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A278489B — Technical Data Sheet

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— · 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

The CONTACT SET,CIRCUIT BREAKER is a the manufacturer industrial component. Key specifications include material: COTTON AND PLASTIC PHENOLIC OVERALL, overall_width: 0.438 INCHES NOMINAL IN, overall_height: 0.008 INCHES NOMINAL IN, overall_length: 1.250 INCHES NOMINAL IN, style_designator: FLAT, RECTANGULAR, first_hole_spacing: 0.281 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 5970-00-350-2564, 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
A278489B
NSN: 5970-00-350-2564
FSC: 5970
CAGE: 19207 — U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM (USA)
SPECIFICATIONS
materialCOTTON AND PLASTIC PHENOLIC OVERALL
overall_width0.438 INCHES NOMINAL IN
overall_height0.008 INCHES NOMINAL IN
overall_length1.250 INCHES NOMINAL IN
style_designatorFLAT, RECTANGULAR
first_hole_spacing0.281 INCHES NOMINAL IN
third_hole_spacing0.787 INCHES NOMINAL IN
first_hole_diameter0.141 INCHES NOMINAL IN
second_hole_spacing0.219 INCHES NOMINAL IN
second_hole_diameter0.141 INCHES NOMINAL IN
material_document_and_classificationHH-P-256, TYPE 2, GRADE LE-CANCELED FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5970-00-350-2564
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CONTACT SET,CIRCUIT BREAKER TITLE COMPONENT PN A278489B MFR CONTACT SET,CIRCUIT BR
KEY FEATURES
•
MATERIAL DOCUMENT AND CLASSIFICATION: HH-P-256, TYPE 2, GRADE LE-CANCELED FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
STYLE DESIGNATOR: FLAT, RECTANGULAR
•
THIRD HOLE SPACING: 0.787 INCHES NOMINAL IN
•
FIRST HOLE DIAMETER: 0.141 INCHES NOMINAL IN
•
MATERIAL: COTTON AND PLASTIC PHENOLIC OVERALL
•
FIRST HOLE SPACING: 0.281 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
MATERIAL DOCUMENT AND CLASSIFICATIONHH-P-256, TYPE 2, GRADE LE-CANCELED FED SPEC SINGLE MATERIAL RESPONSE OVERALL
STYLE DESIGNATORFLAT, RECTANGULAR
OVERALL LENGTH1.250 INCHES NOMINAL IN
THIRD HOLE SPACING0.787 INCHES NOMINAL IN
FIRST HOLE DIAMETER0.141 INCHES NOMINAL IN
OVERALL HEIGHT0.008 INCHES NOMINAL IN
MATERIALCOTTON AND PLASTIC PHENOLIC OVERALL
FIRST HOLE SPACING0.281 INCHES NOMINAL IN
SECOND HOLE DIAMETER0.141 INCHES NOMINAL IN
OVERALL WIDTH0.438 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
549InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
05894512InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
417599-1InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
21442InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
805050InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
1A21-442InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A278489B?
A278489B is a CONTACT SET,CIRCUIT BREAKER.
What parts can replace A278489B?
There are 9 known substitutes for A278489B: 549, 05894512, 417599-1 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A278489B?
A278489B is cataloged in the Federal Logistics Information System under NSN 5970-00-350-2564. This indicates validated use in U.S. government and defense supply chains.
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Last verified: September 2026