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Technical Data Sheet
PartsTable / MRO / 12957123
12957123 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

The CIRCUIT BREAKER is a the manufacturer industrial component. Key specifications include material: PLASTIC CASE, body_style: SINGLE POLE TYPE, body_width: 0.750 INCHES NOMINAL IN, reset_method: AUTOMATIC, storage_type: GENERAL PURPOSE WAREHOUSE, overall_length: 2.190 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5925-00-929-7719, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
MRO→ MRO_GENERAL→ 12957123
NSN: 5925-00-929-7719
FSC: 5925
CAGE: 19200 — COMBAT CAPABILITIES DEVELOPMENT COMMAND (CCDC) ARMAMENTS CENTER DBA CCDC DIV LOGISTICS RESEARCH AND ENGINEERING DIRECTORATE (USA)
SPECIFICATIONS
materialPLASTIC CASE
body_styleSINGLE POLE TYPE
body_width0.750 INCHES NOMINAL IN
reset_methodAUTOMATIC
storage_typeGENERAL PURPOSE WAREHOUSE
pole_quantity1
overall_length2.190 INCHES NOMINAL IN
fragility_factorMODERATELY RUGGED
nominal_thread_size0.138 INCHES IN
trip_release_methodTHERMAL SINGLE LOCATION
circuit_protection_typeOVERCURRENT SINGLE LOCATION
end_item_identificationMULTIPLE LAUNCH ROCKET SYSTEM (MLRS)
NSN5925-00-929-7719
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CIRCUIT BREAKER TITLE COMPONENT PN 12957123 MFR CIRCUIT BREAKER
KEY FEATURES
•
TEST DATA DOCUMENT: 58536-AA55571 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.).
•
TRIP RELEASE METHOD: THERMAL SINGLE LOCATION
•
INCLOSURE PROTECTION TYPE FOR WHICH DESIGNED: VIBRATION RESISTANT AND SHOCK RESISTANT AND SALT SPRAY PROOF AND FUNGUS RESISTANT
•
MAXIMUM INTERRUPTING CAPACITY CURRENT TYPE AND RATING PER POLE IN AMPS: 575.0 DC SINGLE LOCATION
•
OPERATING VOLTAGE TYPE AND RATING PER POLE IN VOLTS: 28.0 DC SINGLE LOCATION
•
TRIP DELAY TIME IN SECONDS PER RATED CONTINUOUS CURRENT: 8.000 MINIMUM AT 200 PCT AND 50.000 MAXIMUM AT 200 PCT SINGLE LOCATION
•
TERMINAL TYPE AND QUANTITY: 2 TAB W/SCREW
•
CIRCUIT PROTECTION TYPE: OVERCURRENT SINGLE LOCATION
TECHNICAL CHARACTERISTICS (FLIS)
TEST DATA DOCUMENT58536-AA55571 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.).
TRIP RELEASE METHODTHERMAL SINGLE LOCATION
INCLOSURE PROTECTION TYPE FOR WHICH DESIGNEDVIBRATION RESISTANT AND SHOCK RESISTANT AND SALT SPRAY PROOF AND FUNGUS RESISTANT
MAXIMUM INTERRUPTING CAPACITY CURRENT TYPE AND RATING PER POLE IN AMPS575.0 DC SINGLE LOCATION
OPERATING VOLTAGE TYPE AND RATING PER POLE IN VOLTS28.0 DC SINGLE LOCATION
TRIP DELAY TIME IN SECONDS PER RATED CONTINUOUS CURRENT8.000 MINIMUM AT 200 PCT AND 50.000 MAXIMUM AT 200 PCT SINGLE LOCATION
TERMINAL TYPE AND QUANTITY2 TAB W/SCREW
CIRCUIT PROTECTION TYPEOVERCURRENT SINGLE LOCATION
TRIP RELEASE CHARACTERISTICTIME DELAY SINGLE LOCATION
ULTIMATE TRIP RATING OF CONTINUOUS CURRENT RATING PER POLE IN PERCENT138.0 SINGLE LOCATION
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
PSA10Interchangeable
interchangeable cross-reference
interchangeable
AA55571/05-001Interchangeable
interchangeable cross-reference
interchangeable
A-A-55571/5Interchangeable
interchangeable cross-reference
interchangeable
MIL-C-13516-5Interchangeable
interchangeable cross-reference
interchangeable
MS39066-1Interchangeable
interchangeable cross-reference
interchangeable
M13516/5-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 12957123?
12957123 is a CIRCUIT BREAKER. It is classified as a MRO (MRO_GENERAL).
What parts can replace 12957123?
There are 20 known substitutes for 12957123: PSA10, AA55571/05-001, A-A-55571/5 and 17 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 12957123?
12957123 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5925-00-929-7719. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026