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Technical Data Sheet
B1877 ✓ Verified by PartsTable
· COMPONENT
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

The RELAY,THERMAL is a the manufacturer industrial component. Key specifications include material: COTTON, overall_width: 5.250 INCHES NOMINAL IN, component_name: CABLE ASSEMBLY,SPECIAL PURPOSE,ELECTRICAL, locking_device: NOT INCLUDED, overall_height: 2.500 INCHES NOMINAL IN, overall_length: 3.250 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 5995-00-537-7912, 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
B1877
NSN: 5995-00-537-7912
FSC: 5995
CAGE: 04901 — BOONTON ELECTRONICS CORPORATION DIV BOONTON ELECTRONICS (USA)
SPECIFICATIONS
materialCOTTON
overall_width5.250 INCHES NOMINAL IN
component_nameCABLE ASSEMBLY,SPECIAL PURPOSE,ELECTRICAL
locking_deviceNOT INCLUDED
overall_height2.500 INCHES NOMINAL IN
overall_length3.250 INCHES NOMINAL IN
handle_locationSIDES
handle_quantity2
overall_diameter1.250 INCHES NOMINAL IN
surface_treatmentPAINT
component_quantity1
contact_arrangementSINGLE POLE, SINGLE THROW, NORMALLY CLOSED
NSN5995-00-537-7912
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available RELAY,THERMAL TITLE COMPONENT PN B1877 MFR RELAY,THERMAL
KEY FEATURES
HANDLE LOCATION: SIDES
SURFACE TREATMENT: PAINT
MATERIAL: COTTON
COMPONENT CONTROLLING AGENCY: JETDS
COMPONENT IDENTIFYING NUMBER: CY-1251/U TYPE NO.
FSC APPLICATION DATA: RADIO,EXCEPT RADIO NAVIGATION,NONAIRBORNE
COMPONENT NAME: CABLE ASSEMBLY,SPECIAL PURPOSE,ELECTRICAL
TECHNICAL CHARACTERISTICS (FLIS)
HANDLE LOCATIONSIDES
SURFACE TREATMENTPAINT
MATERIALCOTTON
COMPONENT CONTROLLING AGENCYJETDS
COMPONENT IDENTIFYING NUMBERCY-1251/U TYPE NO.
OVERALL WIDTH5.250 INCHES NOMINAL IN
FSC APPLICATION DATARADIO,EXCEPT RADIO NAVIGATION,NONAIRBORNE
COMPONENT NAMECABLE ASSEMBLY,SPECIAL PURPOSE,ELECTRICAL
OVERALL LENGTH9.000 INCHES NOMINAL IN
LOCKING DEVICENOT INCLUDED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
37022Interchangeable
interchangeable cross-reference
interchangeable
B1877Interchangeable
interchangeable cross-reference
interchangeable
MILR12015Interchangeable
Same NIIN cross-reference
interchangeable
CY1251UInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B1877?
B1877 is a RELAY,THERMAL.
What parts can replace B1877?
There are 4 known substitutes for B1877: 37022, B1877, MILR12015 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B1877?
B1877 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5995-00-537-7912. This indicates validated use in U.S. government and defense supply chains.
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