PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

H121Transformer,power

Magnetika Inc · NSN 5950-00-578-5251 · FSC 5950 · No Item Name Available
Verified by PartsTable
NSN 5950-00-578-5251 — this item is cataloged by the U.S. Government under National Stock Number 5950-00-578-5251. Primary manufacturer part number: H121.
Features
  • Transformer,power — FSC 5950
  • Inclosure Type: HERMETICALLY SEALED
  • Body Length: 3.562 INCHES NOMINAL IN
  • Center to Center Distance Between Mounting Facilities Parallel to Width: 2.125 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
  • Reliability Indicator: NOT ESTABLISHED
  • Winding Operating Current: 10.0 AMPERES AC MAXIMUM SINGLE COMPONENT SINGLE SECONDARY
  • Terminal Type and Quantity: 7 STANDOFF, SOLDER LUG
  • Winding Operating Voltage: 105.00 AC VOLTS NOMINAL AND 115.00 AC VOLTS NOMINAL AND 210.00 AC VOLTS NOMINAL AND 220.00 AC VOLTS NOMINAL SINGLE COMPONENT SINGLE PRIMARY
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Transformer,power, cataloged under National Stock Number 5950-00-578-5251, is classified within Federal Supply Class 5950 (No Item Name Available) of the Electrical and Electronic Equipment Components group. The primary manufacturer of record is Magnetika Inc. Government technical data includes 19 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5950-00-578-5251
Primary Part NumberH121
Item NameTransformer,power
FSC / FSG5950 / 59 — No Item Name Available
ManufacturerMagnetika Inc
StatusACTIVE
Inclosure TypeHERMETICALLY SEALED
Body Length3.562 INCHES NOMINAL IN
Center to Center Distance Between Mounting Facilities Parallel to Width2.125 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
Reliability IndicatorNOT ESTABLISHED
Winding Operating Current10.0 AMPERES AC MAXIMUM SINGLE COMPONENT SINGLE SECONDARY
Terminal Type and Quantity7 STANDOFF, SOLDER LUG
Winding Operating Voltage105.00 AC VOLTS NOMINAL AND 115.00 AC VOLTS NOMINAL AND 210.00 AC VOLTS NOMINAL AND 220.00 AC VOLTS NOMINAL SINGLE COMPONENT SINGLE PRIMARY
Mounting MethodTHREADED STUD(S) SINGLE GROUP
Input-Output Phase RelationshipSINGLE PHASE TO SINGLE PHASE SINGLE COMPONENT
Winding Function and Quantity1 PRIMARY AND 1 SECONDARY SINGLE COMPONENT
Body Height3.875 INCHES NOMINAL IN
Thread Quantity Per Inch32 SINGLE GROUP
Body Width3.062 INCHES NOMINAL IN
Nominal Thread Size0.164 INCHES SINGLE GROUP IN
Center to Center Distance Between Mounting Facilities Parallel to Length2.625 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
Thread Series DesignatorUNIFIED NATIONAL COARSE (UNC) SINGLE GROUP
Mounting Facility Quantity4 SINGLE GROUP
Winding Operating Voltage2.50 AC VOLTS NOMINAL SINGLE COMPONENT SINGLE SECONDARY
Frequency Rating50.0 HERTZ NOMINAL OR 60.0 HERTZ NOMINAL SINGLE COMPONENT
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
3020-00-486-8143GC14-21P1 INTERCHANGEABLE
Gear,spur
Secs Inc
3030-00-528-3787 INTERCHANGEABLE
Belt,v
6685-00-641-31768791666 INTERCHANGEABLE
Indicator,humidity,plug
Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Us Army Research, Development and Engineering Command Armament
3455-00-984-3405 INTERCHANGEABLE
File,rotary
3510-01-326-0704H 121 INTERCHANGEABLE
Card,timer
Henrici Controls Corporation
5360-01-493-9516 INTERCHANGEABLE
Spring,flat
Cross-Reference Index
Part NumberManufacturer
H121 United Transformer Corp Sub of Opt Industries Inc (USA)
H121 PRIMARY Magnetika Inc (USA)
Related Parts
3020-00-486-8143INTERCHANGEABLE
GEAR,SPUR
GC14-21P1
3030-00-528-3787INTERCHANGEABLE
BELT,V
6685-00-641-3176INTERCHANGEABLE
INDICATOR,HUMIDITY,PLUG
8791666
3455-00-984-3405INTERCHANGEABLE
FILE,ROTARY
3510-01-326-0704INTERCHANGEABLE
CARD,TIMER
H 121
5360-01-493-9516INTERCHANGEABLE
SPRING,FLAT

Frequently Asked Questions

What is NSN 5950-00-578-5251?

NSN 5950-00-578-5251 is a Transformer,power, manufactured by Magnetika Inc, classified under FSC 5950 (No Item Name Available). Status: active.

What are the part numbers for NSN 5950-00-578-5251?

NSN 5950-00-578-5251 has 2 cross-referenced part numbers: H121 (United Transformer Corp Sub of Opt Industries Inc), H121 (Magnetika Inc).

What NSN replaces 5950-00-578-5251?

There are 6 known substitutes for 5950-00-578-5251: 3020-00-486-8143, 3030-00-528-3787, 6685-00-641-3176 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of H121?

Key specifications for H121: Inclosure Type: HERMETICALLY SEALED; Body Length: 3.562 INCHES NOMINAL IN; Center to Center Distance Between Mounting Facilities Parallel to Width: 2.125 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN; Reliability Indicator: NOT ESTABLISHED. 19 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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