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Technical Data Sheet
PartsTable / COMPONENT / 4CX300A
4CX300A ✓ Verified by PartsTable
— · COMPONENT
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

THERMAL RELEASE,CIRCUIT BREAKER. Key specifications include tube_type: TETRODE, special_features: ENVELOPE MATERIAL: CERAMIC AND METAL, nondefinitive_spec/std_data: 8167 TYPE, reference_number_differentiating_characteristics: NAVORD OD-41152. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5960-00-082-3973, 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
4CX300A
NSN: 5960-00-082-3973
FSC: 5960
CAGE: 03538 — LOCKHEED MARTIN CORPORATION DIV RMS (USA)
SPECIFICATIONS
tube_typeTETRODE
nondefinitive_spec/std_data8167 TYPE
reference_number_differentiating_characteristicsNAVORD OD-41152
NSN5960-00-082-3973
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available THERMAL RELEASE,CIRCUIT BREAKER TITLE COMPONENT PN 4CX300A MFR THERMAL RELEASE,CIRCUI
KEY FEATURES
•
TUBE TYPE: TETRODE
•
NONDEFINITIVE SPEC/STD DATA: 8167 TYPE
TECHNICAL CHARACTERISTICS (FLIS)
TUBE TYPETETRODE
SPECIAL FEATURESENVELOPE MATERIAL :CERAMIC AND METAL
NONDEFINITIVE SPEC/STD DATA8167 TYPE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
BR26229Interchangeable
interchangeable cross-reference
interchangeable
8167Interchangeable
interchangeable cross-reference
interchangeable
262293Interchangeable
interchangeable cross-reference
interchangeable
4CX300AInterchangeable
interchangeable cross-reference
interchangeable
B1-67Interchangeable
interchangeable cross-reference
interchangeable
B1.65Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4CX300A?
4CX300A is a THERMAL RELEASE,CIRCUIT BREAKER.
What parts can replace 4CX300A?
There are 14 known substitutes for 4CX300A: BR26229, 8167, 262293 and 11 more. Substitute compatibility should be verified for your specific system.
Is 4CX300A still available?
4CX300A is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026