The Circuit Breaker, cataloged under National Stock Number 5925-00-976-4883, 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 30 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5925-00-976-4883 |
| Primary Part Number | L505000055 |
| Item Name | Circuit Breaker |
| FSC / FSG | 5925 / 59 — Circuit Breakers |
| Manufacturer | Lockheed Martin Librascope Corporation |
| Status | ACTIVE |
| Bushing Length | 0.380 INCHES MAXIMUM IN |
| Reset Method | MANUAL |
| Internal Trip Release Configuration | SERIES TRIP SINGLE LOCATION |
| Operating Voltage Type and Rating Per Pole in Volts | 240.0 AC SINGLE LOCATION |
| Mounting Facility Type and Quantity | 1 THREADED BUSHING WITH PANEL SEAL |
| Actuator Position Designation | AT POLE ONE |
| Frequency in Hertz | 400.0 SINGLE LOCATION |
| Unpackaged Unit Weight | 1.800 OUNCES NOMINAL OZ |
| Fragility Factor | MODERATELY RUGGED |
| Body Style | SINGLE POLE TYPE |
| Ultimate Trip Rating of Continuous Current Rating Per Pole in Percent | 115.0 SINGLE LOCATION |
| Arc Quenching Method | MAGNETIC BLOWOUT |
| Circuit Protection Type | OVERCURRENT SINGLE LOCATION |
| Body Width | 0.625 INCHES MAXIMUM IN |
| Storage Type | GENERAL PURPOSE WAREHOUSE |
| Pole Quantity | 1 |
| Mounting Surface to Terminal End Distance | 1.605 INCHES MAXIMUM IN |
| Thread Pitch Diameters | +0.3503 TO 0.3537 INCHES IN |
| Maximum Continuous Load Current Rating Per Pole | 1.5 AMPERES AC SINGLE LOCATION |
| Trip Release Characteristic | TIME DELAY SINGLE LOCATION |
| Maximum Interrupting Capacity Current Type and Rating Per Pole in Amps | 1000.0 AC SINGLE LOCATION |
| Nominal Thread Size | 0.375 INCHES IN |
| Body Length | 1.562 INCHES MAXIMUM IN |
| Trip Delay Time in Seconds Per Rated Continuous Current | 0.055 MINIMUM AT 200 PCT AND 0.950 MAXIMUM AT 200 PCT SINGLE LOCATION |
| Manual Actuator Type and Quantity | 1 TOGGLE |
| Inclosure Protection Type for Which Designed | HERMETICALLY SEALED AND SHOCK RESISTANT AND VIBRATION RESISTANT |
| Thread Quantity Per Inch | 32 |
| Actuator Function | TRIP-RESET |
| Terminal Type and Quantity | 2 WIRE HOOK |
| Special Handling Feature | MAGNETIC |
| 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 |
|---|---|
| L505000055 PRIMARY | Lockheed Martin Librascope Corporation (USA) |
| 2039333-25 | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| Reference | Meaning |
|---|---|
| AP-1-1-41-152 | 5/2 Secondary reference U.S. Government activity |
| 520A152 | 5/9 Secondary reference U.S. Government activity |
NSN 5925-00-976-4883 is a Circuit Breaker, manufactured by Lockheed Martin Librascope Corporation, classified under FSC 5925, Circuit Breakers. Status: active.
NSN 5925-00-976-4883 has 2 manufacturer part numbers on file: L505000055 (Lockheed Martin Librascope Corporation), 2039333-25 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier).
Key specifications for L505000055: Bushing Length: 0.380 INCHES MAXIMUM IN; Reset Method: MANUAL; Internal Trip Release Configuration: SERIES TRIP SINGLE LOCATION; Operating Voltage Type and Rating Per Pole in Volts: 240.0 AC SINGLE LOCATION. 30 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.