The Circuit Breaker, cataloged under National Stock Number 5925-00-258-7121, is classified within Federal Supply Class 5925 (Circuit Breakers) of the Electrical and Electronic Equipment Components group. Government technical data includes 29 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5925-00-258-7121 |
| Item Name | Circuit Breaker |
| FSC / FSG | 5925 / 59 — Circuit Breakers |
| Status | ACTIVE |
| Reset Method | MANUAL |
| Internal Trip Release Configuration | SERIES TRIP SINGLE LOCATION |
| Operating Voltage Type and Rating Per Pole in Volts | 30.0 AC AND 30.0 DC SINGLE LOCATION |
| Mounting Facility Type and Quantity | 2 THREADED HOLE(S) |
| Actuator Position Designation | AT POLE ONE |
| Frequency in Hertz | 60.0 SINGLE LOCATION |
| Unpackaged Unit Weight | 1.850 OUNCES NOMINAL OZ |
| Fragility Factor | MODERATELY RUGGED |
| Body Style | SINGLE POLE TYPE |
| Ultimate Trip Rating of Continuous Current Rating Per Pole in Percent | 122.0 SINGLE LOCATION |
| Distance Between Centerlines of Mounting Facilities Parallel to Body Length | 1.813 INCHES NOMINAL IN |
| Arc Quenching Method | AIR |
| Circuit Protection Type | OVERCURRENT SINGLE LOCATION |
| Body Width | 0.766 INCHES NOMINAL IN |
| Storage Type | GENERAL PURPOSE WAREHOUSE |
| Pole Quantity | 1 |
| Mounting Surface to Terminal End Distance | 1.438 INCHES NOMINAL IN |
| Maximum Continuous Load Current Rating Per Pole | 5.0 AMPERES AC AND 5.0 AMPERES DC SINGLE LOCATION |
| Trip Release Characteristic | TIME DELAY SINGLE LOCATION |
| Maximum Interrupting Capacity Current Type and Rating Per Pole in Amps | 100.0 AC AND 100.0 DC SINGLE LOCATION |
| Nominal Thread Size | 0.164 INCHES IN |
| Body Length | 2.203 INCHES NOMINAL IN |
| Trip Delay Time in Seconds Per Rated Continuous Current | 800.000 NOMINAL AT 125 PCT AND 50.000 NOMINAL AT 200 PCT AND 12.000 NOMINAL AT 300 PCT SINGLE LOCATION |
| Manual Actuator Type and Quantity | 1 TOGGLE |
| Material | PLASTIC CASE |
| Actuator Function | TRIP-RESET |
| Trip Release Ambient Temp Rating | 25.0 CELSIUS NOMINAL SINGLE LOCATION DEGC |
| Terminal Type and Quantity | 2 SCREW |
| Main Contact Tripping Mechanism Type | TRIP FREE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Hazardous per DLA record (HMIC Y) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 6363-1-5 | 3/1 Design control — primary reference U.S. Government activity |
| C6363-1-5 | 5/9 Secondary reference U.S. Government activity |
NSN 5925-00-258-7121 is a Circuit Breaker, classified under FSC 5925, Circuit Breakers. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 5925-00-838-8668, 5925-01-270-5255. Verify interchangeability with system specifications before substitution.
Key specifications for 5925-00-258-7121: Reset Method: MANUAL; Internal Trip Release Configuration: SERIES TRIP SINGLE LOCATION; Operating Voltage Type and Rating Per Pole in Volts: 30.0 AC AND 30.0 DC SINGLE LOCATION; Mounting Facility Type and Quantity: 2 THREADED HOLE(S). 29 specifications are documented in the U.S. Government catalog.
Hazardous per DLA record (HMIC Y). 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.