The Circuit Breaker, cataloged under National Stock Number 5925-01-248-5793, is classified within Federal Supply Class 5925 (Circuit Breakers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is U S Dept of Transportation Federal Aviation Administration. Government technical data includes 28 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5925-01-248-5793 |
| Primary Part Number | AM3-A39-A-40-252 |
| Item Name | Circuit Breaker |
| FSC / FSG | 5925 / 59 — Circuit Breakers |
| Manufacturer | U S Dept of Transportation Federal Aviation Administration |
| Status | ACTIVE |
| Reset Method | MANUAL |
| Operating Voltage Type and Rating Per Pole in Volts | 250.0 AC ALL LOCATIONS |
| Mounting Facility Type and Quantity | 6 THREADED STUD(S)6 THREADED STUD(S) |
| Actuator Position Designation | AT EACH POLE |
| Ultimate Trip Time Per Pole in Seconds | 10.000 NOMINAL ALL LOCATIONS |
| Frequency in Hertz | 60.0 ALL LOCATIONS |
| Center to Center Distance Between Terminals Parallel to Width | 0.740 INCHES MINIMUM AND 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM0.760 INCHES MAXIMUM IN |
| Fragility Factor | MODERATELY RUGGEDMODERATELY RUGGED |
| Body Style | MULTIPOLE-MULTIPLE ACTUATOR TYPEMULTIPOLE-MULTIPLE ACTUATOR TYPE |
| Ultimate Trip Rating of Continuous Current Rating Per Pole in Percent | 130.0 ALL LOCATIONS |
| External Actuator Linkage Arrangement | ONE, TWO, AND THREE LINKED |
| Distance Between Centerlines of Mounting Facilities Parallel to Body Length | 2.052 INCHES MINIMUM AND 2.052 INCHES MINIMUM AND 2.072 INCHES MAXIMUM2.072 INCHES MAXIMUM IN |
| Arc Quenching Method | MAGNETIC BLOWOUTMAGNETIC BLOWOUT |
| Circuit Protection Type | OVERCURRENT ALL LOCATIONS |
| Body Width | 2.240 INCHES MINIMUM AND 2.240 INCHES MINIMUM AND 2.510 INCHES MAXIMUM2.510 INCHES MAXIMUM IN |
| Storage Type | GENERAL PURPOSE WAREHOUSEGENERAL PURPOSE WAREHOUSE |
| Pole Quantity | 33 |
| Mounting Surface to Terminal End Distance | 2.461 INCHES MINIMUM AND 2.461 INCHES MINIMUM AND 2.481 INCHES MAXIMUM2.481 INCHES MAXIMUM IN |
| Maximum Continuous Load Current Rating Per Pole | 40.0 AMPERES AC ALL LOCATIONS |
| Trip Release Characteristic | INSTANTANEOUS ALL LOCATIONS |
| Maximum Interrupting Capacity Current Type and Rating Per Pole in Amps | 5000.0 AC ALL LOCATIONS |
| Nominal Thread Size | 0.138 INCHES IN |
| Body Length | 2.490 INCHES MINIMUM AND 2.490 INCHES MINIMUM AND 2.510 INCHES MAXIMUM2.510 INCHES MAXIMUM IN |
| Manual Actuator Type and Quantity | 3 TOGGLE |
| Distance Between Centerlines of Mounting Facilities Parallel to Body Width | 0.740 INCHES MINIMUM AND 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM0.760 INCHES MAXIMUM IN |
| Inclosure Protection Type for Which Designed | DUSTPROOF |
| Material | PLASTIC CASE |
| 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 | N |
| Part Number | Manufacturer |
|---|---|
| AM3-A39-A-40-252 PRIMARY | U S Dept of Transportation Federal Aviation Administration (USA) |
| Reference | Meaning |
|---|---|
| AM3-A39-A-40-252 | 5/9 Secondary reference Eaton Corp Heinemann Products Commercial Controls Div |
| AM3R-A39-LC07D-A52 | 5/9 Secondary reference Wesco Distribution, Inc. Div Carlton-Bates Company |
NSN 5925-01-248-5793 is a Circuit Breaker, manufactured by U S Dept of Transportation Federal Aviation Administration, classified under FSC 5925, Circuit Breakers. Status: active.
NSN 5925-01-248-5793 has 1 manufacturer part number on file: AM3-A39-A-40-252 (U S Dept of Transportation Federal Aviation Administration).
Key specifications for AM3-A39-A-40-252: Reset Method: MANUAL; Operating Voltage Type and Rating Per Pole in Volts: 250.0 AC ALL LOCATIONS; Mounting Facility Type and Quantity: 6 THREADED STUD(S)6 THREADED STUD(S); Actuator Position Designation: AT EACH POLE. 28 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.