The Transformer,power, cataloged under National Stock Number 5950-01-294-9559, is classified within Federal Supply Class 5950 (Coils and Transformers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Lockheed Martin Corporation Div Rms. Government technical data includes 26 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5950-01-294-9559 |
| Primary Part Number | 77C721837P1 |
| Item Name | Transformer,power |
| FSC / FSG | 5950 / 59 — Coils and Transformers |
| Manufacturer | Lockheed Martin Corporation Div Rms |
| Status | ACTIVE |
| Transformer Winding Connection Type | DELTA-WYE AND DELTA-DELTA |
| Mounting Facility Quantity | 4 SINGLE GROUP |
| Inclosure Type | FULLY INCLOSED |
| Center to Center Distance Between Mounting Facilities Parallel to Length | 4.969 INCHES MINIMUM AND 5.031 INCHES MAXIMUM SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN |
| Input-Output Phase Relationship | THREE PHASE TO THREE PHASE SINGLE COMPONENT |
| Mounting Method | SLOT SINGLE GROUP |
| Body Width | 5.880 INCHES MAXIMUM IN |
| Body Height | 6.750 INCHES MAXIMUM IN |
| Winding Function and Quantity | 1 PRIMARY AND 4 SECONDARY SINGLE COMPONENT |
| Winding Shielding Method | INTERNAL SHIELD BROUGHT OUT TO TERMINAL AND INTERNAL SHIELD GROUNDED TO TERMINAL SINGLE COMPONENT |
| Maximum Operating Temp | 170.0 CELSIUS DEGC |
| Body Length | 8.000 INCHES MAXIMUM IN |
| Winding Operating Current | 20.4 AMPERES AC MAXIMUM SINGLE COMPONENT FIRST SECONDARY |
| Winding Operating Current | 20.4 AMPERES AC MAXIMUM SINGLE COMPONENT SECOND SECONDARY |
| Winding Operating Current | 9.8 AMPERES AC MAXIMUM SINGLE COMPONENT FOURTH SECONDARY |
| Winding Operating Current | 9.8 AMPERES AC MAXIMUM SINGLE COMPONENT THIRD SECONDARY |
| Reliability Indicator | NOT ESTABLISHED |
| Frequency Rating | 60.0 HERTZ NOMINAL SINGLE COMPONENT |
| Center to Center Distance Between Mounting Facilities Parallel to Width | 4.563 INCHES MINIMUM AND 4.687 INCHES MAXIMUM SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN |
| Winding Operating Voltage | 115.00 AC VOLTS NOMINAL SINGLE COMPONENT SINGLE PRIMARY |
| Winding Operating Voltage | 14.50 AC VOLTS NOMINAL SINGLE COMPONENT FIRST SECONDARY |
| Winding Operating Voltage | 14.50 AC VOLTS NOMINAL SINGLE COMPONENT SECOND SECONDARY |
| Winding Operating Voltage | 20.80 AC VOLTS NOMINAL SINGLE COMPONENT FOURTH SECONDARY |
| Winding Operating Voltage | 20.80 AC VOLTS NOMINAL SINGLE COMPONENT THIRD SECONDARY |
| Terminal Type and Quantity | 17 TAB, SOLDER LUG |
| Mounting Slot Width | 0.260 INCHES MINIMUM AND 0.300 INCHES MAXIMUM SINGLE GROUP IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 77C721837P001 | Lockheed Martin Corporation Div Rms (USA) |
| 77C721837P1 PRIMARY | Lockheed Martin Corporation Div Rms (USA) |
| Reference | Meaning |
|---|---|
| GE-3P169 | 5/9 Secondary reference U.S. Government activity |
NSN 5950-01-294-9559 is a Transformer,power, manufactured by Lockheed Martin Corporation Div Rms, classified under FSC 5950, Coils and Transformers. Status: active.
NSN 5950-01-294-9559 has 2 manufacturer part numbers on file: 77C721837P001 (Lockheed Martin Corporation Div Rms), 77C721837P1 (Lockheed Martin Corporation Div Rms).
Key specifications for 77C721837P1: Transformer Winding Connection Type: DELTA-WYE AND DELTA-DELTA; Mounting Facility Quantity: 4 SINGLE GROUP; Inclosure Type: FULLY INCLOSED; Center to Center Distance Between Mounting Facilities Parallel to Length: 4.969 INCHES MINIMUM AND 5.031 INCHES MAXIMUM SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN. 26 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.