The Relay,electromagnetic, cataloged under National Stock Number 5945-00-503-9812, is classified within Federal Supply Class 5945 (Relays and Solenoids) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Lucent Technologies Inc Corporate Headquarters. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5945-00-503-9812 |
| Primary Part Number | R2039 |
| Item Name | Relay,electromagnetic |
| FSC / FSG | 5945 / 59 — Relays and Solenoids |
| Manufacturer | Lucent Technologies Inc Corporate Headquarters |
| Status | ACTIVE |
| Pile-Up Main Contact Form Arrangement | 1B1A AND 1A A |
| Main Contact Maximum Voltage Rating in Volts | 50.0 DC |
| Mounting Facility Pattern | DIAGONAL SINGLE MOUNTING FACILITY |
| Center to Center Distance Between Mounting Facilities Parallel to Length | 0.375 INCHES NOMINAL SINGLE MOUNTING FACILITY IN |
| Main Contact Load Current Rating at Maximum Rated Voltage | 500.0 MILLIAMPERES DC RESISTIVE LOAD |
| Duty Type | CONTINUOUS |
| Winding DC Resistance Rating | 100.0 OHMS NOMINAL SECOND WINDING |
| Winding DC Resistance Rating | 700.0 OHMS NOMINAL FIRST WINDING |
| Nominal Operating Current Rating and Type | 10.0 MILLIAMPERES DC ALL WINDINGS |
| Nominal Thread Size | 0.138 INCHES SINGLE MOUNTING FACILITY IN |
| Coil Quantity | 2 |
| Environmental Protection | DUSTPROOF |
| Winding Quantity | 2 |
| Operating Voltage Rating and Type at Specified Temp | 1.5 VOLTS DC 25 DEG CELSIUS SECOND WINDING |
| Operating Voltage Rating and Type at Specified Temp | 10.2 VOLTS DC 25 DEG CELSIUS FIRST WINDING |
| Center to Center Distance Between Mounting Facilities Parallel to Width | 0.375 INCHES NOMINAL SINGLE MOUNTING FACILITY IN |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) SINGLE MOUNTING FACILITY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| R2039 | Lucent Technologies Inc Corporate Headquarters (USA) |
| Reference | Meaning |
|---|---|
| R2039RELAY | 3/9 Design control — primary reference American Telephone and Telegraph Co |
| R2039RELAY | C/1 Advisory reference — outside the item-of-supply concept Lucent Technologies Inc Corporate Headquarters |
| R2039 | 5/9 Secondary reference American Telephone and Telegraph Co |
| R2039 | 5/9 Secondary reference Lucent Technologies Inc Dba Federal Marketing Group |
| R2039RELAY | 5/9 Secondary reference Lucent Technologies Inc Dba Federal Marketing Group |
| R2039 | 5/9 Secondary reference At and T Corp |
NSN 5945-00-503-9812 is a Relay,electromagnetic, manufactured by Lucent Technologies Inc Corporate Headquarters, classified under FSC 5945, Relays and Solenoids. Status: active.
NSN 5945-00-503-9812 has 1 manufacturer part number on file: R2039 (Lucent Technologies Inc Corporate Headquarters).
1 possible match (shared part number, not a government interchangeability claim): 5905-01-007-9504. Verify interchangeability with system specifications before substitution.
Key specifications for R2039: Overall Height: 0.969 INCHES NOMINAL IN; Pile-Up Main Contact Form Arrangement: 1B1A AND 1A A; Main Contact Maximum Voltage Rating in Volts: 50.0 DC; Mounting Facility Pattern: DIAGONAL SINGLE MOUNTING FACILITY. 17 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). 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.