The Relay,thermal, cataloged under National Stock Number 5945-00-073-0045, is classified within Federal Supply Class 5945 (Relays and Solenoids) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Relay Specialties Inc. Government technical data includes 7 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5945-00-073-0045 |
| Primary Part Number | FR-20S-NC-115 |
| Item Name | Relay,thermal |
| FSC / FSG | 5945 / 59 — Relays and Solenoids |
| Manufacturer | Relay Specialties Inc |
| Status | ACTIVE |
| Mounting Facility Type and Quantity | 2 UNTHREADED HOLE(S) |
| Contact Maximum Voltage Rating in Volts | 115.0 AC AND 28.0 DC |
| Delay Time in Seconds | 20.0 FIXED OPERATE NOMINAL |
| Heater Power Rating in Watts | 4.0 |
| Heater Voltage Rating in Volts | 115.0 |
| Contact Maximum Current Rating in Amps | 6.0 AC OR 3.0 DC |
| Environmental Protection | HERMETIC |
| 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 |
|---|---|
| FR-20S-NC-115 | Relay Specialties Inc (USA) |
| Reference | Meaning |
|---|---|
| 55039-3 | 5/9 Secondary reference Drs Environmental Systems Inc |
| 13214E0752-2 | 3/2 Design control — primary reference U.S. Government activity |
| 55039-3 | 5/9 Secondary reference U.S. Government activity |
| 55039-3 | 5/2 Secondary reference U.S. Government activity |
NSN 5945-00-073-0045 is a Relay,thermal, manufactured by Relay Specialties Inc, classified under FSC 5945, Relays and Solenoids. Status: active.
NSN 5945-00-073-0045 has 1 manufacturer part number on file: FR-20S-NC-115 (Relay Specialties Inc).
1 possible match (shared part number, not a government interchangeability claim): 4320-00-322-9534. Verify interchangeability with system specifications before substitution.
Key specifications for FR-20S-NC-115: Mounting Facility Type and Quantity: 2 UNTHREADED HOLE(S); Overall Height: 1.313 INCHES NOMINAL IN; Contact Maximum Voltage Rating in Volts: 115.0 AC AND 28.0 DC; Delay Time in Seconds: 20.0 FIXED OPERATE NOMINAL. 7 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.