PartsTable
Technical Data Sheet
PartsTable / MRO / 21ER3
21ER3 ✓ 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 SWITCH,SENSITIVE is a the manufacturer industrial component. Key specifications include body_style: HOLE MOUNTED, housing_width: 2.250 INCHES NOMINAL IN, actuator_style: ROUND, housing_height: 1.125 INCHES NOMINAL IN, housing_length: 3.937 INCHES NOMINAL IN, inclosure_type: FULLY INCLOSED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5930-00-034-0572, 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→ 21ER3
NSN: 5930-00-034-0572
FSC: 5930
CAGE: 91929 — HONEYWELL INTERNATIONAL INC. DBA HONEYWEEL SENSING & CONTROLS (USA)
SPECIFICATIONS
body_styleHOLE MOUNTED
housing_width2.250 INCHES NOMINAL IN
actuator_styleROUND
housing_height1.125 INCHES NOMINAL IN
housing_length3.937 INCHES NOMINAL IN
inclosure_typeFULLY INCLOSED
actuator_height0.759 INCHES NOMINAL IN
mounting_methodTERMINAL
special_featuresWEAPON SYSTEM ESSENTIAL
actuator_diameter0.244 INCHES NOMINAL IN
actuator_movement59.0 PRETRAVEL DEGREES NOMINAL AND 138.0 OVERTRAVEL DEGREES MAXIMUM AND 5.0 DIFFERENTIAL DEGREES MAXIMUM
switch_release_force23.0 OUNCES MAXIMUM OZ
NSN5930-00-034-0572
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available SWITCH,SENSITIVE TITLE COMPONENT PN 21ER3 MFR SWITCH,SENSITIVE
KEY FEATURES
•
HOUSING HEIGHT: 1.125 INCHES NOMINAL IN
•
ACTUATOR STYLE: ROUND
•
ACTUATOR MOVEMENT: 59.0 PRETRAVEL DEGREES NOMINAL AND 138.0 OVERTRAVEL DEGREES MAXIMUM AND 5.0 DIFFERENTIAL DEGREES MAXIMUM
•
TERMINAL TYPE AND QUANTITY: 1 CONNECTOR, RECEPTACLE
•
CONTACT LOAD CURRENT RATING AT MAXIMUM RATED VOLTAGE: 15.000 AMPERES RESISTIVE DC AND 10.000 AMPERES INDUCTIVE DC AND 1.000 AMPERES RESISTIVE AC AND 1.000 AMPERES INDUCTIVE AC
•
ACTUATOR DIAMETER: 0.244 INCHES NOMINAL IN
•
CENTER TO CENTER DISTANCE BETWEEN HOUSING MOUNTING FACILITIES PARALLEL TO LENGTH: 2.437 INCHES NOMINAL IN
•
HOUSING LENGTH: 3.937 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
HOUSING HEIGHT1.125 INCHES NOMINAL IN
ACTUATOR STYLEROUND
ACTUATOR MOVEMENT59.0 PRETRAVEL DEGREES NOMINAL AND 138.0 OVERTRAVEL DEGREES MAXIMUM AND 5.0 DIFFERENTIAL DEGREES MAXIMUM
TERMINAL TYPE AND QUANTITY1 CONNECTOR, RECEPTACLE
CONTACT LOAD CURRENT RATING AT MAXIMUM RATED VOLTAGE15.000 AMPERES RESISTIVE DC AND 10.000 AMPERES INDUCTIVE DC AND 1.000 AMPERES RESISTIVE AC AND 1.000 AMPERES INDUCTIVE AC
ACTUATOR DIAMETER0.244 INCHES NOMINAL IN
CENTER TO CENTER DISTANCE BETWEEN HOUSING MOUNTING FACILITIES PARALLEL TO LENGTH2.437 INCHES NOMINAL IN
HOUSING LENGTH3.937 INCHES NOMINAL IN
ACTUATOR FREE POSITION HEIGHT0.759 INCHES NOMINAL IN
MAXIMUM VOLTAGE RATING IN VOLTS125.0 AC AND 28.0 DC
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
2831164-18ITEM2Interchangeable
interchangeable cross-reference
interchangeable
M22885-9-02Interchangeable
interchangeable cross-reference
interchangeable
9-686Interchangeable
interchangeable cross-reference
interchangeable
10HF2Interchangeable
interchangeable cross-reference
interchangeable
5002743-019Interchangeable
interchangeable cross-reference
interchangeable
1HA9Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21ER3?
21ER3 is a SWITCH,SENSITIVE. It is classified as a MRO (MRO_GENERAL).
What parts can replace 21ER3?
There are 6 known substitutes for 21ER3: 2831164-18ITEM2, M22885-9-02, 9-686 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21ER3?
21ER3 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5930-00-034-0572. 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