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Technical Data Sheet
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49-21 — Technical Data Sheet

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Zyxel · 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

RESISTOR,VARIABLE,WIRE WOUND,NON. Key specifications include material: STEEL OVERALL, duty_type: CONTINUOUS, end_style: SPRING END,SQUARED AND GROUND BOTH ENDS, body_style: HOLE MOUNT, body_width: 1.312 INCHES NOMINAL IN, head_style: HEXAGON. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 5930-00-105-8253, 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→ 49-21
NSN: 5930-00-105-8253
FSC: 5930
CAGE: 71183 — BRYANT ELECTRIC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
duty_typeCONTINUOUS
end_styleSPRING END,SQUARED AND GROUND BOTH ENDS
body_styleHOLE MOUNT
body_width1.312 INCHES NOMINAL IN
head_styleHEXAGON
body_height1.000 INCHES NOMINAL IN
body_length2.437 INCHES NOMINAL IN
head_height0.125 INCHES NOMINAL IN
shaft_styleROUND, SLOTTED
shaft_length0.406 INCHES MAXIMUM IN
thread_class3A A
NSN5930-00-105-8253
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR MFR: Zyxel RESISTOR,VARIABLE,WIRE WOUND,NON TITLE COMPONENT PN 49-21 MFR Zyxel RESISTOR,VARIABLE,WIRE
KEY FEATURES
•
ACTUATOR POSITION-ACTION RELATIONSHIP: UP POSITION MOMENTARY AND DOWN POSITION MOMENTARY AND CENTER POSITION MAINTAINED
•
BODY HEIGHT: 1.000 INCHES NOMINAL IN
•
BODY LENGTH: 2.437 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 0.138 INCHES IN
•
NONPILE-UP CONTACT ARRANGEMENT: 1 POLE, DOUBLE THROW, TWO POSITIONS MOMENTARY SINGLE SWITCH UNIT
•
INCLOSURE TYPE: FULLY INCLOSED
•
MOUNTING SURFACE TO TERMINAL END DISTANCE: 1.046 INCHES NOMINAL IN
•
CONTACT LOAD CURRENT RATING AT MAXIMUM RATED VOLTAGE: 20.000 AMPERES RESISTIVE AC
TECHNICAL CHARACTERISTICS
ACTUATOR POSITION-ACTION RELATIONSHIPUP POSITION MOMENTARY AND DOWN POSITION MOMENTARY AND CENTER POSITION MAINTAINED
BODY HEIGHT1.000 INCHES NOMINAL IN
BODY LENGTH2.437 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.138 INCHES IN
NONPILE-UP CONTACT ARRANGEMENT1 POLE, DOUBLE THROW, TWO POSITIONS MOMENTARY SINGLE SWITCH UNIT
INCLOSURE TYPEFULLY INCLOSED
MOUNTING SURFACE TO TERMINAL END DISTANCE1.046 INCHES NOMINAL IN
CONTACT LOAD CURRENT RATING AT MAXIMUM RATED VOLTAGE20.000 AMPERES RESISTIVE AC
ACTUATOR STYLERECTANGULAR
THREAD SERIES DESIGNATORUNF
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
1557InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
RCS1K0InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
C1000S1InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
674891InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
8673980InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
28941FInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 49-21?
49-21 is a RESISTOR,VARIABLE,WIRE WOUND,NON manufactured by Zyxel. It is classified as a MRO (MRO_GENERAL).
What parts can replace 49-21?
There are 20 known substitutes for 49-21: 1557, RCS1K0, C1000S1 and 17 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 49-21?
49-21 is cataloged in the Federal Logistics Information System under NSN 5930-00-105-8253. 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.
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Last verified: October 2026