The Circuit Breaker,air, cataloged under National Stock Number 4920-01-556-9984, is classified within Federal Supply Class 4920 (Aircraft Maintenance and Repair Shop Specialized Equipment) of the Maintenance and Repair Shop Equipment group. The manufacturer of record is Siemens Industrial Automation Inc. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Circuit Breaker,air |
| FSC / FSG | 4920 — Aircraft Maintenance and Repair Shop Specialized Equipment (FSG 49) |
| Manufacturers | Siemens Industrial Automation Inc (CAGE 0TX97) |
| Parameter | Value |
|---|---|
| NSN | 4920-01-556-9984 |
| Primary Part Number | 5SY4206-8 |
| Item Name | Circuit Breaker,air |
| FSC / FSG | 4920 / 49 — Aircraft Maintenance and Repair Shop Specialized Equipment |
| Manufacturer | Siemens Industrial Automation Inc |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| 5SY4206-8 PRIMARY | Siemens Industrial Automation Inc (USA) |
NSN 4920-01-556-9984 is a Circuit Breaker,air, manufactured by Siemens Industrial Automation Inc, classified under FSC 4920, Aircraft Maintenance and Repair Shop Specialized Equipment. Status: active.
NSN 4920-01-556-9984 has 1 manufacturer part number on file: 5SY4206-8 (Siemens Industrial Automation Inc).
1 possible match (shared part number, not a government interchangeability claim): 5925-01-571-9438. Verify interchangeability with system specifications before substitution.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 4920-01-556-9984 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.