The Circuit Breaker, cataloged under National Stock Number 5925-01-043-4852, is classified within Federal Supply Class 5925 (Circuit Breakers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Leonardo S.p.a. - Electronics Division - Defence Business Area. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5925-01-043-4852 |
| Primary Part Number | 870SS0252 |
| Item Name | Circuit Breaker |
| FSC / FSG | 5925 / 59 — Circuit Breakers |
| Manufacturer | Leonardo S.p.a. - Electronics Division - Defence Business Area |
| Status | ACTIVE |
| Bushing Length | 0.187 INCHES MINIMUM AND 0.249 INCHES MAXIMUM IN |
| Reset Method | MANUAL |
| Internal Trip Release Configuration | RELAY TRIP SINGLE LOCATION |
| Operating Voltage Type and Rating Per Pole in Volts | 200.0 AC AND 28.0 DC SINGLE LOCATION |
| Mounting Facility Type and Quantity | 2 THREADED HOLE(S) |
| Actuator Position Designation | AT POLE ONE |
| Frequency in Hertz | 400.0 SINGLE LOCATION |
| Unpackaged Unit Weight | 0.200 POUNDS NOMINAL LBS |
| Fragility Factor | MODERATELY RUGGED |
| Body Style | SINGLE POLE TYPE |
| Ultimate Trip Rating of Continuous Current Rating Per Pole in Percent | 138.0 SINGLE LOCATION |
| Distance Between Centerlines of Mounting Facilities Parallel to Body Length | 1.800 INCHES MINIMUM AND 1.820 INCHES MAXIMUM IN |
| Circuit Protection Type | OVERCURRENT SINGLE LOCATION |
| Body Width | 0.760 INCHES MAXIMUM IN |
| Storage Type | GENERAL PURPOSE WAREHOUSE |
| Pole Quantity | 1 |
| Mounting Surface to Terminal End Distance | 2.370 INCHES NOMINAL IN |
| Maximum Continuous Load Current Rating Per Pole | 50.0 AMPERES AC AND 50.0 AMPERES DC SINGLE LOCATION |
| Trip Release Characteristic | TIME DELAY SINGLE LOCATION |
| Maximum Interrupting Capacity Current Type and Rating Per Pole in Amps | 5000.0 AC AND 5000.0 DC SINGLE LOCATION |
| Nominal Thread Size | 0.138 INCHES IN |
| Specification/standard Data | 96906-MS24571 GOVERNMENT STANDARD |
| Body Length | 2.189 INCHES MAXIMUM IN |
| Trip Delay Time in Seconds Per Rated Continuous Current | 28.000 MINIMUM AT 200 PCT AND 55.000 MAXIMUM AT 200 PCT SINGLE LOCATION |
| Manual Actuator Type and Quantity | 1 PUSH-PULL |
| Inclosure Protection Type for Which Designed | CORROSION RESISTANT AND HERMETICALLY SEALED AND EXPLOSION PROOF AND HUMIDITY RESISTANT AND SALT SPRAY PROOF AND SAND RESISTANT AND DUSTPROOF AND VIBRATIONPROOF AND SHOCK RESISTANT AND FUNGUS RESISTANT |
| Test Data Document | 81349-MIL-C-27715 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.). |
| Thread Quantity Per Inch | 32 |
| Actuator Function | TRIP-RESET |
| 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 |
|---|---|
| 870SS0252 | Leonardo S.p.a. - Electronics Division - Defence Business Area (ITA) |
| Reference | Meaning |
|---|---|
| MIL-C-27715 | 5/9 Secondary reference U.S. Government activity |
| MS24571-50V | 2/2 Government specification standardization U.S. Government activity |
| MIL-DTL-27715 | 4/1 Identification reference U.S. Government activity |
NSN 5925-01-043-4852 is a Circuit Breaker, manufactured by Leonardo S.p.a. - Electronics Division - Defence Business Area, classified under FSC 5925, Circuit Breakers. Status: active.
NSN 5925-01-043-4852 has 1 manufacturer part number on file: 870SS0252 (Leonardo S.p.a. - Electronics Division - Defence Business Area).
1 possible match (shared part number, not a government interchangeability claim): 5925-01-043-5810. Verify interchangeability with system specifications before substitution.
Key specifications for 870SS0252: Bushing Length: 0.187 INCHES MINIMUM AND 0.249 INCHES MAXIMUM IN; Reset Method: MANUAL; Internal Trip Release Configuration: RELAY TRIP SINGLE LOCATION; Operating Voltage Type and Rating Per Pole in Volts: 200.0 AC AND 28.0 DC SINGLE LOCATION. 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.