The Circuit Breaker, cataloged under National Stock Number 5925-00-453-5891, is classified within Federal Supply Class 5925 (Circuit Breakers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Lockheed Martin Librascope Corporation. Government technical data includes 29 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5925-00-453-5891 |
| Primary Part Number | T505 004 344 |
| Item Name | Circuit Breaker |
| FSC / FSG | 5925 / 59 — Circuit Breakers |
| Manufacturer | Lockheed Martin Librascope Corporation |
| Status | ACTIVE |
| Bushing Length | 0.280 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN |
| Reset Method | MANUAL |
| Internal Trip Release Configuration | SERIES TRIP ALL LOCATIONS |
| Operating Voltage Type and Rating Per Pole in Volts | 50.0 DC ALL LOCATIONS |
| Mounting Facility Type and Quantity | 1 THREADED BUSHING WITH PANEL SEAL |
| Actuator Position Designation | AT EACH POLE |
| Switch Terminal Type | WIRE HOOK |
| Center to Center Distance Between Terminals Parallel to Width | 0.625 INCHES NOMINAL IN |
| Nonturn Device Radius | 0.336 INCHES NOMINAL IN |
| Body Style | MULTIPOLE-SINGLE ACTUATOR TYPE |
| Switch Voltage Rating and Type in Volts | 50.0 DC |
| Ultimate Trip Rating of Continuous Current Rating Per Pole in Percent | 115.0 ALL LOCATIONS |
| Arc Quenching Method | MAGNETIC BLOWOUT |
| Switch Location and Position Designation | INTERNAL AT EACH POLE |
| Circuit Protection Type | OVERCURRENT ALL LOCATIONS |
| Body Width | 1.281 INCHES MAXIMUM IN |
| Storage Type | GENERAL PURPOSE WAREHOUSE |
| Criticality Code Justification | FEAT |
| Pole Quantity | 2 |
| Mounting Surface to Terminal End Distance | 1.828 INCHES MAXIMUM IN |
| Maximum Continuous Load Current Rating Per Pole | 5.0 AMPERES DC ALL LOCATIONS |
| Trip Release Characteristic | TIME DELAY ALL LOCATIONS |
| Maximum Interrupting Capacity Current Type and Rating Per Pole in Amps | 500.0 DC ALL LOCATIONS |
| Nominal Thread Size | 0.375 INCHES IN |
| Body Length | 1.562 INCHES MAXIMUM IN |
| Trip Delay Time in Seconds Per Rated Continuous Current | 0.500 MINIMUM AT 200 PCT AND 9.000 MAXIMUM AT 200 PCT ALL LOCATIONS |
| Manual Actuator Type and Quantity | 1 TOGGLE |
| Switch Current Rating and Type in Amps | 0.5 DC |
| Inclosure Protection Type for Which Designed | FUNGUS RESISTANT AND HERMETICALLY SEALED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| T505 004 344 | Lockheed Martin Librascope Corporation (USA) |
| Reference | Meaning |
|---|---|
| 2638051-144 | 7/2 Vendor item drawing reference Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| 2638051-144 | 3/2 Design control — primary reference U.S. Government activity |
| AP12RC-114-144 | 5/1 Secondary reference U.S. Government activity |
| 2638051-144 | 5/9 Secondary reference Eaton Corp Heinemann Products Commercial Controls Div |
NSN 5925-00-453-5891 is a Circuit Breaker, manufactured by Lockheed Martin Librascope Corporation, classified under FSC 5925, Circuit Breakers. Status: active.
NSN 5925-00-453-5891 has 1 manufacturer part number on file: T505 004 344 (Lockheed Martin Librascope Corporation).
Key specifications for T505 004 344: Bushing Length: 0.280 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN; Reset Method: MANUAL; Internal Trip Release Configuration: SERIES TRIP ALL LOCATIONS; Operating Voltage Type and Rating Per Pole in Volts: 50.0 DC ALL LOCATIONS. 29 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.