The Protector,hearing, cataloged under National Stock Number 4240-01-321-8147, is classified within Federal Supply Class 4240 (Safety and Rescue Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. The manufacturer of record is Square D Co Monroe Plant. Government technical data includes 2 specifications, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4240-01-321-8147 |
| Primary Part Number | 330-3001 |
| Item Name | Protector,hearing |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Manufacturer | Square D Co Monroe Plant |
| Status | ACTIVE |
| Body Style | HEADSET, COVERED |
| Headband Type | ADJUSTABLE DOUBLE BAND |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 330-3001 PRIMARY | Square D Co Monroe Plant (USA) |
| Reference | Meaning |
|---|---|
| T204884 | 3/2 Design control — primary reference U.S. Government activity |
| 1000 | 5/9 Secondary reference U.S. Government activity |
NSN 4240-01-321-8147 is a Protector,hearing, manufactured by Square D Co Monroe Plant, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
NSN 4240-01-321-8147 has 1 manufacturer part number on file: 330-3001 (Square D Co Monroe Plant).
Key specifications for 330-3001: Body Style: HEADSET, COVERED; Headband Type: ADJUSTABLE DOUBLE BAND. 2 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). 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.