The Circuit Breaker, cataloged under National Stock Number 5925-01-534-3129, is classified within Federal Supply Class 5925 (Circuit Breakers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Serco Limited. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5925-01-534-3129 |
| Primary Part Number | M39019/01-249S |
| Item Name | Circuit Breaker |
| FSC / FSG | 5925 / 59 — Circuit Breakers |
| Manufacturer | Serco Limited |
| Status | ACTIVE |
| Bushing Length | 0.332 INCHES MINIMUM AND 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 AND 50.0 DC SINGLE LOCATION |
| Mounting Facility Type and Quantity | 1 THREADED BUSHING |
| Actuator Position Designation | AT POLE ONE |
| Thread Tolerance Class | 2A EXTERNAL A |
| Frequency in Hertz | 60.0 OR 400.0 SINGLE LOCATION |
| Unpackaged Unit Weight | 50.000 GRAMS NOMINAL G |
| Body Style | SINGLE POLE TYPE |
| Ultimate Trip Rating of Continuous Current Rating Per Pole in Percent | 135.0 SINGLE LOCATION |
| Circuit Protection Type | OVERCURRENT SINGLE LOCATION |
| Body Width | 0.625 INCHES MAXIMUM IN |
| Pole Quantity | 1 |
| Mounting Surface to Terminal End Distance | 1.810 INCHES MAXIMUM IN |
| Maximum Continuous Load Current Rating Per Pole | 10.0 AMPERES AC AND 10.0 AMPERES DC SINGLE LOCATION |
| Trip Release Characteristic | TIME DELAY 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 | 0.500 MINIMUM AT 200 PCT AND 9.000 MAXIMUM AT 200 PCT SINGLE LOCATION |
| Manual Actuator Type and Quantity | 1 TOGGLE |
| Inclosure Protection Type for Which Designed | CORROSION RESISTANT AND FUNGUS RESISTANT AND MOISTURE RESISTANT AND WATER RESISTANT |
| Thread Quantity Per Inch | 32 |
| Actuator Function | TRIP-RESET |
| Terminal Type and Quantity | 2 TAB W/SCREW |
| Main Contact Tripping Mechanism Type | TRIP FREE |
| Thread Series Designator | UNEF |
| Trip Release Method | MAGNETIC SINGLE LOCATION |
| 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 |
|---|---|
| M39019/01-249S | Serco Limited (GBR) |
| Reference | Meaning |
|---|---|
| MIL-PRF-39019/1 | 4/1 Identification reference U.S. Government activity |
| M39019/01-249S | 2/2 Government specification standardization U.S. Government activity |
NSN 5925-01-534-3129 is a Circuit Breaker, manufactured by Serco Limited, classified under FSC 5925, Circuit Breakers. Status: active.
NSN 5925-01-534-3129 has 1 manufacturer part number on file: M39019/01-249S (Serco Limited).
Key specifications for M39019/01-249S: Bushing Length: 0.332 INCHES MINIMUM AND 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 AND 50.0 DC SINGLE LOCATION. 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.