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PartsTable / COMPONENT / B531
B531 ✓ 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 CAPACITOR,FIXED,ELECTROLYTIC is a the manufacturer cache protection component designed to preserve data integrity during power loss events in enterprise server and storage controller environments. Key specifications include overall_width: 3.625 INCHES NOMINAL IN, terminal_type: SCREW, overall_height: 1.750 INCHES NOMINAL IN, overall_length: 4.750 INCHES NOMINAL IN, mounting_method: BASE, contact_adjustability: ACTUATION POINT ADJUSTABLE. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5930-00-501-1739, 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
B531
NSN: 5930-00-501-1739
FSC: 5930
CAGE: 98437 — ELLIS & WATTS INTERNATIONAL, LLC (USA)
SPECIFICATIONS
overall_width3.625 INCHES NOMINAL IN
terminal_typeSCREW
overall_height1.750 INCHES NOMINAL IN
overall_length4.750 INCHES NOMINAL IN
mounting_methodBASE
contact_adjustabilityACTUATION POINT ADJUSTABLE
contact_adjustment_range+55.00 TO 85.00 ACTUATION POINT DEGREES FAHRENHEIT
temp_sensing_element_typeINTERNAL SENSOR
contact_load_current_rating0.5 AMPERES RESISTIVE LOAD FIRST VOLTAGE
contact_voltage_rating_in_volts24.0 DC AT SEA LEVEL THIRD VOLTAGE
NSN5930-00-501-1739
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CAPACITOR,FIXED,ELECTROLYTIC TITLE COMPONENT PN B531 MFR CAPACITOR,FIXED,ELECTR
KEY FEATURES
•
CONTACT LOAD CURRENT RATING: 0.5 AMPERES RESISTIVE LOAD FIRST VOLTAGE
•
CONTACT ADJUSTABILITY: ACTUATION POINT ADJUSTABLE
•
CONTACT VOLTAGE RATING IN VOLTS: 240.0 AC AT SEA LEVEL FIRST VOLTAGE
•
CONTACT ADJUSTMENT RANGE: +55.00 TO 85.00 ACTUATION POINT DEGREES FAHRENHEIT
TYPICAL APPLICATIONS
  • RAID cache protection during power loss events
  • Write-back cache enablement for storage controllers
  • Enterprise server data integrity assurance
  • Hot-swap battery/capacitor replacement in production
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESFOUR OBLONG MTG HOLES 1/8 IN. RADIUS BY 1/4 IN. LG ON 1-3/16 IN. BY 3-5/16 IN. MTG CENTERS IN
CONTACT LOAD CURRENT RATING0.5 AMPERES RESISTIVE LOAD FIRST VOLTAGE
CONTACT ADJUSTABILITYACTUATION POINT ADJUSTABLE
OVERALL LENGTH4.750 INCHES NOMINAL IN
CONTACT VOLTAGE RATING IN VOLTS240.0 AC AT SEA LEVEL FIRST VOLTAGE
CONTACT ADJUSTMENT RANGE+55.00 TO 85.00 ACTUATION POINT DEGREES FAHRENHEIT
CONTACT LOAD CURRENT RATING1.0 AMPERES RESISTIVE LOAD SECOND VOLTAGE
CONTACT VOLTAGE RATING IN VOLTS24.0 DC AT SEA LEVEL THIRD VOLTAGE
TEMP SENSING ELEMENT TYPEINTERNAL SENSOR
CONTACT VOLTAGE RATING IN VOLTS120.0 AC AT SEA LEVEL SECOND VOLTAGE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 30
210Interchangeable
interchangeable cross-reference
interchangeable
53Interchangeable
interchangeable cross-reference
interchangeable
140-1/4Interchangeable
interchangeable cross-reference
interchangeable
B53-500Interchangeable
interchangeable cross-reference
interchangeable
0C265Interchangeable
interchangeable cross-reference
interchangeable
A-A-59282Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B531?
B531 is a CAPACITOR,FIXED,ELECTROLYTIC.
What parts can replace B531?
There are 30 known substitutes for B531: 210, 53, 140-1/4 and 27 more. Substitute compatibility should be verified for your specific system.
Is B531 still available?
B531 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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Last verified: July 2026