The Relay,thermal, cataloged under National Stock Number 5945-00-078-8280, is classified within Federal Supply Class 5945 (Relays and Solenoids) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Instruments and Flight Research, Inc.. Government technical data includes 9 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 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 | 5945-00-078-8280 |
| Primary Part Number | 500554-5 |
| Item Name | Relay,thermal |
| FSC / FSG | 5945 / 59 — Relays and Solenoids |
| Manufacturer | Instruments and Flight Research, Inc. |
| Status | ACTIVE |
| Mounting Facility Type and Quantity | 1 PLUG-IN |
| Contact Maximum Voltage Rating in Volts | 115.0 AC |
| Delay Time in Seconds | 20.0 FIXED OPERATE NOMINAL |
| Contact Arrangement | SINGLE POLE, SINGLE THROW, NORMALLY OPEN |
| Heater Power Rating in Watts | 2.0 |
| Heater Voltage Rating in Volts | 2.5 |
| Contact Maximum Current Rating in Amps | 3.0 AC |
| Environmental Protection | HERMETIC |
| Terminal Type and Quantity | 4 PIN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 5945-00-078-8280 is a Relay,thermal, manufactured by Instruments and Flight Research, Inc., classified under FSC 5945, Relays and Solenoids. Status: active.
NSN 5945-00-078-8280 has 3 manufacturer part numbers on file: B-2023 (Cooper Bussmann, Llc Dba Cooper Industries), 500554-5 (Instruments and Flight Research, Inc.), 2N020 (Amperite Co Inc).
2 possible matches (shared part number, not a government interchangeability claim): 5930-01-243-4260, 5310-01-407-3501. Verify interchangeability with system specifications before substitution.
Key specifications for 500554-5: Mounting Facility Type and Quantity: 1 PLUG-IN; Contact Maximum Voltage Rating in Volts: 115.0 AC; Delay Time in Seconds: 20.0 FIXED OPERATE NOMINAL; Contact Arrangement: SINGLE POLE, SINGLE THROW, NORMALLY OPEN. 9 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.