Description
Does your substation switchgear possess the mechanical strength to withstand a high-energy short circuit without catastrophic failure? When medium-voltage distribution systems encounter a fault, the internal contact surfaces of the circuit breaker bear the entire thermal and dynamic load. The Siemens D201479 vacuum interrupter pole acts as the primary arc-quenching element inside medium-voltage circuit breakers (such as the Siemens 3AH series), isolating fault currents within milliseconds.
[Available Stock: 2 Units]
[Condition: New Original (New Surplus - In Original Protective Factory Packaging)]
[Lead Time: Ships within 2-4 business days via Expedited Air Freight or Ocean Cargo]
[Warranty: 12-Month Supplier Warranty]
[Pricing Note: Listed price is a market reference. Final transactional pricing fluctuates based on global metal indexes (copper/silver), customs clearance variables, and regional availability. Contact our logistics desk for a firm, itemized commercial quote.]
Technical Specification Matrix
| Parameter | Value / Specification |
| Model Number | D201479 |
| Product Type | Vacuum Interrupter / Vacuum Bottle Assembly |
| Manufacturer | Siemens AG |
| Rated Voltage | 12 kV to 24 kV (Cross-reference breaker nameplate) |
| Rated Normal Current | 1250 A / 1600 A (Dependent on enclosure ventilation) |
| Rated Short-Circuit Breaking Current | 25 kA / 31.5 kA |
| Rated Frequency | 50 / 60 Hz |
| Contact Material | Copper-Chromium (CuCr) matrix |
| Mechanical Operating Cycles | 10,000 to 20,000 operations |
| Compatible Equipment | Siemens 3AH, 3AF, and 3AG vacuum circuit breakers |
Real-World Field Notes on Heavy Electrical Interrupters
In field deployments across heavy manufacturing facilities and grid substations, handling these high-vacuum components requires extreme care. The D201479 relies on a flawless ceramic insulator body surrounding a hermetically sealed vacuum chamber (10^{-7} mbar or lower). When unpacking the unit, verify that the moving contact bellows are pristine—any dent, scratch, or lateral twisting force on the moving copper shaft during installation can introduce micro-leaks, destroying the vacuum integrity.
Well, technically the pole assembly delivers its full short-circuit interruption rating natively, but only if the external breaker mechanism matches the factory-specified contact force and overtravel (wipe distance). On a recent maintenance overhaul at a regional pumping station, we observed that tracking contact erosion via the built-in score marks on the stem is critical during routine outages. If the wear mark alignment shifts past the threshold, contact material has degraded from arcing, and the interrupter must be replaced. When tightening the terminal connections to the main copper busbars, always use a backup wrench to counteract the torque—don’t underestimate how easily an uncountered twist can rupture the internal stainless steel bellows.
Global Logistics, Customs, and Import Compliance
Shipping specialized power distribution components across international borders demands precise regulatory compliance. Because vacuum interrupters are high-value assets vital to electrical infrastructure, global customs authorities frequently evaluate these shipments to confirm industrial application rather than restricted military infrastructure use.
Our logistics personnel construct rigid, custom-padded crates to isolate the delicate ceramic shells from drop impacts and excessive vibrations during transit. We manage international transport routing under standard Incoterms 2020 frameworks (typically FCA, CIP, or DAP for rapid delivery).
Logistics Tip: For seamless customs processing at major entry hubs like Rotterdam, Singapore, or the Port of Newark, ensure the commercial invoice explicitly highlights Harmonized System (HS) code 8538.90.81 for parts destined for high-voltage circuit breakers and electrical switchgear.
Procurement FAQ
- Is this a complete three-phase circuit breaker assembly? No. The D201479 is a single-pole vacuum interrupter element. A standard three-phase AC distribution system requires three matching poles mounted to a shared operating mechanism frame.
- How do we verify the vacuum condition before field commissioning? Run a standard power-frequency voltage withstand test (hi-pot test) across the open contacts as detailed in the Siemens 3AH hardware manual. A sudden current spike or failure to hold the test voltage indicates a compromised vacuum.
- Are the electrical contact surfaces silver-plated? Yes. The connection faces on the terminal rods feature high-conductivity plating to minimize electrical contact resistance, preventing localized thermal buildup under high continuous current loads.
