The Circuit Breaker, cataloged under National Stock Number 5925-01-040-4042, is classified within Federal Supply Class 5925 (Circuit Breakers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Lockheed Martin Corporation Div Rms - Mitchel Field. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5925-01-040-4042 |
| Primary Part Number | 1603434-21 |
| Item Name | Circuit Breaker |
| FSC / FSG | 5925 / 59 — Circuit Breakers |
| Manufacturer | Lockheed Martin Corporation Div Rms - Mitchel Field |
| Status | ACTIVE |
| Bushing Length | 0.380 INCHES MAXIMUM IN |
| Reset Method | MANUAL |
| Internal Trip Release Configuration | SERIES TRIP ALL LOCATIONS |
| Operating Voltage Type and Rating Per Pole in Volts | 240.0 AC ALL LOCATIONS |
| Mounting Facility Type and Quantity | 1 THREADED BUSHING WITH PANEL SEAL |
| Actuator Position Designation | BETWEEN POLE ONE AND TWO |
| Switch Terminal Type | TAB, SOLDER LUG |
| Frequency in Hertz | 400.0 ALL LOCATIONS |
| Center to Center Distance Between Terminals Parallel to Width | 0.625 INCHES NOMINAL IN |
| Body Style | MULTIPOLE-SINGLE ACTUATOR TYPE |
| Switch Voltage Rating and Type in Volts | 120.0 AC AND 50.0 DC |
| Ultimate Trip Rating of Continuous Current Rating Per Pole in Percent | 115.0 ALL LOCATIONS |
| Switch Location and Position Designation | INTERNAL AT POLE TWO |
| Circuit Protection Type | OVERCURRENT ALL LOCATIONS |
| Body Width | 1.250 INCHES MAXIMUM IN |
| Pole Quantity | 2 |
| Mounting Surface to Terminal End Distance | 1.780 INCHES MAXIMUM IN |
| Maximum Continuous Load Current Rating Per Pole | 500.0 MILLIAMPERES AC ALL LOCATIONS |
| Trip Release Characteristic | TIME DELAY ALL LOCATIONS |
| Maximum Interrupting Capacity Current Type and Rating Per Pole in Amps | 300.0 AC ALL LOCATIONS |
| Nominal Thread Size | 0.375 INCHES IN |
| Body Length | 1.500 INCHES MAXIMUM IN |
| Trip Delay Time in Seconds Per Rated Continuous Current | 0.400 MINIMUM AT 200 PCT AND 9.000 MAXIMUM AT 200 PCT ALL LOCATIONS |
| Manual Actuator Type and Quantity | 1 TOGGLE |
| Switch Current Rating and Type in Amps | 0.5 AC AND 0.5 DC |
| Inclosure Protection Type for Which Designed | HERMETICALLY SEALED |
| Switch Contact Arrangement | SINGLE POLE, DOUBLE THROW |
| Thread Quantity Per Inch | 32 |
| Actuator Function | TRIP-RESET |
| Terminal Type and Quantity | 4 WIRE HOOK |
| 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 |
|---|---|
| 1603434-21 | Lockheed Martin Corporation Div Rms - Mitchel Field (USA) |
| Reference | Meaning |
|---|---|
| AP12R214-21 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5925-01-040-4042 is a Circuit Breaker, manufactured by Lockheed Martin Corporation Div Rms - Mitchel Field, classified under FSC 5925, Circuit Breakers. Status: active.
NSN 5925-01-040-4042 has 1 manufacturer part number on file: 1603434-21 (Lockheed Martin Corporation Div Rms - Mitchel Field).
Key specifications for 1603434-21: Bushing Length: 0.380 INCHES MAXIMUM IN; Reset Method: MANUAL; Internal Trip Release Configuration: SERIES TRIP ALL LOCATIONS; Operating Voltage Type and Rating Per Pole in Volts: 240.0 AC ALL LOCATIONS. 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.