PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

12703Transformer,power

Foster Transformer Co Div Foster Transformer Company · NSN 5950-01-058-9289 · FSC 5950 · No Item Name Available
Verified by PartsTable
NSN 5950-01-058-9289 — this item is cataloged by the U.S. Government under National Stock Number 5950-01-058-9289. Primary manufacturer part number: 12703.
Features
  • Transformer,power — FSC 5950
  • Winding Operating Voltage: 25.20 AC VOLTS NOMINAL SINGLE COMPONENT SINGLE SECONDARY
  • Distance Between Mounting Facility Centers: 3.563 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
  • Input-Output Phase Relationship: SINGLE PHASE TO SINGLE PHASE SINGLE COMPONENT
  • Mounting Method: FLANGE AND UNTHREADED HOLE(S) SINGLE GROUP
  • Body Width: 2.250 INCHES NOMINAL IN
  • Winding Function and Quantity: 1 PRIMARY AND 1 SECONDARY SINGLE COMPONENT
  • Terminal Type and Quantity: 5 WIRE LEAD
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Transformer,power, cataloged under National Stock Number 5950-01-058-9289, 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 Foster Transformer Co Div Foster Transformer Company. Government technical data includes 16 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. 9 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5950-01-058-9289
Primary Part Number12703
Item NameTransformer,power
FSC / FSG5950 / 59 — No Item Name Available
ManufacturerFoster Transformer Co Div Foster Transformer Company
StatusACTIVE
Winding Operating Voltage25.20 AC VOLTS NOMINAL SINGLE COMPONENT SINGLE SECONDARY
Distance Between Mounting Facility Centers3.563 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
Input-Output Phase RelationshipSINGLE PHASE TO SINGLE PHASE SINGLE COMPONENT
Mounting MethodFLANGE AND UNTHREADED HOLE(S) SINGLE GROUP
Body Width2.250 INCHES NOMINAL IN
Winding Function and Quantity1 PRIMARY AND 1 SECONDARY SINGLE COMPONENT
Terminal Type and Quantity5 WIRE LEAD
Winding Operating Voltage117.00 AC VOLTS NOMINAL SINGLE COMPONENT SINGLE PRIMARY
Inclosure TypePARTIALLY INCLOSED, DOUBLE SHELL
Features ProvidedCOLOR CODED LEAD
Winding Operating Current2.0 AMPERES AC NOMINAL SINGLE COMPONENT SINGLE SECONDARY
Body Height2.625 INCHES NOMINAL IN
Mounting Hole Diameter0.188 INCHES NOMINAL SINGLE GROUP IN
Winding Power Rating50.4 VOLTS-AMPERES SINGLE COMPONENT SINGLE SECONDARY
Mounting Facility Quantity2 SINGLE GROUP
Reliability IndicatorNOT ESTABLISHED
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 9
3020-00-244-0306140RL INTERCHANGEABLE
Link,roller Chain
Jeffrey Co the
1650-00-254-49871270-3 INTERCHANGEABLE
Servocylinder
Hawker Pacific Aerospace
6620-00-321-013412703 INTERCHANGEABLE
Insert,floating Control
Honeywell International Inc. Div Aerospace - Torrance
4320-00-627-4731012703 INTERCHANGEABLE
Seal Assembly,shaft,spring Loade
Crane Pumps & Systems Pft Corp Div Crane Pumps & System Pft Corp.
2915-00-694-918412-703 INTERCHANGEABLE
Impeller
Ontic Engineering & Manufacturing, Inc Dba Ontic Us
5340-00-984-570712703 INTERCHANGEABLE
Disk,solid,plain
Eaton Aerospace Llc Dba Eaton Aerospace Jackson
6520-01-381-851112703 INTERCHANGEABLE
Bur,dental,excavating
Ss White Burs Llc
1005-01-459-536112703 INTERCHANGEABLE
Elevator
O F Mossberg & Sons Inc
5355-01-483-725922105 ITEM 13 INTERCHANGEABLE
Window,dial
B.w. Elliott Manufacturing Co., Llc
Cross-Reference Index
Part NumberManufacturer
12703 Foster Transformer Co Div Foster Transformer Company (USA)
73A655058P1 Datamagnetics Inc (USA)
Related Parts
3020-00-244-0306INTERCHANGEABLE
LINK,ROLLER CHAIN
140RL
1650-00-254-4987INTERCHANGEABLE
SERVOCYLINDER
1270-3
6620-00-321-0134INTERCHANGEABLE
INSERT,FLOATING CONTROL
12703
4320-00-627-4731INTERCHANGEABLE
SEAL ASSEMBLY,SHAFT,SPRING LOADE
012703
2915-00-694-9184INTERCHANGEABLE
IMPELLER
12-703
5340-00-984-5707INTERCHANGEABLE
DISK,SOLID,PLAIN
12703
6520-01-381-8511INTERCHANGEABLE
BUR,DENTAL,EXCAVATING
12703
1005-01-459-5361INTERCHANGEABLE
ELEVATOR
12703
5355-01-483-7259INTERCHANGEABLE
WINDOW,DIAL
22105 ITEM 13

Frequently Asked Questions

What is NSN 5950-01-058-9289?

NSN 5950-01-058-9289 is a Transformer,power, manufactured by Foster Transformer Co Div Foster Transformer Company, classified under FSC 5950 (No Item Name Available). Status: active.

What are the part numbers for NSN 5950-01-058-9289?

NSN 5950-01-058-9289 has 2 cross-referenced part numbers: 12703 (Foster Transformer Co Div Foster Transformer Company), 73A655058P1 (Datamagnetics Inc).

What NSN replaces 5950-01-058-9289?

There are 9 known substitutes for 5950-01-058-9289: 3020-00-244-0306, 1650-00-254-4987, 6620-00-321-0134 and 6 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 12703?

Key specifications for 12703: Winding Operating Voltage: 25.20 AC VOLTS NOMINAL SINGLE COMPONENT SINGLE SECONDARY; Distance Between Mounting Facility Centers: 3.563 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN; Input-Output Phase Relationship: SINGLE PHASE TO SINGLE PHASE SINGLE COMPONENT; Mounting Method: FLANGE AND UNTHREADED HOLE(S) SINGLE GROUP. 17 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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