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9T51B128 — TRANSFORMER,POWER

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

9T51B128: TRANSFORMER,POWER.

The TRANSFORMER,POWER is a the manufacturer industrial component. Key specifications include body_width: 4.313 INCHES NOMINAL IN, body_height: 8.125 INCHES NOMINAL IN, body_length: 4.750 INCHES NOMINAL IN, inclosure_type: PARTIALLY INCLOSED, DOUBLE SHELL, mounting_method: UNTHREADED HOLE(S) SINGLE GROUP, frequency_rating: 50.0 HERTZ NOMINAL OR 60.0 HERTZ NOMINAL SINGLE COMPONENT. This part is cataloged in the U.S.

Government catalog under NSN 5950-00-957-6557, 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
9T51B128
NSN: 5950-00-957-6557
FSC: 5950 — Coils and Transformers
CAGE: 03538 — LOCKHEED MARTIN CORPORATION DIV RMS (USA)
SPECIFICATIONS
body_width4.313 INCHES NOMINAL IN
body_height8.125 INCHES NOMINAL IN
body_length4.750 INCHES NOMINAL IN
inclosure_typePARTIALLY INCLOSED, DOUBLE SHELL
mounting_methodUNTHREADED HOLE(S) SINGLE GROUP
frequency_rating50.0 HERTZ NOMINAL OR 60.0 HERTZ NOMINAL SINGLE COMPONENT
reliability_indicatorNOT ESTABLISHED
winding_operating_voltage240.00 AC VOLTS NOMINAL SINGLE COMPONENT SINGLE PRIMARY
mounting_facility_quantity3 SINGLE GROUP
terminal_type_and_quantity6 TAB, SOLDER LUG
winding_function_and_quantity2 PRIMARY SINGLE COMPONENT
input-output_phase_relationshipSINGLE PHASE TO SINGLE PHASE SINGLE COMPONENT
NSN5950-00-957-6557
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available TRANSFORMER,POWER TITLE COMPONENT PN 9T51B128 MFR TRANSFORMER,POWER
KEY FEATURES
•
MOUNTING FACILITY QUANTITY: 3 SINGLE GROUP
•
INCLOSURE TYPE: PARTIALLY INCLOSED, DOUBLE SHELL
•
INPUT-OUTPUT PHASE RELATIONSHIP: SINGLE PHASE TO SINGLE PHASE SINGLE COMPONENT
•
MOUNTING METHOD: UNTHREADED HOLE(S) SINGLE GROUP
•
BODY WIDTH: 4.313 INCHES NOMINAL IN
•
BODY HEIGHT: 8.125 INCHES NOMINAL IN
•
CENTER TO CENTER DISTANCE BETWEEN MOUNTING FACILITIES PARALLEL TO THE BASE OF AN ISOSCELES TRIANGLE: 3.906 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
•
CENTER TO CENTER DISTANCE BETWEEN MOUNTING FACILITIES PARALLEL TO THE ALTITUDE OF AN ISOSCELES TRIANGLE: 8.188 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
TECHNICAL CHARACTERISTICS
MOUNTING FACILITY QUANTITY3 SINGLE GROUP
INCLOSURE TYPEPARTIALLY INCLOSED, DOUBLE SHELL
INPUT-OUTPUT PHASE RELATIONSHIPSINGLE PHASE TO SINGLE PHASE SINGLE COMPONENT
MOUNTING METHODUNTHREADED HOLE(S) SINGLE GROUP
BODY WIDTH4.313 INCHES NOMINAL IN
BODY HEIGHT8.125 INCHES NOMINAL IN
CENTER TO CENTER DISTANCE BETWEEN MOUNTING FACILITIES PARALLEL TO THE BASE OF AN ISOSCELES TRIANGLE3.906 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
CENTER TO CENTER DISTANCE BETWEEN MOUNTING FACILITIES PARALLEL TO THE ALTITUDE OF AN ISOSCELES TRIANGLE8.188 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
WINDING FUNCTION AND QUANTITY2 PRIMARY SINGLE COMPONENT
BODY LENGTH4.750 INCHES NOMINAL IN
OTHER ITEMS IN FSC 5950 — Coils and Transformers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5950-00-000-0146 5950-00-001-1372 5950-00-001-1386 5950-00-001-1410 5950-00-001-1411 5950-00-001-1412 5950-00-001-1413 5950-00-001-1414
SUBSTITUTES & CROSS-REFERENCES 1
9T51Y128Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 9T51B128?
9T51B128 is a TRANSFORMER,POWER.
What parts can replace 9T51B128?
There is 1 known substitute for 9T51B128: 9T51Y128. Substitute compatibility should be verified for your specific system.
What is the NSN for 9T51B128?
9T51B128 is cataloged in the U.S. Government catalog under NSN 5950-00-957-6557. 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.