground and across open gap)
• Rated operating sequence: O-0.3s-CO-15s-CO
• Rated line-charging breaking current (Il): 10 A
• Rated cable-charging breaking current (Ic): 125 A
• Minimum specific creepage distance: 31 mm/kV (phase-to-phase)
• Prototype main-circuit resistance: 80 micro-ohm

Insulation and standards

• Design standard: IEC 62271-100. IEEE/ANSI C37 type-test coverage not confirmed by the OEM and not represented. A written standards conformity statement has been requested from Siemens Energy.
• Configuration: outdoor, SF6-insulated, dead tank, three-pole gang-operated

SF6 system

• Rated filling pressure at +20C: 0.60 MPa (6.0 bar / 87.5 psig)
• Alarm / signal-loss pressure at +20C: 0.52 MPa
• General lockout pressure at +20C: 0.50 MPa
• Total SF6 charge per unit: 13.7 kg

Mechanism and control

• Operating mechanism: spring charged (type FA-2), three-pole operation
• Control voltage: 125 VDC
• Motor voltage: 125 VDC
• Heater voltage: 120 VAC
• Seismic qualification: AF5 (0.5g) per the OEM drawings. IEEE 693 qualification is not represented.

Weight

• Total mass of circuit breaker: 1,670 kg per unit

Unit identification

Included

• Three-pole dead tank breaker with integral SF6 system
• Integral low-voltage control cabinet
• Spring operating mechanism (type FA-2)
• Original Siemens engineering drawings supplied with the units

Terms and CTA

• Sold as-is, where-is, with all faults. No express or implied warranties.
• Buyer inspection period available before closing.
• Loading, rigging, and transport arranged by the buyer.

Ready to move on a project? Contact CTG Power Systems for the spec sheet, photos, and availability.