PartsTable
Technical Data Sheet
PartsTable / MRO / 20SR2B4
20SR2B4 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
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

CAPACITOR,VARIABLE,AIR DIELECTRI. Key specifications include shaft_type: ROUND, THREADED HOLE SINGLE ACTUATOR, shaft_length: 0.719 INCHES MINIMUM AND 0.781 INCHES MAXIMUM SINGLE ACTUATOR IN, overall_width: 9.500 INCHES NOMINAL IN, terminal_type: TAB, SOLDER LUG, overall_height: 9.625 INCHES MAXIMUM IN, overall_length: 7.094 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 5930-00-548-7938, 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
MRO→ MRO_GENERAL→ 20SR2B4
NSN: 5930-00-548-7938
FSC: 5930
CAGE: 82121 — ELECTRO SWITCH CORP. DBA ELECTRO SWITCH CORP (USA)
SPECIFICATIONS
shaft_typeROUND, THREADED HOLE SINGLE ACTUATOR
shaft_length0.719 INCHES MINIMUM AND 0.781 INCHES MAXIMUM SINGLE ACTUATOR IN
overall_width9.500 INCHES NOMINAL IN
terminal_typeTAB, SOLDER LUG
overall_height9.625 INCHES MAXIMUM IN
overall_length7.094 INCHES NOMINAL IN
shaft_diameter0.625 INCHES NOMINAL SINGLE ACTUATOR IN
mounting_methodBRACKET(S) AND SLOT SINGLE MOUNTING FACILITY
special_featuresROUND,THREADED HOLE TYPE SHAFT
style_designatorTAP, CIRCUIT SELECTOR
features_providedDUMMY SECTION
mounting_slot_width0.531 INCHES NOMINAL SINGLE MOUNTING FACILITY IN
NSN5930-00-548-7938
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CAPACITOR,VARIABLE,AIR DIELECTRI TITLE COMPONENT PN 20SR2B4 MFR CAPACITOR,VARIABLE,AIR
KEY FEATURES
•
HAZARDOUS LOCATIONS/ENVIRONMENTAL PROTECTION: DUSTPROOF
•
CONTACT VOLTAGE RATING IN VOLTS: 500.0 AC AT SEA LEVEL
•
SHAFT LENGTH: 0.719 INCHES MINIMUM AND 0.781 INCHES MAXIMUM SINGLE ACTUATOR IN
•
UNTHREADED MOUNTING HOLE DIAMETER: 0.500 INCHES NOMINAL SINGLE MOUNTING FACILITY IN
•
INDIVIDUAL SECTION QUANTITY: 4
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)
OVERALL HEIGHT9.625 INCHES MAXIMUM IN
OVERALL LENGTH7.094 INCHES NOMINAL IN
OVERALL WIDTH9.500 INCHES NOMINAL IN
HAZARDOUS LOCATIONS/ENVIRONMENTAL PROTECTIONDUSTPROOF
CONTACT VOLTAGE RATING IN VOLTS500.0 AC AT SEA LEVEL
SHAFT LENGTH0.719 INCHES MINIMUM AND 0.781 INCHES MAXIMUM SINGLE ACTUATOR IN
UNTHREADED MOUNTING HOLE DIAMETER0.500 INCHES NOMINAL SINGLE MOUNTING FACILITY IN
INDIVIDUAL SECTION QUANTITY4
SHAFT TYPEROUND, THREADED HOLE SINGLE ACTUATOR
FEATURES PROVIDEDDUMMY SECTION
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
9301Interchangeable
interchangeable cross-reference
interchangeable
N1015PC13Interchangeable
interchangeable cross-reference
interchangeable
9302Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-15291/11Interchangeable
interchangeable cross-reference
interchangeable
20SR4S3Interchangeable
interchangeable cross-reference
interchangeable
MILS15291Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 20SR2B4?
20SR2B4 is a CAPACITOR,VARIABLE,AIR DIELECTRI. It is classified as a MRO (MRO_GENERAL).
What parts can replace 20SR2B4?
There are 19 known substitutes for 20SR2B4: 9301, N1015PC13, 9302 and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 20SR2B4?
20SR2B4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5930-00-548-7938. 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