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Technical Data Sheet
PartsTable / COMPONENT / A3871
A3871 ✓ 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

TRANSFORMER,POWER AUTOTRANSFORME. Key specifications include body_width: 2.312 INCHES NOMINAL IN, body_height: 2.844 INCHES NOMINAL IN, body_length: 2.250 INCHES NOMINAL IN, usage_design: REGULATE TEMPERATURE OF ENGINE HEATER, mounting_type: TRAILER, inclosure_type: OPEN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5950-00-645-7104, 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
A3871
NSN: 5950-00-645-7104
FSC: 5950
CAGE: 81160 — FOSTER TRANSFORMER CO DIV FOSTER TRANSFORMER COMPANY (USA)
SPECIFICATIONS
body_width2.312 INCHES NOMINAL IN
body_height2.844 INCHES NOMINAL IN
body_length2.250 INCHES NOMINAL IN
usage_designREGULATE TEMPERATURE OF ENGINE HEATER
mounting_typeTRAILER
inclosure_typeOPEN
overall_height1.851 INCHES MINIMUM AND 1.868 INCHES MAXIMUM IN
mounting_methodFLANGE
thermostat_typeBELLOWS
frequency_rating380.0 HERTZ MINIMUM AND 1.6 KILOHERTZ MAXIMUM SINGLE COMPONENT
flow_control_deviceBY-PASS
opening_temp_rating170.0 FAHRENHEIT MINIMUM AND 175.0 FAHRENHEIT MAXIMUM DEGF
NSN5950-00-645-7104
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available TRANSFORMER,POWER AUTOTRANSFORME TITLE COMPONENT PN A3871 MFR TRANSFORMER,POWER AUTO
KEY FEATURES
•
CENTER TO CENTER DISTANCE BETWEEN MOUNTING FACILITIES PARALLEL TO LENGTH: 1.250 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
•
BODY WIDTH: 2.312 INCHES NOMINAL IN
•
INPUT-OUTPUT PHASE RELATIONSHIP: SINGLE PHASE TO SINGLE PHASE SINGLE COMPONENT
•
WINDING POWER RATING: 490.0 VOLTS-AMPERES SINGLE COMPONENT SINGLE PRIMARY INPUT
•
WINDING OPERATING VOLTAGE: 121.00 AC VOLTS NOMINAL SINGLE COMPONENT SINGLE PRIMARY INPUT
•
BODY LENGTH: 2.250 INCHES NOMINAL IN
•
WINDING OPERATING CURRENT: 4.25 AMPERES AC MAXIMUM SINGLE COMPONENT SINGLE PRIMARY INPUT
•
CENTER TO CENTER DISTANCE BETWEEN MOUNTING FACILITIES PARALLEL TO WIDTH: 0.750 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
TECHNICAL CHARACTERISTICS (FLIS)
CENTER TO CENTER DISTANCE BETWEEN MOUNTING FACILITIES PARALLEL TO LENGTH1.250 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
BODY WIDTH2.312 INCHES NOMINAL IN
INPUT-OUTPUT PHASE RELATIONSHIPSINGLE PHASE TO SINGLE PHASE SINGLE COMPONENT
WINDING POWER RATING490.0 VOLTS-AMPERES SINGLE COMPONENT SINGLE PRIMARY INPUT
WINDING OPERATING VOLTAGE121.00 AC VOLTS NOMINAL SINGLE COMPONENT SINGLE PRIMARY INPUT
BODY LENGTH2.250 INCHES NOMINAL IN
WINDING OPERATING CURRENT4.25 AMPERES AC MAXIMUM SINGLE COMPONENT SINGLE PRIMARY INPUT
CENTER TO CENTER DISTANCE BETWEEN MOUNTING FACILITIES PARALLEL TO WIDTH0.750 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
FREQUENCY RATING380.0 HERTZ MINIMUM AND 1.6 KILOHERTZ MAXIMUM SINGLE COMPONENT
BODY HEIGHT2.844 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
20330Interchangeable
interchangeable cross-reference
interchangeable
20329PCD5-6-4Interchangeable
interchangeable cross-reference
interchangeable
D5-6-4Interchangeable
interchangeable cross-reference
interchangeable
40913PC15Interchangeable
interchangeable cross-reference
interchangeable
2033Interchangeable
interchangeable cross-reference
interchangeable
7531600Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A3871?
A3871 is a TRANSFORMER,POWER AUTOTRANSFORME.
What parts can replace A3871?
There are 21 known substitutes for A3871: 20330, 20329PCD5-6-4, D5-6-4 and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A3871?
A3871 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5950-00-645-7104. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026