The Transformer,power Autotransforme, cataloged under National Stock Number 5950-00-683-7216, is classified within Federal Supply Class 5950 (Coils and Transformers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Grimes Aerospace Company. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5950-00-683-7216 |
| Primary Part Number | B9977-1 |
| Item Name | Transformer,power Autotransforme |
| FSC / FSG | 5950 / 59 — Coils and Transformers |
| Manufacturer | Grimes Aerospace Company |
| Status | ACTIVE |
| Mounting Facility Quantity | 3 SINGLE GROUP |
| Inclosure Type | PARTIALLY INCLOSED, DOUBLE SHELL |
| Winding Power Rating | 1.0 KILOVOLT-AMPERES SINGLE COMPONENT SINGLE PRIMARY INPUT |
| Input-Output Phase Relationship | SINGLE PHASE TO SINGLE PHASE SINGLE COMPONENT |
| Mounting Method | UNTHREADED HOLE(S) SINGLE GROUP |
| Body Width | 1.725 INCHES MAXIMUM IN |
| Body Height | 2.438 INCHES MAXIMUM IN |
| Winding Function and Quantity | 1 PRIMARY, FIXED AUTOTRANSFORMER TYPE SINGLE COMPONENT |
| Body Length | 2.650 INCHES MAXIMUM IN |
| Winding Operating Current | 10.0 AMPERES AC MAXIMUM SINGLE COMPONENT SINGLE PRIMARY INPUT |
| Winding Operating Current | 35.0 AMPERES AC MAXIMUM SINGLE COMPONENT SINGLE PRIMARY OUTPUT |
| Reliability Indicator | NOT ESTABLISHED |
| Frequency Rating | 400.0 HERTZ NOMINAL SINGLE COMPONENT |
| Winding Operating Voltage | 115.00 AC VOLTS NOMINAL SINGLE COMPONENT SINGLE PRIMARY INPUT |
| Winding Operating Voltage | 28.00 AC VOLTS NOMINAL SINGLE COMPONENT SINGLE PRIMARY OUTPUT |
| Terminal Type and Quantity | 3 WIRE LEAD |
| 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 |
|---|---|
| ST-210 | Norlake Manufacturing Co (USA) |
| B9977-1 PRIMARY | Grimes Aerospace Company (USA) |
| 59T11C1608 | Omega Associates, Inc. Dba Omega Associates Inc (USA) |
| Reference | Meaning |
|---|---|
| 99771 | 5/9 Secondary reference Grimes Aerospace Company |
| 89977-1 | C/1 Advisory reference — outside the item-of-supply concept Grimes Aerospace Company |
NSN 5950-00-683-7216 is a Transformer,power Autotransforme, manufactured by Grimes Aerospace Company, classified under FSC 5950, Coils and Transformers. Status: active.
NSN 5950-00-683-7216 has 3 manufacturer part numbers on file: ST-210 (Norlake Manufacturing Co), B9977-1 (Grimes Aerospace Company), 59T11C1608 (Omega Associates, Inc. Dba Omega Associates Inc).
3 possible matches (shared part number, not a government interchangeability claim): 5110-00-932-5227, 5950-01-225-8536, 5945-01-388-5921. Verify interchangeability with system specifications before substitution.
Key specifications for B9977-1: Mounting Facility Quantity: 3 SINGLE GROUP; Inclosure Type: PARTIALLY INCLOSED, DOUBLE SHELL; Winding Power Rating: 1.0 KILOVOLT-AMPERES SINGLE COMPONENT SINGLE PRIMARY INPUT; Input-Output Phase Relationship: SINGLE PHASE TO SINGLE PHASE SINGLE COMPONENT. 16 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.