The Thyrector, cataloged under National Stock Number 6740-00-677-4351, is classified within Federal Supply Class 6740 (Photographic Developing and Finishing Equipment) of the Photographic Equipment group. The manufacturer of record is Drs Naval Power Systems Inc Dba Drs Power & Control Technologies 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6740-00-677-4351 |
| Primary Part Number | 57-1640-3 |
| Item Name | Thyrector |
| FSC / FSG | 6740 / 67 — Photographic Developing and Finishing Equipment |
| Manufacturer | Drs Naval Power Systems Inc Dba Drs Power & Control Technologies Inc |
| Status | ACTIVE |
| General Characteristics Item Description | LENGTH 5.380 IN.,DIAMETER 0.680 IN.,PEAK INPUT VOLT 169.6,MAX LEAKAGE AT RATED VOLTAGE 1.2 MA,MAX OPERATING AMBIENT TEMP 55 DEG C,RATED PEAK DISCHARGE CURRENT 1.0 AMP IN |
| 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 |
|---|---|
| 57-1640-3 PRIMARY | Drs Naval Power Systems Inc Dba Drs Power & Control Technologies Inc (USA) |
| Reference | Meaning |
|---|---|
| 6RS20SP484 | 5/9 Secondary reference General Electric Co Outdoor Breaker Business Section |
NSN 6740-00-677-4351 is a Thyrector, manufactured by Drs Naval Power Systems Inc Dba Drs Power & Control Technologies Inc, classified under FSC 6740, Photographic Developing and Finishing Equipment. Status: active.
NSN 6740-00-677-4351 has 1 manufacturer part number on file: 57-1640-3 (Drs Naval Power Systems Inc Dba Drs Power & Control Technologies Inc).
1 possible match (shared part number, not a government interchangeability claim): 5365-00-688-1295. Verify interchangeability with system specifications before substitution.
Key specifications for 57-1640-3: General Characteristics Item Description: LENGTH 5.380 IN.,DIAMETER 0.680 IN.,PEAK INPUT VOLT 169.6,MAX LEAKAGE AT RATED VOLTAGE 1.2 MA,MAX OPERATING AMBIENT TEMP 55 DEG C,RATED PEAK DISCHARGE CURRENT 1.0 AMP IN. 1 specification is 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.