PartsTable
Technical Data Sheet
3957 ✓ 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 material: COPPER CORE CONDUCTOR ALL CONDUCTORS, body_style: PISTON, body_length: 1.125 INCHES NOMINAL IN, thread_class: 2A A, bushing_shape: ROUND, pole_quantity: 1 SINGLE SECTION REAR. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5930-00-075-2308, 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 3957
NSN: 5930-00-075-2308
FSC: 5930
CAGE: 76854 — ELECTRO SWITCH CORP. DBA OAK GRISGSBY DIV ELECTROSWITCH (USA)
SPECIFICATIONS
materialCOPPER CORE CONDUCTOR ALL CONDUCTORS
body_stylePISTON
body_length1.125 INCHES NOMINAL IN
thread_class2A A
bushing_shapeROUND
pole_quantity1 SINGLE SECTION REAR
rating_methodELECTRICAL SINGLE COMPONENT SINGLE WINDING
body_thickness0.062 INCHES NOMINAL IN
bushing_length0.203 INCHES NOMINAL IN
coil_form_typeHOLLOW SINGLE COMPONENT
conductor_formSTRANDED ALL CONDUCTORS
inclosure_typeFULLY INCLOSED
NSN5930-00-075-2308
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CAPACITOR,VARIABLE,AIR DIELECTRI TITLE COMPONENT PN 3957 MFR CAPACITOR,VARIABLE,AIR
KEY FEATURES
BODY THICKNESS: 0.062 INCHES NOMINAL IN
SWITCH CONTACT BASIC DESIGN: NONPILE-UP SYMMETRICAL
THROW QUANTITY: 3 SINGLE SECTION REAR
CONTACT SWITCHING ACTION: MAKES BEFORE BREAKS SINGLE SECTION REAR
CONTACT VOLTAGE RATING IN VOLTS: 28.0 DC AT SEA LEVEL
CONTACT LOAD CURRENT RATING: 1.0 AMPERES RESISTIVE LOAD AC AT SEA LEVEL
POLE QUANTITY: 1 SINGLE SECTION FRONT
STYLE DESIGNATOR: SWITCH SECTION, ROTARY
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)
BODY THICKNESS0.062 INCHES NOMINAL IN
SWITCH CONTACT BASIC DESIGNNONPILE-UP SYMMETRICAL
THROW QUANTITY3 SINGLE SECTION REAR
CONTACT SWITCHING ACTIONMAKES BEFORE BREAKS SINGLE SECTION REAR
CONTACT VOLTAGE RATING IN VOLTS28.0 DC AT SEA LEVEL
CONTACT LOAD CURRENT RATING1.0 AMPERES RESISTIVE LOAD AC AT SEA LEVEL
POLE QUANTITY1 SINGLE SECTION FRONT
STYLE DESIGNATORSWITCH SECTION, ROTARY
POLE QUANTITY1 SINGLE SECTION REAR
CONTACT VOLTAGE RATING IN VOLTS110.0 AC AT SEA LEVEL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
9162Interchangeable
interchangeable cross-reference
interchangeable
D2906-4Interchangeable
interchangeable cross-reference
interchangeable
3B7738Interchangeable
interchangeable cross-reference
interchangeable
3957Interchangeable
interchangeable cross-reference
interchangeable
35-7260Interchangeable
interchangeable cross-reference
interchangeable
090039579Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3957?
3957 is a CAPACITOR,VARIABLE,AIR DIELECTRI. It is classified as a MRO (MRO_GENERAL).
What parts can replace 3957?
There are 12 known substitutes for 3957: 9162, D2906-4, 3B7738 and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 3957?
3957 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5930-00-075-2308. This indicates validated use in U.S. government and defense supply chains.
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