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278820 — RELAY,THERMAL

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

278820: RELAY,THERMAL.

The RELAY,THERMAL is a the manufacturer industrial component. Key specifications include overall_length: 1.750 INCHES NOMINAL IN, overall_diameter: 1.598 INCHES NOMINAL IN, contact_arrangement: SINGLE POLE, DOUBLE THROW, delay_time_in_seconds: 30.0 FIXED OPERATE NOMINAL, environmental_protection: HERMETIC, terminal_type_and_quantity: 8 PIN. This part is cataloged in the U.S.

Government catalog under NSN 5945-00-900-2735, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
278820
NSN: 5945-00-900-2735
FSC: 5945 — Relays and Solenoids
CAGE: 36378 — RAYTHEON TECHNICAL SERVICES COMPANY (USA)
SPECIFICATIONS
overall_length1.750 INCHES NOMINAL IN
overall_diameter1.598 INCHES NOMINAL IN
contact_arrangementSINGLE POLE, DOUBLE THROW
delay_time_in_seconds30.0 FIXED OPERATE NOMINAL
environmental_protectionHERMETIC
terminal_type_and_quantity8 PIN
heater_power_rating_in_watts5.0
mounting_facility_type_and_quantity1 OCTAL BASE PLUG-IN
contact_maximum_current_rating_in_amps6.0 AC
NSN5945-00-900-2735
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available RELAY,THERMAL TITLE COMPONENT PN 278820 MFR RELAY,THERMAL
KEY FEATURES
•
MOUNTING FACILITY TYPE AND QUANTITY: 1 OCTAL BASE PLUG-IN
•
CONTACT MAXIMUM VOLTAGE RATING IN VOLTS: 230.0 AC
•
DELAY TIME IN SECONDS: 30.0 FIXED OPERATE NOMINAL
•
CONTACT ARRANGEMENT: SINGLE POLE, DOUBLE THROW
•
OVERALL DIAMETER: 1.598 INCHES NOMINAL IN
•
HEATER POWER RATING IN WATTS: 5.0
•
HEATER VOLTAGE RATING IN VOLTS: 26.5
TECHNICAL CHARACTERISTICS
MOUNTING FACILITY TYPE AND QUANTITY1 OCTAL BASE PLUG-IN
CONTACT MAXIMUM VOLTAGE RATING IN VOLTS230.0 AC
DELAY TIME IN SECONDS30.0 FIXED OPERATE NOMINAL
CONTACT ARRANGEMENTSINGLE POLE, DOUBLE THROW
OVERALL DIAMETER1.598 INCHES NOMINAL IN
HEATER POWER RATING IN WATTS5.0
HEATER VOLTAGE RATING IN VOLTS26.5
OVERALL LENGTH1.750 INCHES NOMINAL IN
CONTACT MAXIMUM CURRENT RATING IN AMPS6.0 AC
ENVIRONMENTAL PROTECTIONHERMETIC
OTHER ITEMS IN FSC 5945 — Relays and Solenoids
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5945-00-000-0093 5945-00-001-1891 5945-00-001-2622 5945-00-001-2795 5945-00-001-2806 5945-00-001-2938 5945-00-001-3015 5945-00-001-3016
SUBSTITUTES & CROSS-REFERENCES 1
26-5-30SBReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 278820?
278820 is a RELAY,THERMAL.
What parts can replace 278820?
There is 1 known substitute for 278820: 26-5-30SB. Substitute compatibility should be verified for your specific system.
What is the NSN for 278820?
278820 is cataloged in the U.S. Government catalog under NSN 5945-00-900-2735. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.