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Technical Data Sheet
S21891 ✓ 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

The TRANSFORMER,POWER is a the manufacturer industrial component. Key specifications include body_width: 5.500 INCHES NOMINAL IN, ring_style: INTERNAL, body_height: 6.000 INCHES NOMINAL IN, body_length: 6.500 INCHES NOMINAL IN, usage_design: INTERNAL, inclosure_type: HERMETICALLY SEALED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5950-00-189-4947, 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
S21891
NSN: 5950-00-189-4947
FSC: 5950
CAGE: 72149 — ELECTRONIC TRANSFORMER CORP DIV ELECTRONIC TRANSFORMER CORPORATION (USA)
SPECIFICATIONS
body_width5.500 INCHES NOMINAL IN
ring_styleINTERNAL
body_height6.000 INCHES NOMINAL IN
body_length6.500 INCHES NOMINAL IN
usage_designINTERNAL
inclosure_typeHERMETICALLY SEALED
major_thickness0.040 INCHES MINIMUM AND 0.044 INCHES MAXIMUM IN
mounting_methodTHREADED STUD(S) SINGLE GROUP
frequency_rating60.0 HERTZ NOMINAL SINGLE COMPONENT
outside_diameter0.961 INCHES MINIMUM AND 0.986 INCHES MAXIMUM IN
special_featuresCASE METAL MATERIAL; 0.812 IN. O/A HEIGHT OF TERMINALS IN
surface_treatmentCADMIUM AND CHROMATE
NSN5950-00-189-4947
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available TRANSFORMER,POWER TITLE COMPONENT PN S21891 MFR TRANSFORMER,POWER
KEY FEATURES
MOUNTING METHOD: THREADED STUD(S) SINGLE GROUP
BODY LENGTH: 6.500 INCHES NOMINAL IN
RELIABILITY INDICATOR: NOT ESTABLISHED
BODY HEIGHT: 6.000 INCHES NOMINAL IN
WINDING OPERATING VOLTAGE: 225.00 AC VOLTS NOMINAL SINGLE COMPONENT FIRST SECONDARY
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC) SINGLE GROUP
WINDING OPERATING CURRENT: 375.0 MILLIAMPERES DC MAXIMUM SINGLE COMPONENT SECOND SECONDARY
TECHNICAL CHARACTERISTICS (FLIS)
MOUNTING METHODTHREADED STUD(S) SINGLE GROUP
BODY LENGTH6.500 INCHES NOMINAL IN
RELIABILITY INDICATORNOT ESTABLISHED
BODY HEIGHT6.000 INCHES NOMINAL IN
WINDING OPERATING VOLTAGE225.00 AC VOLTS NOMINAL SINGLE COMPONENT FIRST SECONDARY
WINDING OPERATING VOLTAGE115.00 AC VOLTS NOMINAL SINGLE COMPONENT SINGLE PRIMARY
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC) SINGLE GROUP
WINDING OPERATING CURRENT375.0 MILLIAMPERES DC MAXIMUM SINGLE COMPONENT SECOND SECONDARY
WINDING OPERATING CURRENT50.0 MILLIAMPERES DC MAXIMUM SINGLE COMPONENT FIRST SECONDARY
INPUT-OUTPUT PHASE RELATIONSHIPSINGLE PHASE TO SINGLE PHASE SINGLE COMPONENT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
S2189-1Interchangeable
interchangeable cross-reference
interchangeable
3000X87Interchangeable
interchangeable cross-reference
interchangeable
5480-0876Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is S21891?
S21891 is a TRANSFORMER,POWER.
What parts can replace S21891?
There are 3 known substitutes for S21891: S2189-1, 3000X87, 5480-0876. Substitute compatibility should be verified for your specific system.
What is the NSN for S21891?
S21891 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5950-00-189-4947. This indicates validated use in U.S. government and defense supply chains.
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