The Air Switch Assembly, cataloged under National Stock Number 4140-01-154-9625, is classified within Federal Supply Class 4140 (Fans, Air Circulators, and Blower Equipment) of the Refrigeration, AC, and Air Circulating Equipment group. The manufacturer of record is Spencer Industries Inc. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4140-01-154-9625 |
| Primary Part Number | 540R051G02 |
| Item Name | Air Switch Assembly |
| FSC / FSG | 4140 / 41 — Fans, Air Circulators, and Blower Equipment |
| Manufacturer | Spencer Industries Inc |
| Status | ACTIVE |
| General Characteristics Item Description | CONSISTS OF AIR SWITCH P/N 584R487H02; BLOCK P/N 540R047H01; THREE 6 IN. WIRES VARIOUS COLORS; ONE 3 IN. TUBING; VENTURI P/N 540R103H01 IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 540R051G02 | Spencer Industries Inc (USA) |
| Reference | Meaning |
|---|---|
| 540R051G02 | 3/2 Design control — primary reference U.S. Government activity |
| 540R051G01 | 5/9 Secondary reference U.S. Government activity |
NSN 4140-01-154-9625 is a Air Switch Assembly, manufactured by Spencer Industries Inc, classified under FSC 4140, Fans, Air Circulators, and Blower Equipment. Status: active.
NSN 4140-01-154-9625 has 1 manufacturer part number on file: 540R051G02 (Spencer Industries Inc).
Key specifications for 540R051G02: General Characteristics Item Description: CONSISTS OF AIR SWITCH P/N 584R487H02; BLOCK P/N 540R047H01; THREE 6 IN. WIRES VARIOUS COLORS; ONE 3 IN. TUBING; VENTURI P/N 540R103H01 IN. 1 specification is documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
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.