The Relay-Switch, cataloged under National Stock Number 5999-01-390-7724, is classified within Federal Supply Class 5999 (Miscellaneous Electrical and Electronic Components) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Leach International Corp Div Leach International Corporation. Government technical data includes 16 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5999-01-390-7724 |
| Primary Part Number | YL-D4A-003 |
| Item Name | Relay-Switch |
| FSC / FSG | 5999 / 59 — Miscellaneous Electrical and Electronic Components |
| Manufacturer | Leach International Corp Div Leach International Corporation |
| Status | ACTIVE |
| Contact Current Type | AC OR DC |
| Current Type | DC |
| Contact Form Arrangement | 4A A |
| Current Rating at Maximum Rated Voltage | 5.0 AMPERES NOMINAL |
| Voltage Rating at Maximum Rated Current | 200.0 VOLTS |
| Panel Material | STEEL PANEL |
| Operating Voltage in Volts | 28.0 NOMINAL |
| Contact Maximum Voltage Rating in Volts | 28.0 |
| Switch Type | MAGNETIC |
| Action Type | INSTANTANEOUS |
| Maximum DC Resistance in Ohms | 600.0 |
| Relay Type | CONTACTOR |
| Surface Treatment | PAINT |
| Mounting Configuration | ONE UNTHREADED NO. 6-32 HOLE ON ONE SIDE AA0.385 EDGE TO CENTER ND ON THE OTHER SIDE TWO UNTHREADED |
| Maximum Voltage Rating in Volts | 28.0 |
| Coil Current Type | DC |
| 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 |
|---|---|
| YL-D4A-003 PRIMARY | Leach International Corp Div Leach International Corporation (USA) |
| Reference | Meaning |
|---|---|
| YL-D4A-003 | 5/1 Secondary reference Aerospace and Defence Products Pty Ltd |
NSN 5999-01-390-7724 is a Relay-Switch, manufactured by Leach International Corp Div Leach International Corporation, classified under FSC 5999, Miscellaneous Electrical and Electronic Components. Status: active.
NSN 5999-01-390-7724 has 1 manufacturer part number on file: YL-D4A-003 (Leach International Corp Div Leach International Corporation).
Key specifications for YL-D4A-003: Contact Current Type: AC OR DC; Overall Height: 0.638 INCHES NOMINAL IN; Current Type: DC; Contact Form Arrangement: 4A A. 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.