The Relay,electromagnetic, cataloged under National Stock Number 5945-01-037-8639, is classified within Federal Supply Class 5945 (Relays and Solenoids) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Essex Electro Engineers Inc. Government technical data includes 10 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5945-01-037-8639 |
| Primary Part Number | A645-1055 |
| Item Name | Relay,electromagnetic |
| FSC / FSG | 5945 / 59 — Relays and Solenoids |
| Manufacturer | Essex Electro Engineers Inc |
| Status | ACTIVE |
| Mounting Facility Type and Quantity | 3 SLOTTED HOLE SINGLE MOUNTING FACILITY |
| Mounting Facility Pattern | IRREGULARLY SPACED SINGLE MOUNTING FACILITY |
| Duty Type | CONTINUOUS |
| Frequency in Hertz | 60.0 NOMINAL |
| Coil Quantity | 1 |
| Winding Quantity | 1 |
| Operating Voltage Rating and Type at Specified Temp | 120.0 VOLTS AC 25 DEG CELSIUS SINGLE WINDING |
| Terminal Type and Quantity | 4 PIN ALL FUNCTIONS |
| Nonpile-Up Main Contact Arrangement | 1 POLE, SINGLE THROW, NORMALLY OPEN, MOMENTARY ACTION |
| Mounting Slot Width | 0.156 INCHES NOMINAL SINGLE MOUNTING FACILITY IN |
| 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 |
|---|---|
| A645-1055 PRIMARY | Essex Electro Engineers Inc (USA) |
| Reference | Meaning |
|---|---|
| L101EL1K1 | 5/9 Secondary reference Telemecanique Inc |
NSN 5945-01-037-8639 is a Relay,electromagnetic, manufactured by Essex Electro Engineers Inc, classified under FSC 5945, Relays and Solenoids. Status: active.
NSN 5945-01-037-8639 has 1 manufacturer part number on file: A645-1055 (Essex Electro Engineers Inc).
Key specifications for A645-1055: Mounting Facility Type and Quantity: 3 SLOTTED HOLE SINGLE MOUNTING FACILITY; Overall Height: 4.656 INCHES NOMINAL IN; Mounting Facility Pattern: IRREGULARLY SPACED SINGLE MOUNTING FACILITY; Duty Type: CONTINUOUS. 10 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.