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Technical Data Sheet
12MC1-203-21 ✓ 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: MULTIPOLE-MULTIPLE ACTUATOR TYPE, body_width: 1.530 INCHES NOMINAL IN, body_length: 2.530 INCHES NOMINAL IN, boss_height: 0.130 INCHES NOMINAL IN, reset_method: MANUAL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5925-00-925-5126, 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 12MC1-203-21
NSN: 5925-00-925-5126
FSC: 5925
CAGE: 82647 — SENSATA TECHNOLOGIES, INC. DIV SENSATA ATTLEBORO (USA)
SPECIFICATIONS
materialPLASTIC CASE
body_styleMULTIPOLE-MULTIPLE ACTUATOR TYPE
body_width1.530 INCHES NOMINAL IN
body_length2.530 INCHES NOMINAL IN
boss_height0.130 INCHES NOMINAL IN
reset_methodMANUAL
storage_typeGENERAL PURPOSE WAREHOUSE
pole_quantity2
actuator_functionTRIP-RESET
frequency_in_hertz400.0 ALL LOCATIONS
nominal_thread_size0.138 INCHES IN
trip_release_methodMAGNETIC ALL LOCATIONS
NSN5925-00-925-5126
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CIRCUIT BREAKER TITLE COMPONENT PN 12MC1-203-21 MFR CIRCUIT BREAKER
KEY FEATURES
TRIP RELEASE METHOD: MAGNETIC ALL LOCATIONS
TRIP DELAY TIME IN SECONDS PER RATED CONTINUOUS CURRENT: 3.000 MINIMUM AT 200 PCT AND 9.000 MAXIMUM AT 200 PCT ALL LOCATIONS
SWITCH CURRENT RATING AND TYPE IN AMPS: 5.0 AC
NOMINAL THREAD SIZE: 0.138 INCHES IN
MAXIMUM CONTINUOUS LOAD CURRENT RATING PER POLE: 20.8 AMPERES AC ALL LOCATIONS
ACTUATOR POSITION DESIGNATION: AT EACH POLE
MATERIAL: PLASTIC CASE
FREQUENCY IN HERTZ: 400.0 ALL LOCATIONS
TECHNICAL CHARACTERISTICS (FLIS)
TRIP RELEASE METHODMAGNETIC ALL LOCATIONS
TRIP DELAY TIME IN SECONDS PER RATED CONTINUOUS CURRENT3.000 MINIMUM AT 200 PCT AND 9.000 MAXIMUM AT 200 PCT ALL LOCATIONS
SWITCH CURRENT RATING AND TYPE IN AMPS5.0 AC
NOMINAL THREAD SIZE0.138 INCHES IN
MAXIMUM CONTINUOUS LOAD CURRENT RATING PER POLE20.8 AMPERES AC ALL LOCATIONS
ACTUATOR POSITION DESIGNATIONAT EACH POLE
MATERIALPLASTIC CASE
FREQUENCY IN HERTZ400.0 ALL LOCATIONS
CIRCUIT PROTECTION TYPEOVERCURRENT ALL LOCATIONS
EXTERNAL ACTUATOR LINKAGE ARRANGEMENTONE AND TWO LINKED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
83301Interchangeable
interchangeable cross-reference
interchangeable
10509Interchangeable
interchangeable cross-reference
interchangeable
6916Interchangeable
interchangeable cross-reference
interchangeable
4260793Interchangeable
interchangeable cross-reference
interchangeable
AM33HK71-179-2MG6Interchangeable
Same NIIN cross-reference
interchangeable
BKR38Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 12MC1-203-21?
12MC1-203-21 is a CIRCUIT BREAKER. It is classified as a MRO (MRO_GENERAL).
What parts can replace 12MC1-203-21?
There are 8 known substitutes for 12MC1-203-21: 83301, 10509, 6916 and 5 more. Substitute compatibility should be verified for your specific system.
Is 12MC1-203-21 still available?
12MC1-203-21 is currently cancelled.
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