The Circuit Breaker, cataloged under National Stock Number 5925-01-600-8047, is classified within Federal Supply Class 5925 (Circuit Breakers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Cooper Bussmann, Llc. Government technical data includes 24 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5925-01-600-8047 |
| Primary Part Number | 121B30-B2M |
| Item Name | Circuit Breaker |
| FSC / FSG | 5925 / 59 — Circuit Breakers |
| Manufacturer | Cooper Bussmann, Llc |
| Status | ACTIVE |
| Reset Method | AUTOMATIC |
| Internal Trip Release Configuration | SERIES TRIP ALL LOCATIONS |
| Operating Voltage Type and Rating Per Pole in Volts | 14.0 DC AND 28.0 DC ALL LOCATIONS |
| Mounting Facility Type and Quantity | 2 UNTHREADED HOLE(S) |
| Body Style | SINGLE POLE TYPE |
| Distance Between Centerlines of Mounting Facilities Parallel to Body Length | 1.560 INCHES NOMINAL IN |
| Circuit Protection Type | OVERCURRENT ALL LOCATIONS |
| Body Width | 0.790 INCHES NOMINAL IN |
| Body Height | 0.640 INCHES NOMINAL IN |
| Unthreaded Mounting Hole Diameter | 0.196 INCHES NOMINAL IN |
| Trip Release Duty Cycle | CONTINUOUS ALL LOCATIONS |
| Pole Quantity | 1 |
| Mounting Surface to Terminal End Distance | 1.250 INCHES NOMINAL IN |
| Maximum Continuous Load Current Rating Per Pole | 30.0 AMPERES DC ALL LOCATIONS |
| Trip Release Characteristic | TIME DELAY ALL LOCATIONS |
| Maximum Interrupting Capacity Current Type and Rating Per Pole in Amps | 1.5 DC ALL LOCATIONS |
| Nominal Thread Size | 0.190 INCHES IN |
| Body Length | 1.240 INCHES NOMINAL IN |
| Thread Quantity Per Inch | 32 |
| Trip Release Ambient Temp Rating | -40.0 FAHRENHEIT MINIMUM AND 185.0 FAHRENHEIT MAXIMUM ALL LOCATIONS DEGF |
| Thread Series Designator | UNF |
| Boss Height | 0.560 INCHES NOMINAL IN |
| Trip Release Method | THERMAL ALL LOCATIONS |
| Center to Center Distance Between Terminals Parallel to Length | 0.690 INCHES NOMINAL 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 |
|---|---|
| 121B30-B2M PRIMARY | Cooper Bussmann, Llc (USA) |
| CB-30A | Customair Conditioning Pty Ltd Customair Automotive Air (AUS) |
| Reference | Meaning |
|---|---|
| 121B30-B2M | 5/9 Secondary reference Mcgraw Edison Co Usd Opns Sub of Cooper Industries |
NSN 5925-01-600-8047 is a Circuit Breaker, manufactured by Cooper Bussmann, Llc, classified under FSC 5925, Circuit Breakers. Status: active.
NSN 5925-01-600-8047 has 2 manufacturer part numbers on file: 121B30-B2M (Cooper Bussmann, Llc), CB-30A (Customair Conditioning Pty Ltd Customair Automotive Air).
Key specifications for 121B30-B2M: Reset Method: AUTOMATIC; Internal Trip Release Configuration: SERIES TRIP ALL LOCATIONS; Operating Voltage Type and Rating Per Pole in Volts: 14.0 DC AND 28.0 DC ALL LOCATIONS; Mounting Facility Type and Quantity: 2 UNTHREADED HOLE(S). 24 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.