The Circuit Breaker, cataloged under National Stock Number 5925-01-217-1641, is classified within Federal Supply Class 5925 (Circuit Breakers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Lockheed Martin Services, Llc. Government technical data includes 30 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5925-01-217-1641 |
| Primary Part Number | 7939979-2 |
| Item Name | Circuit Breaker |
| FSC / FSG | 5925 / 59 — Circuit Breakers |
| Manufacturer | Lockheed Martin Services, Llc |
| Status | ACTIVE |
| Reset Method | MANUAL |
| Internal Trip Release Configuration | SERIES TRIP ALL LOCATIONS |
| Operating Voltage Type and Rating Per Pole in Volts | 250.0 AC ALL LOCATIONS |
| Mounting Facility Type and Quantity | 8 THREADED HOLE(S) |
| Actuator Position Designation | AT EACH POLE |
| Frequency in Hertz | 60.0 ALL LOCATIONS |
| Center to Center Distance Between Terminals Parallel to Width | 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN |
| Fragility Factor | MODERATELY RUGGED |
| Body Style | MULTIPOLE-MULTIPLE ACTUATOR TYPE |
| Ultimate Trip Rating of Continuous Current Rating Per Pole in Percent | 125.0 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 2.072 INCHES MAXIMUM IN |
| Arc Quenching Method | MAGNETIC BLOWOUT |
| Circuit Protection Type | OVERCURRENT ALL LOCATIONS |
| Body Width | 2.990 INCHES MINIMUM AND 3.010 INCHES MAXIMUM IN |
| Storage Type | GENERAL PURPOSE WAREHOUSE |
| Pole Quantity | 4 |
| Mounting Surface to Terminal End Distance | 2.461 INCHES MINIMUM AND 2.481 INCHES MAXIMUM IN |
| Maximum Continuous Load Current Rating Per Pole | 20.0 AMPERES AC ALL LOCATIONS |
| Trip Release Characteristic | TIME DELAY ALL LOCATIONS |
| Maximum Interrupting Capacity Current Type and Rating Per Pole in Amps | 1000.0 AC ALL LOCATIONS |
| Nominal Thread Size | 0.138 INCHES IN |
| Body Length | 2.490 INCHES MINIMUM AND 2.510 INCHES MAXIMUM IN |
| Trip Delay Time in Seconds Per Rated Continuous Current | 10.000 MINIMUM AT 200 PCT AND 100.000 MAXIMUM AT 200 PCT ALL LOCATIONS |
| Manual Actuator Type and Quantity | 4 TOGGLE |
| Distance Between Centerlines of Mounting Facilities Parallel to Body Width | 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN |
| Inclosure Protection Type for Which Designed | FUNGUS RESISTANT AND MOISTURE RESISTANT |
| Thread Quantity Per Inch | 32 |
| 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 | X |
| Part Number | Manufacturer |
|---|---|
| 7939979-2 | Lockheed Martin Services, Llc (USA) |
| Reference | Meaning |
|---|---|
| UPL-1111-1-66F-203 | 5/2 Secondary reference U.S. Government activity |
| AM4-A8-A-20-10 | 3/9 Design control — primary reference Eaton Corp Heinemann Products Commercial Controls Div |
NSN 5925-01-217-1641 is a Circuit Breaker, manufactured by Lockheed Martin Services, Llc, classified under FSC 5925, Circuit Breakers. Status: active.
NSN 5925-01-217-1641 has 1 manufacturer part number on file: 7939979-2 (Lockheed Martin Services, Llc).
Key specifications for 7939979-2: Reset Method: MANUAL; Internal Trip Release Configuration: SERIES TRIP ALL LOCATIONS; Operating Voltage Type and Rating Per Pole in Volts: 250.0 AC ALL LOCATIONS; Mounting Facility Type and Quantity: 8 THREADED HOLE(S). 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.