PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

20857Transformer,power

Freed Transformer Co · NSN 5950-00-647-5836 · FSC 5950 · No Item Name Available
Verified by PartsTable
NSN 5950-00-647-5836 — this item is cataloged by the U.S. Government under National Stock Number 5950-00-647-5836. Primary manufacturer part number: 20857.
Features
  • Transformer,power — FSC 5950
  • Mounting Method: THREADED STUD(S) SINGLE GROUP
  • Reliability Indicator: NOT ESTABLISHED
  • Winding Function and Quantity: 1 PRIMARY AND 2 SECONDARY SINGLE COMPONENT
  • Center to Center Distance Between Mounting Facilities Parallel to Width: 2.375 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
  • Winding Operating Current: 4.0 AMPERES AC MAXIMUM SINGLE COMPONENT FIRST SECONDARY
  • Center to Center Distance Between Mounting Facilities Parallel to Length: 2.375 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
  • Input-Output Phase Relationship: SINGLE PHASE TO SINGLE PHASE SINGLE COMPONENT
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Transformer,power, cataloged under National Stock Number 5950-00-647-5836, 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 Freed Transformer Co. Government technical data includes 21 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. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5950-00-647-5836
Primary Part Number20857
Item NameTransformer,power
FSC / FSG5950 / 59 — No Item Name Available
ManufacturerFreed Transformer Co
StatusACTIVE
Mounting MethodTHREADED STUD(S) SINGLE GROUP
Reliability IndicatorNOT ESTABLISHED
Winding Function and Quantity1 PRIMARY AND 2 SECONDARY SINGLE COMPONENT
Center to Center Distance Between Mounting Facilities Parallel to Width2.375 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
Winding Operating Current4.0 AMPERES AC MAXIMUM SINGLE COMPONENT FIRST SECONDARY
Center to Center Distance Between Mounting Facilities Parallel to Length2.375 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
Input-Output Phase RelationshipSINGLE PHASE TO SINGLE PHASE SINGLE COMPONENT
Nominal Thread Size0.190 INCHES SINGLE GROUP IN
Winding Operating Voltage115.00 AC VOLTS NOMINAL SINGLE COMPONENT SINGLE PRIMARY
Body Length3.000 INCHES NOMINAL IN
Mounting Facility Quantity4 SINGLE GROUP
Body Height3.750 INCHES NOMINAL IN
Terminal Type and Quantity7 STANDOFF INSULATOR
Frequency Rating50.0 HERTZ MINIMUM AND 1.0 KILOHERTZ MAXIMUM SINGLE COMPONENT
Thread Series DesignatorUNF SINGLE GROUP
Thread Quantity Per Inch32 SINGLE GROUP
Winding Operating Current75.0 MILLIAMPERES AC MAXIMUM SINGLE COMPONENT SECOND SECONDARY
Winding Operating Voltage450.00 AC VOLTS NOMINAL SINGLE COMPONENT SECOND SECONDARY
Body Width2.875 INCHES NOMINAL IN
Winding Operating Voltage6.30 AC VOLTS NOMINAL SINGLE COMPONENT FIRST SECONDARY
Inclosure TypeHERMETICALLY SEALED
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 4
6110-00-865-4666 INTERCHANGEABLE
Regulator,voltage
6625-00-893-716510187733-001 INTERCHANGEABLE
Lead Set,test
Us Army Aviation and Missile Command
5360-01-049-905620857 INTERCHANGEABLE
Spring,helical,compression
Schneider Electric Systems Usa Inc
7690-01-472-589520857 INTERCHANGEABLE
Label
Media Recovery Inc
Cross-Reference Index
Part NumberManufacturer
307-6A Federal Div of Victoreen Instrument Co Inc (USA)
20857 PRIMARY Freed Transformer Co (USA)
Related Parts
6110-00-865-4666INTERCHANGEABLE
REGULATOR,VOLTAGE
6625-00-893-7165INTERCHANGEABLE
LEAD SET,TEST
10187733-001
5360-01-049-9056INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
20857
7690-01-472-5895INTERCHANGEABLE
LABEL
20857

Frequently Asked Questions

What is NSN 5950-00-647-5836?

NSN 5950-00-647-5836 is a Transformer,power, manufactured by Freed Transformer Co, classified under FSC 5950 (No Item Name Available). Status: active.

What are the part numbers for NSN 5950-00-647-5836?

NSN 5950-00-647-5836 has 2 cross-referenced part numbers: 307-6A (Federal Div of Victoreen Instrument Co Inc), 20857 (Freed Transformer Co).

What NSN replaces 5950-00-647-5836?

There are 4 known substitutes for 5950-00-647-5836: 6110-00-865-4666, 6625-00-893-7165, 5360-01-049-9056 and 1 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 20857?

Key specifications for 20857: Mounting Method: THREADED STUD(S) SINGLE GROUP; Reliability Indicator: NOT ESTABLISHED; Winding Function and Quantity: 1 PRIMARY AND 2 SECONDARY SINGLE COMPONENT; Center to Center Distance Between Mounting Facilities Parallel to Width: 2.375 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN. 21 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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