PartsTable
Technical Data Sheet
PartsTable / MRO / SM-B-426221
SM-B-426221 ✓ 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

The BLOCK,TELEPHONE PROTECTOR is a the manufacturer industrial component. Key specifications include shape: RECTANGULAR, material: PORCELAIN, usage_design: USED IN TELEPHONE CIRCUITS FOR PROTECTION AGAINST LIGHTNING OR HIGH VOLTAGE SURGES, overall_width: 0.370 INCHES NOMINAL IN, overall_length: 1.250 INCHES NOMINAL IN, overall_thickness: 0.290 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5920-00-160-4891, 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→ SM-B-426221
NSN: 5920-00-160-4891
FSC: 5920
CAGE: 80063 — US ARMY COMMUNICATIONS & ELECTRONICS MATERIEL READINESS COMMAND LOGISTICS ENGINEERING DIR (USA)
SPECIFICATIONS
shapeRECTANGULAR
materialPORCELAIN
usage_designUSED IN TELEPHONE CIRCUITS FOR PROTECTION AGAINST LIGHTNING OR HIGH VOLTAGE SURGES
overall_width0.370 INCHES NOMINAL IN
overall_length1.250 INCHES NOMINAL IN
overall_thickness0.290 INCHES NOMINAL IN
circuit_protector_block_locationGROUND SIDE
NSN5920-00-160-4891
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available BLOCK,TELEPHONE PROTECTOR TITLE COMPONENT PN SM-B-426221 MFR BLOCK,TELEPHONE PROTEC
KEY FEATURES
•
MATERIAL: PORCELAIN
•
OVERALL THICKNESS: 0.290 INCHES NOMINAL IN
•
SHAPE: RECTANGULAR
•
USAGE DESIGN: USED IN TELEPHONE CIRCUITS FOR PROTECTION AGAINST LIGHTNING OR HIGH VOLTAGE SURGES
•
CIRCUIT PROTECTOR BLOCK LOCATION: GROUND SIDE
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALPORCELAIN
OVERALL THICKNESS0.290 INCHES NOMINAL IN
OVERALL LENGTH1.250 INCHES NOMINAL IN
SHAPERECTANGULAR
USAGE DESIGNUSED IN TELEPHONE CIRCUITS FOR PROTECTION AGAINST LIGHTNING OR HIGH VOLTAGE SURGES
OVERALL WIDTH0.370 INCHES NOMINAL IN
CIRCUIT PROTECTOR BLOCK LOCATIONGROUND SIDE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
209905Interchangeable
interchangeable cross-reference
interchangeable
3982Interchangeable
interchangeable cross-reference
interchangeable
28013Interchangeable
interchangeable cross-reference
interchangeable
671-13Interchangeable
interchangeable cross-reference
interchangeable
671 GP 13Interchangeable
interchangeable cross-reference
interchangeable
58014Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SM-B-426221?
SM-B-426221 is a BLOCK,TELEPHONE PROTECTOR. It is classified as a MRO (MRO_GENERAL).
What parts can replace SM-B-426221?
There are 12 known substitutes for SM-B-426221: 209905, 3982, 28013 and 9 more. Substitute compatibility should be verified for your specific system.
Is SM-B-426221 still available?
SM-B-426221 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026