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U3 — COVER,ELECTRICAL RELAY

✓ Government record, cited
Middle Atlantic Products · COMPONENT
PRODUCT OVERVIEW

U3: COVER,ELECTRICAL RELAY.

Steel construction, black powder coat finish. Key specifications include material: FIBER AND CORK AND GLYCERIN AND GLUE OVERALL, overall_width: 1.6562 INCHES NOMINAL IN, overall_height: 1.4062 INCHES NOMINAL IN, overall_length: 4.2656 INCHES NOMINAL IN, outside_diameter: 4.375 INCHES NOMINAL IN, aperture_diameter: 3.437 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5945-00-549-4980, 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
U3
NSN: 5945-00-549-4980
NIINs: 005494980, 013592313, 016623178
FSC: 5945 — Relays and Solenoids
CAGE: 70408 — AT AND T CORP (USA)
SPECIFICATIONS
materialFIBER AND CORK AND GLYCERIN AND GLUE OVERALL
overall_width1.6562 INCHES NOMINAL IN
overall_height1.4062 INCHES NOMINAL IN
overall_length4.2656 INCHES NOMINAL IN
outside_diameter4.375 INCHES NOMINAL IN
aperture_diameter3.437 INCHES NOMINAL IN
output_logic_formDIODE LOGIC
bolt_circle_diameter3.875 INCHES NOMINAL IN
mounting_configurationFOUR HOLES ON 1.750 IN. BY 1.500 IN. MTG CENTERS IN
inclosure_configurationPIN GRID ARRAY
cross-sectional_thickness0.062 INCHES NOMINAL IN
largest_bolt_hole_diameter0.281 INCHES NOMINAL IN
NSN5945-00-549-4980
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR MFR: Middle Atlantic Products COVER,ELECTRICAL RELAY TITLE COMPONENT PN U3 MFR Middle Atlantic Products COVER,ELECTRICAL RELAY
KEY FEATURES
•
MOUNTING CONFIGURATION: FOUR HOLES ON 1.750 IN. BY 1.500 IN. MTG CENTERS IN
•
MATERIAL: ALUMINUM
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT1.4062 INCHES NOMINAL IN
OVERALL LENGTH4.2656 INCHES NOMINAL IN
OVERALL WIDTH1.6562 INCHES NOMINAL IN
MOUNTING CONFIGURATIONFOUR HOLES ON 1.750 IN. BY 1.500 IN. MTG CENTERS IN
MATERIALALUMINUM
SUBSTITUTES & CROSS-REFERENCES 1
U3RELAYReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is U3?
U3 is a COVER,ELECTRICAL RELAY manufactured by Middle Atlantic Products.
What parts can replace U3?
There is 1 known substitute for U3: U3RELAY. Substitute compatibility should be verified for your specific system.
What is the NSN for U3?
U3 is cataloged in the U.S. Government catalog under NSN 5945-00-549-4980. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.