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Technical Data Sheet
21278 ✓ Verified by PartsTable
Legrand · COMPONENT
WHAT YOU NEED TO KNOW
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PRODUCT OVERVIEW

The RELAY,ELECTROMAGNETIC is a Legrand industrial component. Key specifications include material: STEEL CASE, duty_type: CONTINUOUS, case_style: RECESSED, grip_taper: 1.125 INCHES PER FOOT IN, seal_width: 0.359 INCHES NOMINAL IN, slot_width: 0.562 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 1660-00-078-8227, 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
21278
NSN: 1660-00-078-8227
FSC: 1660
CAGE: 04577 — MISSION SYSTEMS ORCHARD PARK INC (USA)
SPECIFICATIONS
materialSTEEL CASE
duty_typeCONTINUOUS
case_styleRECESSED
grip_taper1.125 INCHES PER FOOT IN
seal_width0.359 INCHES NOMINAL IN
slot_width0.562 INCHES NOMINAL IN
grip_length3.062 INCHES NOMINAL IN
temp_rating-65.0 FAHRENHEIT AND 225.0 FAHRENHEIT DEGF
sleeve_taper1.125 INCHES PER FOOT IN
coil_quantity1
overall_width1.500 INCHES NOMINAL IN
sleeve_length3.938 INCHES NOMINAL IN
NSN1660-00-078-8227
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR MFR: Legrand RELAY,ELECTROMAGNETIC TITLE COMPONENT PN 21278 MFR Legrand RELAY,ELECTROMAGNETIC
KEY FEATURES
FSC APPLICATION DATA: OXYGEN BREATHING SYSTEM,AIRCRAFT
GENERAL CHARACTERISTICS ITEM DESCRIPTION: 12.700 IN. H,12.750 IN. W,70 PSIG OPERATING PRESSURE,10 LBS PER MIN.OUTPUT CAPACITY,W-PRESSURE OPENING&PRESSURE CLOSING VALVE,1 RELIEF VALVE,W-PRESSURE GAGE,W-OUT WARMING COIL,4 MOUNTING HOLES 0.265 IN. DIA LOCATEDON 11.750 DIA,W-CAPACITANCE GAGING ELEMENT,MAX WT 20 LBS EMPTY,PERFORMANCE PER MILITARY SPECIFICATION MILC25777 LBS
TECHNICAL CHARACTERISTICS (FLIS)
FSC APPLICATION DATAOXYGEN BREATHING SYSTEM,AIRCRAFT
GENERAL CHARACTERISTICS ITEM DESCRIPTION12.700 IN. H,12.750 IN. W,70 PSIG OPERATING PRESSURE,10 LBS PER MIN.OUTPUT CAPACITY,W-PRESSURE OPENING&PRESSURE CLOSING VALVE,1 RELIEF VALVE,W-PRESSURE GAGE,W-OUT WARMING COIL,4 MOUNTING HOLES 0.265 IN. DIA LOCATEDON 11.750 DIA,W-CAPACITANCE GAGING ELEMENT,MAX WT 20 LBS EMPTY,PERFORMANCE PER MILITARY SPECIFICATION MILC25777 LBS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
187673PC306Interchangeable
interchangeable cross-reference
interchangeable
N325PC343Interchangeable
interchangeable cross-reference
interchangeable
107253PC85Interchangeable
interchangeable cross-reference
interchangeable
E5-45-656Interchangeable
interchangeable cross-reference
interchangeable
21278Interchangeable
interchangeable cross-reference
interchangeable
91546Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21278?
21278 is a RELAY,ELECTROMAGNETIC manufactured by Legrand.
What parts can replace 21278?
There are 20 known substitutes for 21278: 187673PC306, N325PC343, 107253PC85 and 17 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21278?
21278 is cataloged in the Federal Logistics Information System (FLIS) under NSN 1660-00-078-8227. This indicates validated use in U.S. government and defense supply chains.
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