PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21321Circuit Breaker

L3 Technologies, Inc. Dba Insight Technology Division Div Insight Technology Division · NSN 5925-00-072-6934 · FSC 5925 · No Item Name Available
Verified by PartsTable
NSN 5925-00-072-6934 — this item is cataloged by the U.S. Government under National Stock Number 5925-00-072-6934. Primary manufacturer part number: 21321.
Features
  • Circuit Breaker — FSC 5925
  • Maximum Continuous Load Current Rating Per Pole: 100.0 AMPERES AC ALL LOCATIONS
  • Trip Release Method: MAGNETIC ALL LOCATIONS
  • Ultimate Trip Rating of Continuous Current Rating Per Pole in Percent: 125.0 ALL LOCATIONS
  • Trip Release Characteristic: INSTANTANEOUS ALL LOCATIONS
  • Reset Method: MANUAL
  • Circuit Protection Type: OVERCURRENT ALL LOCATIONS
  • Terminal Type and Quantity: 4 SCREW
Applications
  • Applications requiring Plastic Case construction
General Description

The Circuit Breaker, cataloged under National Stock Number 5925-00-072-6934, is classified within Federal Supply Class 5925 (No Item Name Available) of the Electrical and Electronic Equipment Components group. The primary manufacturer of record is L3 Technologies, Inc. Dba Insight Technology Division Div Insight Technology Division. Government technical data includes 22 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5925-00-072-6934
Primary Part Number21321
Item NameCircuit Breaker
FSC / FSG5925 / 59 — No Item Name Available
ManufacturerL3 Technologies, Inc. Dba Insight Technology Division Div Insight Technology Division
StatusACTIVE
Maximum Continuous Load Current Rating Per Pole100.0 AMPERES AC ALL LOCATIONS
Trip Release MethodMAGNETIC ALL LOCATIONS
Ultimate Trip Rating of Continuous Current Rating Per Pole in Percent125.0 ALL LOCATIONS
Trip Release CharacteristicINSTANTANEOUS ALL LOCATIONS
Reset MethodMANUAL
Circuit Protection TypeOVERCURRENT ALL LOCATIONS
Terminal Type and Quantity4 SCREW
Storage TypeGENERAL PURPOSE WAREHOUSE
Pole Quantity2
Mounting Facility Type and Quantity4 UNTHREADED HOLE(S)
Unthreaded Mounting Hole Diameter0.188 INCHES NOMINAL IN
Fragility FactorMODERATELY RUGGED
Arc Quenching MethodMAGNETIC BLOWOUT
MaterialPLASTIC CASE
Actuator FunctionTRIP W/SEPARATE RESET
Actuator Position DesignationAT POLE ONE
Internal Trip Release ConfigurationSERIES TRIP ALL LOCATIONS
Maximum Interrupting Capacity Current Type and Rating Per Pole in Amps10000.0 AC ALL LOCATIONS
Inclosure Protection Type for Which DesignedGENERAL PURPOSE
Operating Voltage Type and Rating Per Pole in Volts600.0 AC ALL LOCATIONS
Main Contact Tripping Mechanism TypeTRIP FREE
Frequency in Hertz60.0 ALL LOCATIONS
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5935-00-018-3472124-0116-001 INTERCHANGEABLE
Socket,plug-in Electronic Compon
Viking Technologies, Ltd.
9540-00-261-5107 INTERCHANGEABLE
Angle,structural
5120-00-473-64765120-00-473-6476 INTERCHANGEABLE
Wrench,adjustable
General Services Administration Federal Supply Service
9540-00-540-5942 INTERCHANGEABLE
Angle,structural
9540-00-596-3012 INTERCHANGEABLE
Angle,structural
4820-01-410-801221321-001 INTERCHANGEABLE
Valve,linear,directional Control
Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace
4820-01-706-027721321-850-1 INTERCHANGEABLE
Sleeve,slide
Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace
5340-01-723-823221321-1007-1 INTERCHANGEABLE
Connecting Link,rigid
Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace
5340-01-723-890021321-1006-1 INTERCHANGEABLE
Holder,roller
Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace
5340-01-723-894121321-1004-1 INTERCHANGEABLE
Retainer,helical Compression Spr
Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace
Cross-Reference Index
Part NumberManufacturer
21321 L3 Technologies, Inc. Dba Insight Technology Division Div Insight Technology Division (USA)
21321 Varo Llc (USA)
Related Parts
5935-00-018-3472INTERCHANGEABLE
SOCKET,PLUG-IN ELECTRONIC COMPON
124-0116-001
9540-00-261-5107INTERCHANGEABLE
ANGLE,STRUCTURAL
5120-00-473-6476INTERCHANGEABLE
WRENCH,ADJUSTABLE
5120-00-473-6476
9540-00-540-5942INTERCHANGEABLE
ANGLE,STRUCTURAL
9540-00-596-3012INTERCHANGEABLE
ANGLE,STRUCTURAL
4820-01-410-8012INTERCHANGEABLE
VALVE,LINEAR,DIRECTIONAL CONTROL
21321-001
4820-01-706-0277INTERCHANGEABLE
SLEEVE,SLIDE
21321-850-1
5340-01-723-8232INTERCHANGEABLE
CONNECTING LINK,RIGID
21321-1007-1
5340-01-723-8900INTERCHANGEABLE
HOLDER,ROLLER
21321-1006-1
5340-01-723-8941INTERCHANGEABLE
RETAINER,HELICAL COMPRESSION SPR
21321-1004-1
3040-01-723-8965INTERCHANGEABLE
SHAFT,STRAIGHT
21321-1001-1
5340-01-723-8972INTERCHANGEABLE
STOP,MECHANICAL
21321-1016-1

Frequently Asked Questions

What is NSN 5925-00-072-6934?

NSN 5925-00-072-6934 is a Circuit Breaker, manufactured by L3 Technologies, Inc. Dba Insight Technology Division Div Insight Technology Division, classified under FSC 5925 (No Item Name Available). Status: active.

What are the part numbers for NSN 5925-00-072-6934?

NSN 5925-00-072-6934 has 2 cross-referenced part numbers: 21321 (L3 Technologies, Inc. Dba Insight Technology Division Div Insight Technology Division), 21321 (Varo Llc).

What NSN replaces 5925-00-072-6934?

There are 12 known substitutes for 5925-00-072-6934: 5935-00-018-3472, 9540-00-261-5107, 5120-00-473-6476 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 21321?

Key specifications for 21321: Maximum Continuous Load Current Rating Per Pole: 100.0 AMPERES AC ALL LOCATIONS; Trip Release Method: MAGNETIC ALL LOCATIONS; Ultimate Trip Rating of Continuous Current Rating Per Pole in Percent: 125.0 ALL LOCATIONS; Trip Release Characteristic: INSTANTANEOUS ALL LOCATIONS. 22 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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