The Circuit Breaker, cataloged under National Stock Number 5925-01-441-8987, is classified within Federal Supply Class 5925 (Circuit Breakers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Leonardo Uk Ltd. Government technical data includes 27 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5925-01-441-8987 |
| Primary Part Number | MDS4371-29 |
| Item Name | Circuit Breaker |
| FSC / FSG | 5925 / 59 — Circuit Breakers |
| Manufacturer | Leonardo Uk Ltd |
| Status | ACTIVE |
| Bushing Length | 0.250 INCHES NOMINAL IN |
| Reset Method | MANUAL |
| Internal Trip Release Configuration | SERIES TRIP ALL LOCATIONS |
| Operating Voltage Type and Rating Per Pole in Volts | 120.0 AC ALL LOCATIONS |
| Mounting Facility Type and Quantity | 1 THREADED BUSHING |
| Frequency in Hertz | 400.0 ALL LOCATIONS |
| Center to Center Distance Between Terminals Parallel to Width | 0.688 INCHES NOMINAL IN |
| Body Style | MULTIPOLE-SINGLE ACTUATOR TYPE |
| Ultimate Trip Rating of Continuous Current Rating Per Pole in Percent | 138.0 ALL LOCATIONS |
| Circuit Protection Type | OVERCURRENT ALL LOCATIONS |
| Body Width | 2.160 INCHES MAXIMUM IN |
| Body Height | 2.170 INCHES MAXIMUM IN |
| Pole Quantity | 3 |
| Maximum Continuous Load Current Rating Per Pole | 35.0 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 | 0.469 INCHES IN |
| Body Length | 1.312 INCHES MAXIMUM IN |
| Trip Delay Time in Seconds Per Rated Continuous Current | 10.000 MINIMUM AT 200 PCT AND 70.000 MAXIMUM AT 200 PCT ALL LOCATIONS |
| Thread Quantity Per Inch | 32 |
| Material | PLASTIC CASE |
| Trip Release Ambient Temp Rating | 25.0 CELSIUS MAXIMUM ALL LOCATIONS DEGC |
| Terminal Type and Quantity | 6 SCREW |
| Main Contact Tripping Mechanism Type | TRIP FREE |
| Thread Series Designator | UNS |
| Trip Release Method | THERMAL ALL LOCATIONS |
| Center to Center Distance Between Terminals Parallel to Length | 0.750 INCHES MAXIMUM IN |
| 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 |
|---|---|
| MDS4371-29 | Leonardo Uk Ltd (GBR) |
| Reference | Meaning |
|---|---|
| 1536-010-35 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5925-01-441-8987 is a Circuit Breaker, manufactured by Leonardo Uk Ltd, classified under FSC 5925, Circuit Breakers. Status: active.
NSN 5925-01-441-8987 has 1 manufacturer part number on file: MDS4371-29 (Leonardo Uk Ltd).
Key specifications for MDS4371-29: Bushing Length: 0.250 INCHES NOMINAL IN; Reset Method: MANUAL; Internal Trip Release Configuration: SERIES TRIP ALL LOCATIONS; Operating Voltage Type and Rating Per Pole in Volts: 120.0 AC ALL LOCATIONS. 27 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.