PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

TYPE D-1Transformer,current

William Spencer · NSN 5950-01-206-6999 · FSC 5950 · No Item Name Available
Verified by PartsTable
NSN 5950-01-206-6999 — this item is cataloged by the U.S. Government under National Stock Number 5950-01-206-6999. Primary manufacturer part number: TYPE D-1.
Features
  • Transformer,current — FSC 5950
  • Input-Output Phase Relationship: SINGLE PHASE TO SINGLE PHASE SINGLE COMPONENT
  • Frequency Rating: 400.0 HERTZ NOMINAL SINGLE COMPONENT
  • Center to Center Distance Between Mounting Facilities Parallel to Width: 1.500 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
  • Mounting Hole Diameter: 0.188 INCHES NOMINAL SINGLE GROUP IN
  • Center to Center Distance Between Mounting Facilities Parallel to Length: 1.375 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
  • Body Width: 2.250 INCHES NOMINAL IN
  • Body Height: 2.500 INCHES MAXIMUM IN
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Transformer,current, cataloged under National Stock Number 5950-01-206-6999, 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 William Spencer. Government technical data includes 12 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5950-01-206-6999
Primary Part NumberTYPE D-1
Item NameTransformer,current
FSC / FSG5950 / 59 — No Item Name Available
ManufacturerWilliam Spencer
StatusACTIVE
Input-Output Phase RelationshipSINGLE PHASE TO SINGLE PHASE SINGLE COMPONENT
Frequency Rating400.0 HERTZ NOMINAL SINGLE COMPONENT
Center to Center Distance Between Mounting Facilities Parallel to Width1.500 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
Mounting Hole Diameter0.188 INCHES NOMINAL SINGLE GROUP IN
Center to Center Distance Between Mounting Facilities Parallel to Length1.375 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
Body Width2.250 INCHES NOMINAL IN
Body Height2.500 INCHES MAXIMUM IN
Inclosure TypeFULLY INCLOSED
Terminal Type and Quantity2 TAB, SOLDER LUG
Body Length2.500 INCHES MAXIMUM IN
Mounting Facility Quantity4 SINGLE GROUP
Winding Function and Quantity1 PRIMARY SINGLE COMPONENT
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 1
5945-00-259-0886 INTERCHANGEABLE
Relay,electromagnetic
Cross-Reference Index
Part NumberManufacturer
4900 William Spencer (USA)
TYPE D-1 PRIMARY William Spencer (USA)
Related Parts
5945-00-259-0886INTERCHANGEABLE
RELAY,ELECTROMAGNETIC

Frequently Asked Questions

What is NSN 5950-01-206-6999?

NSN 5950-01-206-6999 is a Transformer,current, manufactured by William Spencer, classified under FSC 5950 (No Item Name Available). Status: active.

What are the part numbers for NSN 5950-01-206-6999?

NSN 5950-01-206-6999 has 2 cross-referenced part numbers: 4900 (William Spencer), TYPE D-1 (William Spencer).

What NSN replaces 5950-01-206-6999?

There is 1 known substitute for 5950-01-206-6999: 5945-00-259-0886. Verify interchangeability with system specifications before substitution.

What are the specifications of TYPE D-1?

Key specifications for TYPE D-1: Input-Output Phase Relationship: SINGLE PHASE TO SINGLE PHASE SINGLE COMPONENT; Frequency Rating: 400.0 HERTZ NOMINAL SINGLE COMPONENT; Center to Center Distance Between Mounting Facilities Parallel to Width: 1.500 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN; Mounting Hole Diameter: 0.188 INCHES NOMINAL SINGLE GROUP IN. 12 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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